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CN105976767A - Area source brightness uniformity adjusting method, device and system - Google Patents

Area source brightness uniformity adjusting method, device and system Download PDF

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Publication number
CN105976767A
CN105976767A CN201610490674.3A CN201610490674A CN105976767A CN 105976767 A CN105976767 A CN 105976767A CN 201610490674 A CN201610490674 A CN 201610490674A CN 105976767 A CN105976767 A CN 105976767A
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light source
surface light
image segmentation
image
segmentation block
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CN201610490674.3A
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CN105976767B (en
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杨艺
解三霞
周钟海
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Luster LightTech Co Ltd
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Luster LightTech Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Image Input (AREA)

Abstract

The embodiment of the invention discloses an area source brightness uniformity adjusting method, device and system, and the method comprises the steps: obtaining an image of a to-be-tested area source, segmenting the image, and forming at least one image segmented block, wherein the to-be-tested area source consists of at least one area source unit, and the image segmented block is corresponding to the area source unit; obtaining the gray value of the image segmented block; enabling the gray value to be put outside a standard gray value range, determining the image segmented block with the maximum difference between the gray value and a preset standard gray value as the target image segmented block, and adjusting the brightness of the area source unit corresponding to the target image segmented block. According to the embodiment of the invention, the method can automatically adjust the brightness uniformity of the area source, is convenient to operate, and reduces the errors.

Description

Surface light source brightness uniformity adjusting method, device and system
Technical Field
The invention relates to the technical field of brightness uniformity analysis, in particular to a method, a device and a system for adjusting brightness uniformity of a surface light source.
Background
In recent years, with the development of scientific technology, surface light sources are applied to various fields, such as the technical fields of illumination, display and the like, and especially in the display field, the uniformity of the brightness of the surface light source is a critical index for measuring the quality of display equipment, and more attention is paid to the surface light source.
Currently, the brightness uniformity of the surface light source is manually completed. The brightness value of each surface light source is measured at a plurality of positions on the surface light source surface by a luminance meter, whether the brightness values of the plurality of positions of the surface light source are within a specified reference range is determined, and whether the brightness of the surface light source is uniform is judged. If the brightness of the surface light source is not uniform, the brightness of the light source point corresponding to the position with non-uniform brightness is adjusted, and the adjustment of the brightness uniformity of the surface light source is realized. The manual operation method has low efficiency, inconvenient operation and larger error.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, an apparatus, and a system for adjusting luminance uniformity of a surface light source, which can automatically adjust luminance uniformity of the surface light source, are convenient to operate, and reduce errors.
In a first aspect, an embodiment of the present invention provides a method for adjusting luminance uniformity of a surface light source, including:
acquiring an image of a surface light source to be detected, and segmenting the image to form at least one image segmentation block; the surface light source to be detected is composed of at least one surface light source unit, and the image segmentation blocks correspond to the surface light source units;
acquiring a gray value of the image segmentation block;
and determining the image segmentation block with the gray value out of the standard gray range and the largest difference with the preset standard gray value as a target image segmentation block, and adjusting the brightness of the surface light source unit corresponding to the target image segmentation block.
In a second aspect, an embodiment of the present invention further provides a device for adjusting luminance uniformity of a surface light source, including:
the image segmentation block forming module is used for acquiring an image of a surface light source to be detected and segmenting the image to form at least one image segmentation block; the surface light source to be detected is composed of at least one surface light source unit, and the image segmentation blocks correspond to the surface light source units;
the image segmentation block gray value acquisition module is used for acquiring the gray value of the image segmentation block;
and the adjusting module is used for determining the image segmentation block with the gray value out of the standard gray range and the largest difference with the preset standard gray value as a target image segmentation block and adjusting the brightness of the surface light source unit corresponding to the target image segmentation block.
In a third aspect, an embodiment of the present invention further provides a system for adjusting luminance uniformity of a surface light source, including the device for adjusting luminance uniformity of a surface light source, where the device for adjusting luminance uniformity of a surface light source is disposed in a terminal, and the system further includes: the device comprises a surface light source tool to be detected, a light uniformizing device, a fixed support, a CCD camera and a feedback device;
the surface light source tool to be tested is used for bearing and fixing the surface light source to be tested;
the light homogenizing device is arranged on the surface light source to be measured and used for homogenizing the surface light source to be measured;
the fixed bracket is used for fixing the CCD camera;
the CCD camera is used for collecting the image of the surface light source to be detected and sending the image to the surface light source brightness uniformity adjusting device;
and the feedback device is used for controlling the current input to the surface light source unit corresponding to the brightness adjusting information according to the brightness adjusting information fed back by the surface light source brightness uniformity adjusting device.
