CN104020565A - Display system with optical lens and display screen and image display method thereof - Google Patents
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Abstract
The invention discloses a display system with an optical lens and display screen and an image display method of the display system. The image display method comprises the following steps that first, the optical lens is reversed in a virtual mode according to the optical parameters of the optical lens to obtain a virtual reversed lens, the objective image of the reversed lens is reversed to the objective image of the optical lens; second, the distortion coefficients of the three color components of RGB are calculated according to the optical parameters of the reverted lens after the color components pass through the reverted lens, and serve as a1, a2 and a3 respectively; third, pixel points of a predictive display image are amplified a1 times, a2 times and a3 times respectively, so that the three RGB color components of each pixel point is obtained to form a compensatory image after the pixel point is distorted, and a compensatory image is formed; fourth, after the compensatory image is output to the display screen and displayed, the compensatory image is displayed as a normal image through the optical lens. According to the display system with the optical lens and the display screen and the image display method of the display system, the problem that blur or ghosting or distortion of an image may happen is solved, and an algorithm can be carried out fast and conveniently.
Description
Technical field
The invention belongs to technical field of image processing, specifically, relate to a kind of display system and method for displaying image thereof with optical lens and display screen.
Background technology
Head-mounted display (HMD), as emerging technology in recent years, is a kind of image amplifying on ultra micro display screen, and image projection, on user's retina, and then is presented in to large-screen image in beholder's eye.Head-mounted display has a wide range of applications in many-sides such as industry, military affairs, literature and art, amusements at present.
Fig. 1 is the light path schematic diagram of current head-mounted display, and as shown in Fig. 1, wherein, human eye 100 sees through eyepiece 102 can watch the image being imaged in board-type flat-panel screens 101.Because light is after the refraction of eyepiece 102, can produce certain distortion, as shown in Figure 2 and Figure 3, wherein, Fig. 2 is the image that display normally shows output, and Fig. 3 is fed into the fault image presenting in human eye after eyepiece 102, and the distortion of projected image not only can affect the comfort of observation, even can cause the erroneous judgement of user to important information, cause unnecessary loss.
In addition, because the wavelength of three primary colors RGB is different, refraction angle through eyepiece 102 is also different, shown in Figure 4, be projected in human eye, be presented as that three kinds of color images do not overlap mutually, can cause the visual effect of fuzzy or ghost image, can impact equally comfort and the erroneous judgement of user to information of observation.
Summary of the invention
There is the problem of distortion and image blurring or ghost image in the present invention, provides one to have optical lens and display image display packing in order to solve the visual effect of existing head-mounted display, can overcome the problems referred to above.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A method for displaying image with optical lens and display screen, comprises the following steps:
(1), according to the optical parametric of the described optical lens described optical lens that reverses virtually, obtain virtual reversion lens, the image of described reversion lens and the image of described optical lens reverse;
(2), according to reversion lens optical parametric calculate respectively the distortion factor of tri-kinds of color components of RGB after described reversion lens, be a1, a2, a3;
(3), show by one that in advance the each pixel of image amplifies respectively a1, a2, a3 processing doubly, obtains the tri-kinds of color components of RGB after described each pixel distorts, formation compensating images;
(4), described compensating images exports to after described demonstration screen display, is shown as normal picture through described optical lens.
Further, in described step (2), the computing method of distortion factor are:
Set up an image object plane coordinate system before reversion lens, wherein, the image height of pixel (x1, y1) in object plane coordinate system
lfor this pixel is to the distance of coordinate system central point
;
The image height that obtains the RGB tri-kind color components of this pixel after reversion lens is respectively L, L ', L 〞;
The distortion factor of tri-kinds of color components of RGB after described reversion lens is:
R:
；
G:
；
B:
。
Further again, in described step (2), the distortion factor difference of different pixels point, described a1, a2, a3 are constant array.
Further again, obtain the image height L of pixel (x1, y1) through the tri-kinds of color components of RGB after lens that reverse, L ', the step of L 〞 comprises:
Simulate the image corresponding relation of described reversion lens according to the optical parametric of described reversion lens;
According to the former image height of tri-kinds of color components of described corresponding relation output RGB in object plane coordinate system and the new image height after reversion lens;
According to the former image height of tri-kinds of color components of RGB
l 0with new image height L
0, L
0', L
0〞 simulates the new image height of tri-kinds of color components of RGB about the funtcional relationship of former image height, i.e. before tri-kinds of color components of RGB distortion with distortion after the funtcional relationship of image height
R:
；
G:
；
B:
；
According to the former image height in the object plane coordinate system of described pixel (x1, y1)
, and described funtcional relationship, the tri-kinds of color components of RGB that obtain this pixel are respectively L=through the new image height reversing after lens
f(
l), L '=
f 1(
l), L 〞==
f 2(
l).