According to the method, the device and the system for adjusting the brightness uniformity of the surface light source, provided by the embodiment of the invention, the acquired image of the surface light source to be measured is segmented to form the image segmentation blocks, and the brightness of the surface light source unit corresponding to the image segmentation block with the gray value outside the standard range and the largest difference with the preset standard gray value is adjusted, so that the operation is convenient, the error is reduced, and the brightness uniformity of the surface light source can be automatically adjusted.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a flow chart of a method for adjusting luminance uniformity of a surface light source according to a first embodiment of the present invention;
fig. 2 is a flowchart of a method for adjusting luminance uniformity of a surface light source according to a second embodiment of the present invention;
fig. 3 is a flowchart of a method for adjusting luminance uniformity of a surface light source according to a third embodiment of the present invention;
fig. 4 is a block diagram of a brightness uniformity adjusting device of a surface light source according to a fourth embodiment of the present invention;
fig. 5 is a structural diagram of a brightness uniformity adjusting system of a surface light source according to a fifth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
Example one
Fig. 1 is a flowchart of a method for adjusting luminance uniformity of a surface light source according to an embodiment of the present invention, where the method is performed by a device for adjusting luminance uniformity of a surface light source, the device is performed by software and/or hardware, and the device is generally configured in a terminal, as shown in fig. 1, and the technical solution provided in this embodiment is specifically as follows:
s110: the method comprises the steps of obtaining an image of a surface light source to be detected, and dividing the image to form at least one image dividing block.
In this embodiment, the area light source to be measured is composed of at least one area light source unit, and each area light source unit is independent from each other and can be controlled independently. Alternatively, the luminance of the surface light source unit may be controlled by controlling the current input to the surface light source unit.
In this embodiment, optionally, the surface light source to be measured is an LED surface light source. The LED surface light source comprises at least one surface light source unit, wherein the surface light source unit is composed of at least one LED lamp. When the surface light source unit includes a plurality of LED lamps, the shape of the surface light source unit may be selected to be rectangular, triangular, circular, etc., and the shape of the surface light source unit may also be other shapes. If the surface light source unit has a rectangular shape, a plurality of LED lamps are arranged in a matrix. The LED lamps of each row or each column are connected in series, and the LED lamps between rows or between columns are connected in parallel. The problem that the whole surface light source unit is damaged due to the damage of one LED lamp is solved through the connection mode.
The shape of the LED surface light source is not limited, and when the LED surface light source includes a plurality of surface light source units and the surface light source to be measured is rectangular, the surface light source units are arranged in a matrix.
In this embodiment, when acquiring an image of a surface light source to be measured, it is necessary to fix the surface light source to be measured to a surface light source tool, fix the surface light source to be measured, and input a current to the surface light source to be measured, so that the surface light source to be measured is lit. When the surface light source to be detected is lightened, the CCD camera is used for acquiring an image of the surface light source to be detected, and the image is divided to form an image dividing block. The image division blocks correspond to the surface light source units, and the number of the image division blocks is the same as that of the surface light source units.
In this embodiment, the correspondence between the image segmentation blocks and the surface light source unit may be a manner of corresponding the position coordinates of the image segmentation blocks in the obtained surface light source image to be measured with the position coordinates of the surface light source unit in the surface light source to be measured, and forming a mapping table. The position coordinates of the image segmentation blocks in the obtained surface light source image to be detected are determined based on a coordinate system established in the obtained surface light source image to be detected, and the position coordinates of the surface light source unit in the surface light source to be detected are determined based on the coordinate system established in the surface light source to be detected. When the position coordinates of the image segmentation blocks in the acquired surface light source image to be detected are determined, the position coordinates of the corresponding surface light source unit can be determined by inquiring the mapping table. The image division block may be associated with the surface light source unit in another manner. When the image segmentation blocks are arranged in the matrix mode in the obtained surface light source image to be detected and the surface light source units are arranged in the matrix mode in the surface light source to be detected, the matrix coordinates of the image segmentation blocks can be corresponding to the matrix coordinates of the surface light source units.
S120: and acquiring the gray value of the image segmentation block.
In this embodiment, the gray values of the image segmentation blocks can be obtained by summing the gray values of all the pixel points in the image segmentation blocks, and then solving the average value of the gray values of all the pixel points; or summing up the gray values of the pixel points with the preset number in the image segmentation block, and then obtaining the average value of the gray values of the pixel points with the preset number. Wherein the preset number is determined according to actual needs.
In this embodiment, the gray scale values of the image segmentation blocks may be calculated in other manners, and are not limited to the above manners. For example, according to factors such as the positions of the pixel points in the image segmentation block, weight values are given to a preset number of pixel points in the image segmentation block, and the gray value of the image segmentation block is obtained based on the weight values and the gray value of the pixel points, and the specific method is as follows: and summing products of the weighted values and the gray values of the preset number of pixel points to obtain the gray value of the image segmentation block.
S130: and determining the image segmentation block with the gray value out of the standard gray range and the largest difference with the preset standard gray value as a target image segmentation block, and adjusting the brightness of the surface light source unit corresponding to the target image segmentation block.
In the embodiment, the standard gray scale range is determined by a preset standard gray scale value and an error range. Optionally, in this embodiment, the preset standard gray scale value is 100, the error range is [ -5%, 5% ], that is, the standard gray scale range is [95,105 ]. The standard gray scale range and the preset standard gray scale value can be set according to needs.
In this embodiment, when the grayscale value of a target image segment is less than the minimum value in the standard grayscale range, the luminance of the surface light source unit corresponding to the target image segment is increased; and when the gray value of the target image segmentation block is larger than the maximum value in the standard gray range, reducing the brightness of the surface light source unit corresponding to the target image segmentation block. The adjusting of the brightness of the surface light source unit corresponding to the target image segmentation block may be implemented by adjusting a current input to the surface light source unit, or may be implemented in other manners. Because the brightness of each surface light source unit is influenced by the brightness of other surface light source units, the brightness of the surface light source unit corresponding to the target image segmentation block with the gray value out of the standard range and the largest difference with the preset standard value is adjusted, the situation that the error is large due to simultaneous adjustment of a plurality of surface light source units is avoided, and the operation is convenient.
The embodiment provides a method for adjusting brightness uniformity of a surface light source, which includes segmenting an acquired image of the surface light source to be measured to form image segmentation blocks, adjusting the brightness of a surface light source unit corresponding to the image segmentation block with a gray value out of a standard range and a maximum difference with a preset standard gray value, and is convenient to operate, capable of reducing errors and capable of automatically adjusting the brightness uniformity of the surface light source.
Example two
Fig. 2 is a flowchart of a method for adjusting luminance uniformity of a surface light source according to a second embodiment of the present invention, and on the basis of the above embodiment, optionally, after the adjusting the luminance of the surface light source unit corresponding to the target image splitting block, the method further includes: detecting whether the gray value of each image segmentation block is in a standard gray range or not;
if yes, ending the process; and if not, returning to the operation of acquiring the image of the surface light source to be detected.
Therefore, the uniformity of the brightness of the surface light source is improved by returning to the operation of acquiring the image of the surface light source to be measured.
Further, optionally, the obtaining the gray-scale value of the image segmentation block includes:
acquiring the gray value of at least one pixel point in the image segmentation block;
and determining the gray value of the image segmentation block based on the gray value of the pixel point.
Therefore, the gray value of the image segmentation block is determined based on the gray value of the pixel point in the image segmentation block, so that the gray value of the image segmentation block can be accurately obtained, and the error of adjusting the brightness of the surface light source unit corresponding to the target image segmentation block is reduced.
Further, optionally, determining an image segmentation block, of which a gray value is outside a standard gray range and which has a maximum difference with a preset standard gray value, as a target image segmentation block, and adjusting the brightness of the surface light source unit corresponding to the target image segmentation block, includes:
identifying at least one image segmentation block with the gray value outside the standard gray range;
selecting the image segmentation block with the largest difference with a preset standard gray value from the identified image segmentation blocks as a target image segmentation block, and determining the position of the target image segmentation block;
and adjusting the current value input to the surface light source unit corresponding to the target image segmentation block based on the preset corresponding relation between the gray value of the image segmentation block and the current value input to the surface light source unit.
Therefore, the image segmentation blocks with the gray values outside the standard gray range are identified, so that the target image segmentation block with the largest difference with the preset standard gray value is conveniently selected from the identified image segmentation blocks; by adjusting the current value of the surface light source unit corresponding to the target image division block, the luminance of the surface light source unit corresponding to the target image division block can be accurately adjusted.
Based on the above optimization, as shown in fig. 2, the technical solution provided in this embodiment is specifically as follows:
s210: the method comprises the steps of obtaining an image of a surface light source to be detected, and dividing the image to form at least one image dividing block.
S220: and acquiring the gray value of at least one pixel point in the image segmentation block.
In this embodiment, the image partition block includes at least one pixel, and when the gray value of the pixel in the image partition block is obtained, the gray values of all the pixels are obtained, or only the gray values of a preset number of pixels may be obtained.
S230: and determining the gray value of the image segmentation block based on the gray value of the pixel point.
In this embodiment, optionally, the determining the gray value of the image segmentation block based on the gray value of the pixel point includes: calculating a gray value of the image segmentation block based on the following formula:wherein, L (x, y) is the gray value of the image segmentation block with the position coordinate of (x, y) in the obtained image of the surface light source to be detected; m is the number of pixel points along the X axis in the image segmentation block; n is the number of pixel points along the y axis in the image segmentation block; m is greater than, less than or equal to N;
and L (i, j) is the gray value of the pixel point with the position coordinate (i, j) in the image segmentation block. Thereby, the formula for calculating the gray value of the image segmentation blockIt can be known that the gray value of the image segmentation block is an average value of the gray levels of all the pixels in the image segmentation block.
It should be noted that, in this embodiment, the image segmentation blocks are exemplarily expressed in the position coordinates in the obtained surface light source image to be measured, but the present invention is only an example, and in other embodiments of the present invention, because the image segmentation blocks may be arranged in a matrix manner in the obtained surface light source image to be measured, the positions of the image segmentation blocks may be expressed in a matrix coordinates manner. Similarly, the positions of the pixels can also be expressed in the form of matrix coordinates. For example, the positions of the image segmentation blocks can be expressed as a [ x, y ], a represents an image segmentation block matrix in the acquired image of the surface light source to be measured, x represents the x-th row of the image segmentation block matrix, and y represents the y-th column of the image segmentation block matrix. The positions of the pixel points can be expressed as B [ i, j ], wherein B represents a pixel point matrix in the image segmentation block, i represents the ith row in the pixel point matrix, and j represents the jth column in the pixel point matrix.