Further, in described step (3), also comprise and fill up the step of omitting point, tri-kinds of color components of RGB to each pixel in compensating images are searched respectively, if occur, partial pixel point lacks X value, the X value of this pixel is filled up, wherein, X is tri-kinds of color components of a kind of RGB wherein.
Further, the method that X value is filled up is: the X value corresponding with at least two pixels of this pixel phase neighbour is averaging to calculating, and the result that is averaging calculating is filled up to the X value into this pixel.
Further, in described step (3), after obtaining the tri-kinds of color components of RGB after described each pixel distortion, before forming compensating images, also comprise the step of processing for overlapping point, tri-kinds of color components of RGB after the each pixel distortion obtaining are searched respectively, if occur partial pixel point wherein a kind of color component there are multiple values, the plurality of value is processed into a value.
Preferably, the described method of processing for overlapping point is, by the calculating of averaging of described multiple values.
Based on above-mentioned a kind of method for displaying image with optical lens and display screen, the present invention provides a kind of display system of method for displaying image simultaneously, comprise optical lens, be arranged at the display screen before optical lens and connect the image adjustment module of described display screen, described image adjustment module comprises:
Virtual reversion lens unit, for the described optical lens that reverses virtually according to the optical parametric of described optical lens, obtains virtual reversion lens, and the image of described reversion lens and the image of described optical lens reverse;
Distortion factor computing unit, for calculating respectively the distortion factor of tri-kinds of color components of RGB after described reversion lens according to the optical parametric of reversion lens, is a1, a2, a3;
Image control unit, for receiving pre-demonstration image, amplifies respectively a1, a2, a3 processing doubly by the each pixel of described pre-demonstration image, obtains the tri-kinds of color components of RGB after described each pixel distortion, forms compensating images, exports described display screen to.
Further, described image control unit is also searched respectively for tri-kinds of color components of RGB to the each pixel of compensating images before exporting described compensating images to described display screen, fills up tri-kinds of color components of RGB of omission; And/or,
Described image control unit, also for after the tri-kinds of color components of RGB that obtain after described each pixel distortion, before forming compensating images, is searched respectively the tri-kinds of color components of RGB after the each pixel distortion obtaining, and overlapping point is processed.
Compared with prior art, advantage of the present invention and good effect are: the method for displaying image with optical lens and display screen of the present invention, by tri-kinds of color components of image RGB are carried out respectively to distortion compensation, solve the distortion degree difference due to three kinds of color wavelength differences, if adopt the words image after treatment of unified standard compensation can be fuzzy or the problem of ghost image, by being done to inverse operation according to distortion factor, display original image compensates, can offset the image distortion that refraction produces through eyepiece, finally be presented in user's eye is clear, distortionless image, good visual effect, in addition, also fix for its distortion factor of fixing eyepiece, therefore, corresponding parameter only need be calculated once applicable to the compensation of display being exported to all images, fast, convenient.
Read by reference to the accompanying drawings after the detailed description of embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the light path schematic diagram of current head-mounted display in background technology;
Fig. 2 is the image that in background technology, display normally shows output;
Fig. 3 is the fault image after eyepiece 102 in background technology;
Fig. 4 is the schematic diagram that in background technology, tri-kinds of color components of RGB separate after eyepiece 102;
Fig. 5 is the image through over-compensation of display output in embodiments of the invention one;
Fig. 6 (a) be before the distortion of R color component in embodiments of the invention one with distortion after the function relation curve of image height;
Fig. 6 (b) be before the distortion of G color component in embodiments of the invention one with distortion after the function relation curve of image height;
Fig. 6 (c) be before the distortion of B color component in embodiments of the invention one with distortion after the function relation curve of image height;
Fig. 7 is the method for displaying image process flow diagram in embodiments of the invention one with optical lens and display screen;
Fig. 8 is a kind of example structure schematic diagram of image display system proposed by the invention;
Fig. 9 is the schematic diagram of the demonstration image process of the display system shown in Fig. 8.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment mono-, the present embodiment provides a kind of method for displaying image with optical lens and display screen, shown in Fig. 7 and Fig. 8,9, comprises the following steps:
S1, according to the optical parametric of the described optical lens described optical lens that reverses virtually, obtain virtual reversion lens, the image of described reversion lens and the image of described optical lens reverse;
S2, according to reversion lens optical parametric calculate respectively the distortion factor of tri-kinds of color components of RGB after described reversion lens, be a1, a2, a3;
S3, pre-show that the each pixel of image amplifies respectively a1, a2, a3 processing doubly by one, obtain the tri-kinds of color components of RGB after described each pixel distortion, form compensating images;
S4, described compensating images export to after described demonstration screen display, are shown as normal picture through described optical lens.