S240: and identifying at least one image segmentation block with the gray value outside the standard gray range.
In this embodiment, there are one or more image segments whose grayscale values are outside the standard grayscale range, and these image segments are identified. The method for identifying the image segmentation blocks may be to identify positions of the image segmentation blocks in the obtained surface light source image to be detected, or to identify gray values of the image segmentation blocks, or to identify other parameters of the image segmentation blocks, and the identification may be in the form of red marking, highlight marking, or the like. The form of the marker is not limited, and is selected according to the parameters of the marked image segmentation block.
S250: and selecting the image segmentation block with the largest difference with a preset standard gray value from the identified image segmentation blocks as a target image segmentation block, and determining the position of the target image segmentation block.
In the present embodiment, determining the position of the target image segment refers to determining the position coordinates of the target image segment, and after determining the position of the target image segment, the position of the surface light source unit corresponding to the target image segment can be determined so as to adjust the brightness of the surface light source unit.
S260: and adjusting the current value input to the surface light source unit corresponding to the target image segmentation block based on the preset corresponding relation between the gray value of the image segmentation block and the current value input to the surface light source unit.
In this embodiment, the preset correspondence between the gradation value of the image division block and the current value input to the surface light source unit is expressed by the following formula:wherein L is a gray value of any one of the image segments, I is a current value input to the surface light source unit corresponding to the image segment, and a is a predetermined coefficient. In this embodiment, optionally, a is 100, and a may also be another value, and the value of a is for the purpose of conveniently calculating the current value of the corresponding surface light source unit according to the gray value of the image partition block. When a is 100, the gray scale value of the image segmentation block is between 0 and 255, so that the gray scale value is calculated by the formulaThe calculated current value inputted to the surface light source unit is between 0A and 2.55A.
In this embodiment, optionally, the adjusting is performed on the surface corresponding to the target image partition block based on a preset corresponding relationship between the gray value of the image partition block and the current value input to the surface light source unitA current value of the light source unit, comprising: calculating a target current value input to the surface light source unit corresponding to the target image division block by the following formula:orWherein, ItThe target current value is input to the surface light source unit corresponding to the target image segmentation block; i is0The preset standard current value is determined by the preset standard gray value and the preset corresponding relation between the gray value of the image segmentation block and the current value input to the surface light source unit; l issAnd segmenting the current gray value of the block for the target image. Wherein when the gray value of the target image segmentation block is larger than the maximum value (105) in the standard gray range, a formula is adoptedAnd calculating a target current value input to the surface light source unit corresponding to the target image segmentation block. When the gray value of the target image segmentation block is smaller than the minimum value in the standard gray range, adopting a formulaAnd calculating a target current value input to the surface light source unit corresponding to the target image segmentation block.
In this embodiment, optionally, the preset standard gray-scale value is 100, and the value of a is 100, according to the above descriptionThe preset standard current value can be calculated to be 1A. Wherein,the current gray value of the image block of the characterization target is LsThen, the current value of the surface light source unit corresponding to the target image division block is input.
And S270, detecting whether the gray value of each image segmentation block is in a standard gray range.
If yes, go to step S280, if no, return to step S210.
And S280, ending the process.
In this embodiment, after the target current value of the surface light source unit corresponding to the target image segmentation block is input, the process returns to S210 to determine the gray value of each image segmentation block, if the gray value of each image segmentation block is within the standard gray range, the process is ended, otherwise, the process returns to S210.
The embodiment provides a method for adjusting the brightness uniformity of a surface light source, which improves the brightness uniformity of the surface light source by returning to the operation of obtaining an image of the surface light source to be detected; the gray value of the image segmentation block is determined based on the gray value of the pixel point in the image segmentation block, so that the gray value of the image segmentation block can be accurately obtained, and the error of adjusting the brightness of the surface light source unit corresponding to the image segmentation block is reduced; by identifying the image segmentation blocks with the gray values outside the standard gray range, the target image segmentation block with the largest difference with the preset standard gray value is conveniently selected from the identified image segmentation blocks; by adjusting the current value of the surface light source unit corresponding to the target image division block, the luminance of the surface light source unit corresponding to the target image division block can be accurately adjusted.
EXAMPLE III
Fig. 3 is a flowchart of a luminance uniformity adjusting method for a surface light source provided in a third embodiment of the present invention, and on the basis of the third embodiment, optionally, the surface light source to be measured includes 4 surface light source units.
As shown in fig. 3, the technical solution provided in this embodiment is as follows:
s310: acquiring an image of a surface light source to be detected, and dividing the image to form 4 image dividing blocks.
S320: and acquiring the gray values of 25 pixel points in each image segmentation block.
In this embodiment, table 1 is a gray scale information table of pixels in each image partition, and as shown in table 1, the number of pixels along the X axis of each image partition is 5, and the number of pixels along the Y axis of each image partition is also 5, that is, each image partition has 25 pixels. In the acquired image of the surface light source to be measured, the position coordinates of the 4 image segmentation blocks are respectively (1,1), (1,2), (2,1) and (2, 2).
TABLE 1
S330: and determining the gray value of each image segmentation block based on the gray value of the pixel point.
In the present embodiment, the image segmentation block gradation values whose position coordinates are (1,1), (1,2), (2,1), and (2,2), respectively, are calculated based on the following formula:wherein, L (x, y) is the gray value of the image segmentation block with the position coordinate of (x, y) in the obtained image of the surface light source to be detected; m is the number of pixel points along the X axis in the image segmentation block; n is the number of pixel points along the y axis in the image segmentation block; m is greater than, less than or equal to N; and L (i, j) is the gray value of the pixel point with the position coordinate (i, j) in the image segmentation block. The calculated gray values of the image segments with the position coordinates of (1,1), (1,2), (2,1) and (2,2) are as follows:
L ( 1 , 1 ) = Σ i = 1 , j = 1 i = 5 , j = 5 L ( i , j ) 5 × 5 = 98.4 ; L ( 1 , 2 ) = Σ i = 1 , j = 1 i = 5 , j = 5 L ( i , j ) 5 × 5 = 108.4 ;
L ( 2 , 1 ) = Σ i = 1 , j = 1 i = 5 , j = 5 L ( i , j ) 5 × 5 = 93.4 ; L ( 2 , 2 ) = Σ i = 1 , j = 1 i = 5 , j = 5 L ( i , j ) 5 × 5 = 98.4.
in this embodiment, when calculating the luminance value of each image segment, the position coordinates of each pixel in the image segment are determined by the coordinate system established in the image segment.
In table 1, the present invention exemplarily expresses the position of each image segment by using the position coordinates, but in the embodiment of the present invention, the position of each image segment may be expressed by using the matrix coordinates. In each image segmentation block, the position of each pixel point in the image segmentation block can also be expressed in a matrix coordinate mode.
S340: and identifying at least one image segmentation block with the gray value outside the standard gray range.
In this embodiment, the standard gray scale range is [95,100], and in the gray scale values of the image segmentation blocks calculated above, 108.4 and 93.4 are both out of the standard gray scale range, the position coordinates of the image segmentation blocks corresponding to 108.4 and 93.4 may be identified, or 108.4 and 93.4 may also be identified.
S350: and selecting the image segmentation block with the largest difference with a preset standard gray value from the identified image segmentation blocks as a target image segmentation block, and determining the position of the target image segmentation block.
In this embodiment, the preset standard gray value is 100, and the image segmentation block with the largest difference between the gray value and 100 is selected as the target image segmentation block. The difference between 108.4 and 100 is the largest, so the image segmentation block with the gray value of 108.4 is the target image segmentation block, the position coordinates of the target image segmentation block in the acquired image of the surface light source to be detected are (1,2), and after the position coordinates of the target segmentation block are determined, the position of the corresponding surface light source unit can be further determined according to the corresponding relation between the target segmentation block and the surface light source unit.
S360: and adjusting the current value input to the surface light source unit corresponding to the target image segmentation block based on the preset corresponding relation between the gray value of the image segmentation block and the current value input to the surface light source unit.
Specifically, the target current value input to the area light source unit corresponding to the target image division block is calculated by the following formula:orWherein, ItThe target current value is input to the surface light source unit corresponding to the target image segmentation block; i is0The preset standard current value is determined by the preset standard gray value and the preset corresponding relation between the gray value of the image segmentation block and the current value input to the surface light source unit; l issAnd segmenting the current gray value of the block for the target image. Since the gray value of the image segment with the position coordinates of (1,2) is 108.4 and is larger than the maximum value (105) in the standard gray range, the formula is adoptedA target current value input to the corresponding surface light source unit is calculated. The target current value input to the corresponding surface light source unit is: I t = I 0 - | L s a - I 0 | = 1 - | 108.4 100 - 1 | = 0.916 A .
s370: and detecting whether the gray values of the 4 image segmentation blocks are all in a standard gray range.
If yes, go to S380, if no, return to S310.
In this embodiment, table 2 is a gray scale information table of pixel points in each image segment after adjusting the current input to the surface light source unit corresponding to the image segment with position coordinates (1, 2). After adjusting the current input to the surface light source unit corresponding to the image partition block with the position coordinate of (1,2), the gray scale value of each image partition block is calculated as follows:
in the embodiment, whether the gray values of the 4 image segmentation blocks are within the standard gray range or not is detected, wherein the gray value of the image segmentation block with the adjusted position coordinates of (1,2) is 99.5; 99.5 are already within the standard gray scale range, meeting the brightness uniformity standard. However, 93.4 is out of the standard gray scale range and has the largest difference with the preset standard gray scale value (100), so that the current of the surface light source unit corresponding to the image segmentation block of the position coordinate (2,1) needs to be adjusted.
TABLE 2
In the present embodiment, since 93.4 is smaller than the minimum value (95) in the standard gradation range, it is calculated according to the formulaCalculating a target current value input to a cell of the surface light source corresponding to the image division block having the position coordinate of (2,1), the target current value being:
in this embodiment, after the current value (1.066A) corresponding to the image partition having the position coordinate of (2,1) is input, the process returns to S310, and the grayscale information of each pixel point in each image partition is acquired. Table 3 is a gray scale information table of pixel points in each image segment after adjusting the current input to the surface light source unit corresponding to the image segment having the position coordinate of (2, 1). From the gray scale information shown in table 3, the gray scale values of the respective image segments are calculated as follows:
TABLE 3
After the current (1.066A) input to the surface light source unit corresponding to the image partition with the position coordinate of (2,1) is adjusted, the gray value of the image partition with the position coordinate of (2,1) is 99.5, and 99.5 is within the standard gray range. And the gray values of other image segmentation blocks are all in the standard gray range, so the gray values of all the image segmentation blocks meet the uniformity requirement.
S380: and ending the flow.
It is noted that, as is clear from the gradation information in tables 1,2, and 3 in the present embodiment, the adjusted luminance of the surface light source unit corresponding to the target image segment does not affect the luminance of the other surface light source units. However, in other embodiments of the present invention, the adjusted luminance of the surface light source unit corresponding to the target image segment may affect the luminance of other surface light source units.
The embodiment provides a method for adjusting brightness uniformity of a surface light source, which divides an acquired image of the surface light source to be measured into image division blocks by preferentially selecting 4 surface light source units as the surface light source to be measured, and adjusts the brightness of the surface light source unit corresponding to the image division block with the gray value outside a standard range and the difference with a preset standard gray value being the largest.
Example four
Fig. 4 is a block diagram of a luminance uniformity adjusting apparatus of a surface light source, which executes a luminance uniformity adjusting method of a surface light source according to a fourth embodiment of the present invention, and as shown in fig. 4, the apparatus includes an image division block forming module 410, an image division block gray value obtaining module 420, and an adjusting module 430.
The image segmentation block forming module 410 is configured to obtain an image of a surface light source to be detected, and segment the image to form at least one image segmentation block; the surface light source to be detected is composed of a plurality of surface light source units, and the image segmentation blocks correspond to the surface light source units;
an image segmentation block gray value obtaining module 420, configured to obtain a gray value of the image segmentation block;
and the adjusting module 430 is configured to determine the image segmentation block with the gray value outside the standard gray range and the largest difference with the preset standard gray value as a target image segmentation block, and adjust the brightness of the surface light source unit corresponding to the target image segmentation block.
Further, the apparatus further includes a returning module 440, configured to return to the operation of acquiring the image of the surface light source to be measured after the brightness of the surface light source unit corresponding to the target image partition block is adjusted, until the grayscale value of each image partition block is within the standard grayscale range.
Further, the image segmentation block gray value obtaining module 420 is specifically configured to:
acquiring the gray value of at least one pixel point in the image segmentation block;
and determining the gray value of the image segmentation block based on the gray value of the pixel point.
Further, the determining the gray value of the image segmentation block based on the gray value of the pixel point includes:
calculating a gray value of the image segmentation block based on the following formula:
the method comprises the following steps that L (X, y) is a gray value of an image segmentation block with position coordinates (X, y) in an obtained image of a surface light source to be detected, and M is the number of pixel points along an X axis in the image segmentation block; n is the number of pixel points along the y axis in the image segmentation block; m is greater than, less than or equal to N; and L (i, j) is the gray value of the pixel point with the position coordinate (i, j) in the image segmentation block.
Further, the adjusting module 430 is specifically configured to:
identifying at least one image segmentation block with the gray value outside the standard gray range;
selecting the image segmentation block with the largest difference with a preset standard gray value from the identified image segmentation blocks as a target image segmentation block, and determining the position of the target image segmentation block;
and adjusting the current value input to the surface light source unit corresponding to the target image segmentation block based on the preset corresponding relation between the gray value of the image segmentation block and the current value input to the surface light source unit.
Further, the gray value of the image segmentation block is input toThe preset corresponding relation between the current values of the surface light source units is expressed by the following formula:wherein L is a gray value of any one of the image segments, I is a current value input to the surface light source unit corresponding to the image segment, and a is a predetermined coefficient.
Further, the adjusting the current value input to the surface light source unit corresponding to the target image division block based on the preset correspondence between the gradation value of the image division block and the current value input to the surface light source unit includes:
calculating a target current value input to the surface light source unit corresponding to the target image division block by the following formula:or
Wherein, ItThe target current value is input to the surface light source unit corresponding to the target image segmentation block; i is0The preset standard current value is determined by the preset standard gray value and a preset corresponding relation between the gray value of the image segmentation block and the current value input to the surface light source unit; l issAnd segmenting the current gray value of the block for the target image.
Further, the preset coefficient a is 100.
The embodiment provides a surface light source brightness uniformity adjusting device, through the image segmentation of the surface light source that awaits measuring that will acquire, forms the image segmentation piece to adjust the luminance of the surface light source unit that the grey level value is outside the standard range and corresponds with the image segmentation piece that predetermines the standard grey level value and differ the biggest, convenient operation reduces the error, can the brightness uniformity of automatically regulated surface light source.
EXAMPLE five
Fig. 5 is a structural diagram of a surface light source brightness uniformity adjusting system provided in the fifth embodiment of the present invention, and as shown in fig. 5, the system includes a surface light source brightness uniformity adjusting device 510, the surface light source brightness uniformity adjusting device is disposed in a terminal 520, and the system further includes: the device comprises a surface light source tool to be measured 530, a light uniformizing device 540, a fixing bracket (not shown), a CCD camera 550 and a feedback device 560. The terminal can be a computer, a smart phone, and the like.
The surface light source tool 530 to be tested is used for bearing and fixing the surface light source 570 to be tested;
the light homogenizing device 540 is arranged on the surface light source 570 to be measured and is used for homogenizing the surface light source 570 to be measured;
a fixing bracket for fixing the CCD camera 550;
the CCD camera 550 is used for collecting an image of the surface light source 570 to be measured and sending the image to the surface light source brightness uniformity adjusting device 510;
and a feedback unit 560 for controlling the current inputted to the surface light source unit corresponding to the brightness adjustment information according to the brightness adjustment information fed back by the surface light source brightness uniformity adjusting unit 510. In this embodiment, optionally, the luminance adjustment information fed back by the surface light source uniformity adjusting device 510 is a current value of the surface light source unit corresponding to the image partition block, the surface light source uniformity adjusting device 510 feeds back the current value of the surface light source unit corresponding to the image partition block to the feedback device 560 as a signal in a preset format, and the feedback device 560 analyzes the signal fed back by the surface light source uniformity adjusting device 510 and controls the current input to the surface light source unit corresponding to the image partition block.
On the basis of the above embodiment, the feedback device 560 is a single chip microcomputer; the light uniformizing device 540 is a subgrid plate. Wherein the light homogenizing device can also be other components with the light homogenizing function.
On the basis of the above embodiment, the terminal 520 and the feedback device 560 communicate in a serial port, a network port, a wireless manner, and the like, and the terminal and the feedback device may also use other communication manners.
The embodiment provides a surface light source brightness uniformity adjusting system, gather the image of the area light source that awaits measuring through the CCD camera, carry out the automatically regulated through area light source brightness uniformity adjusting device according to the image of the light source that awaits measuring that obtains to the area light source unit in the area light source that awaits measuring, analyze the luminance information of area light source brightness uniformity adjusting device feedback through feedback device to the electric current of control input to area light source unit, convenient operation has reduced the error.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (18)

1. A method for adjusting the brightness uniformity of a surface light source is characterized by comprising the following steps:
acquiring an image of a surface light source to be detected, and segmenting the image to form at least one image segmentation block; the surface light source to be detected is composed of at least one surface light source unit, and the image segmentation blocks correspond to the surface light source units;
acquiring a gray value of the image segmentation block;
and determining the image segmentation block with the gray value out of the standard gray range and the largest difference with the preset standard gray value as a target image segmentation block, and adjusting the brightness of the surface light source unit corresponding to the target image segmentation block.
2. The method according to claim 1, further comprising, after the adjusting the luminance of the surface light source unit corresponding to the target image segment: and returning to the operation of obtaining the image of the surface light source to be detected until the gray value of each image segmentation block is within the standard gray range.
3. The method of claim 1, wherein the obtaining gray-scale values of the image segments comprises:
acquiring the gray value of at least one pixel point in the image segmentation block;
and determining the gray value of the image segmentation block based on the gray value of the pixel point.
4. The method of claim 3, wherein determining the gray value of the image partition based on the gray values of the pixels comprises:
calculating a gray value of the image segmentation block based on the following formula:
wherein, L (x, y) is the gray value of the image segmentation block with the position coordinate of (x, y) in the obtained image of the surface light source to be detected; m is the number of pixel points along the X axis in the image segmentation block; n is the number of pixel points along the y axis in the image segmentation block; m is greater than, less than or equal to N; and L (i, j) is the gray value of the pixel point with the position coordinate (i, j) in the image segmentation block.
5. The method according to claim 1, wherein an image partition having a gray value outside a standard gray range and a maximum difference from a preset standard gray value is determined as a target image partition, and adjusting the brightness of a surface light source unit corresponding to the target image partition comprises:
identifying at least one image segmentation block with the gray value outside the standard gray range;
selecting the image segmentation block with the largest difference with a preset standard gray value from the identified image segmentation blocks as a target image segmentation block, and determining the position of the target image segmentation block;
and adjusting the current value input to the surface light source unit corresponding to the target image segmentation block based on the preset corresponding relation between the gray value of the image segmentation block and the current value input to the surface light source unit.
6. The method according to claim 5, wherein the preset correspondence between the gradation value of the image division block and the current value input to the surface light source unit is expressed by the following formula:wherein L is a gray value of any one of the image segments, I is a current value input to the surface light source unit corresponding to the image segment, and a is a predetermined coefficient.
7. The method according to claim 6, wherein the adjusting the current value input to the surface light source unit corresponding to the target image division block based on the preset correspondence between the gradation value of the image division block and the current value input to the surface light source unit comprises:
calculating a target current value input to the surface light source unit corresponding to the target image division block by the following formula:or
Wherein, ItThe target current value is input to the surface light source unit corresponding to the target image segmentation block; i is0The preset standard current value is determined by the preset standard gray value and the preset corresponding relation between the gray value of the image segmentation block and the current value input to the surface light source unit; l issAnd segmenting the current gray value of the block for the target image.
8. Method according to claim 6 or 7, characterized in that the predetermined factor a is 100.
9. A luminance uniformity adjusting apparatus of a surface light source, comprising:
the image segmentation block forming module is used for acquiring an image of a surface light source to be detected and segmenting the image to form at least one image segmentation block; the surface light source to be detected is composed of at least one surface light source unit, and the image segmentation blocks correspond to the surface light source units;
the image segmentation block gray value acquisition module is used for acquiring the gray value of the image segmentation block;
and the adjusting module is used for determining the image segmentation block with the gray value out of the standard gray range and the largest difference with the preset standard gray value as a target image segmentation block and adjusting the brightness of the surface light source unit corresponding to the target image segmentation block.
10. The apparatus according to claim 9, further comprising a returning module, configured to return to the operation of obtaining the image of the surface light source to be measured after the adjusting of the brightness of the surface light source unit corresponding to the target image partition block until the grayscale value of each image partition block is within the standard grayscale range.
11. The apparatus according to claim 9, wherein the image segmentation block gray value obtaining module is specifically configured to:
acquiring the gray value of at least one pixel point in the image segmentation block;
and determining the gray value of the image segmentation block based on the gray value of the pixel point.
12. The apparatus of claim 11, wherein the determining the gray-level value of the image partition based on the gray-level value of the pixel point comprises:
calculating a gray value of the image segmentation block based on the following formula:the method comprises the following steps that L (X, y) is a gray value of an image segmentation block with position coordinates (X, y) in an obtained image of a surface light source to be detected, and M is the number of pixel points along an X axis in the image segmentation block; n is the number of pixel points along the y axis in the image segmentation block; m is greater than, less than or equal to N; and L (i, j) is the gray value of the pixel point with the position coordinate (i, j) in the image segmentation block.
13. The device according to claim 9, wherein the adjustment module is specifically configured to:
identifying at least one image segmentation block with the gray value outside the standard gray range;
selecting the image segmentation block with the largest difference with a preset standard gray value from the identified image segmentation blocks as a target image segmentation block, and determining the position of the target image segmentation block;
and adjusting the current value input to the surface light source unit corresponding to the target image segmentation block based on the preset corresponding relation between the gray value of the image segmentation block and the current value input to the surface light source unit.
14. The apparatus of claim 13, wherein the preset correspondence between the gradation value of the image division block and the current value input to the surface light source unit is expressed by the following formula:wherein L is a gray value of any one of the image segments, I is a current value input to the surface light source unit corresponding to the image segment, and a is a predetermined coefficient.
15. The apparatus according to claim 14, wherein the adjusting of the current value input to the surface light source unit corresponding to the target image division block based on the preset correspondence between the gradation value of the image division block and the current value input to the surface light source unit comprises:
calculating a target current value input to the surface light source unit corresponding to the target image division block by the following formula:or
Wherein, ItThe target current value is input to the surface light source unit corresponding to the target image segmentation block; i is0The preset standard current value is determined by the preset standard gray value and a preset corresponding relation between the gray value of the image segmentation block and the current value input to the surface light source unit; l issAnd segmenting the current gray value of the block for the target image.
16. Device according to claim 14 or 15, characterized in that the predetermined factor a is 100.
17. A surface light source luminance uniformity adjusting system comprising the surface light source luminance uniformity adjusting device as set forth in any one of claims 9 to 16, the surface light source luminance uniformity adjusting device being disposed in a terminal, the system further comprising: the device comprises a surface light source tool to be detected, a light uniformizing device, a fixed support, a CCD camera and a feedback device;
the surface light source tool to be tested is used for bearing and fixing the surface light source to be tested;
the light homogenizing device is arranged on the surface light source to be measured and used for homogenizing the surface light source to be measured;
the fixed bracket is used for fixing the CCD camera;
the CCD camera is used for collecting the image of the surface light source to be detected and sending the image to the surface light source brightness uniformity adjusting device;
and the feedback device is used for controlling the current input to the surface light source unit corresponding to the brightness adjusting information according to the brightness adjusting information fed back by the surface light source brightness uniformity adjusting device.
18. The system of claim 17, wherein the feedback device is a single-chip microcomputer; the light uniformizing device is a subgrid plate.
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