The method for displaying image principle of work with optical lens and display screen of the present embodiment is, first, the distortion degree difference due to tri-kinds of color wavelength differences of RGB, also be presented as distortion factor difference, in the present embodiment by tri-kinds of color components of image RGB are carried out respectively to distortion compensation, can be fuzzy or the problem of ghost image if solved the existing words image after treatment that adopts unified standard compensation.Secondly, distortion factor before and after distorting by calculating, display original image is done to inverse operation according to distortion factor and compensate, can offset the distortion that image produces through eyepiece refraction, being finally presented in user's eye is clear, distortionless image, good visual effect, in addition also fix for its distortion factor of fixing eyepiece, therefore,, corresponding parameter only need be calculated once applicable to the compensation of display being exported to all images, quick, convenient.
It should be noted that, because the tri-kinds of color component coordinates of the each pixel RGB of original image before distortion overlap, therefore, tri-kinds of color component coordinate figures of the RGB of the pixel that in original image, coordinate is (x1, y1) are all identical.
As a preferred embodiment, known by comparison diagram 2, Fig. 3, some pixels to the distance of central point of the image before distortion and after distortion changes, also, the value of image height has directly been reacted distortion degree, therefore, in order more accurately image to be compensated, distortion factor in the present embodiment is calculated by image height, and in described step S1, the computing method of distortion factor are:
Set up an image object plane coordinate system before reversion lens, wherein, the image height of pixel (x1, y1) in object plane coordinate system
lfor this pixel is to the distance of coordinate system central point
;
The image height that obtains the RGB tri-kind color components of this pixel after reversion lens is respectively L, L ', L 〞;
The distortion factor of tri-kinds of color components of RGB after described reversion lens is:
R:
；
G:
；
B:
。
Known equally by comparison diagram 2, Fig. 3, the distortion factor difference of different pixels point, change less the closer to central point, therefore, distortion factor at the pixel of the different coordinates of each color component is different, if adopt unified distortion factor to compensate, cannot realize the distortion of each pixel is compensated, therefore, need to calculate respectively the distortion factor of each pixel at each color component, form the constant array of distortion factor, be also, in described step S1, described a1, a2, a3 are constant array.
Because this method definitive application uses in industrial products, cannot be as can test the image height after distortion by individual element point under laboratory environment, therefore, preferably find out in advance before image height distortion with distortion after the funtcional relationship of image height, after described distortion, the computing method of the image height of tri-kinds of color components of RGB of pixel are:
Further again, obtain the image height L of pixel (x1, y1) through the tri-kinds of color components of RGB after lens that reverse, L ', the step of L 〞 comprises:
Simulate the image corresponding relation of described reversion lens according to the optical parametric of described reversion lens;
According to the former image height of tri-kinds of color components of described corresponding relation output RGB in object plane coordinate system and the new image height after reversion lens;
According to the former image height of tri-kinds of color components of RGB
l 0with new image height L
0, L
0', L
0〞 simulates the new image height of tri-kinds of color components of RGB about the funtcional relationship of former image height, i.e. before tri-kinds of color components of RGB distortion with distortion after the funtcional relationship of image height
R:
；
G:
；
B:
；
According to the former image height in the object plane coordinate system of described pixel (x1, y1)
, and described funtcional relationship, the tri-kinds of color components of RGB that obtain this pixel are respectively L=through the new image height reversing after lens
f(
l), L '=
f 1(
l), L 〞==
f 2(
l).
During due to execution step S3, all pixels of original image are compensated, therefore the coordinate of each pixel is determined, therefore, is (x for arbitrary coordinate
1, y
1) pixel, its image height is:
so, can calculate easily the image height after distortion by above-mentioned function formula, and then be easy to calculate distortion factor.
The present embodiment has provided the funtcional relationship of the wherein a kind of eyepiece recording, wherein,
curve can be referring to shown in Fig. 6 (a),
curve can be referring to shown in Fig. 6 (b),
curve can be referring to shown in Fig. 6 (c), and in above-mentioned three width curve maps, transverse axis represents the image height before distortion, and the longitudinal axis represents the image height after distortion.Utilize the image height of distortion preceding pixel point
l 0calculate the image height L of the rear tri-kinds of color components of pixel RGB of distortion
0, L
0', L
0〞, then according to rectangular coordinate relation, can calculate respectively the coordinate figure (x of rear image RGB tri-color components of compensation
2, y
2), (x
2', y
2'), (x
2〞, y
2〞):
；
；
；
；
；
；
Because distortion and the dispersion values of this image are just contrary with the eyepiece of head-mounted display; this figure is shown by display, then when seeing through the eyepiece of head-mounted display and watching, distortion and aberration can be compensated; the effect that final human eye is seen is as the normal pictures without any distortion in Fig. 2.
If directly the R in (x1, y1) coordinate points in original image, G, B value are deposited respectively in to its respective coordinates point (x according to above-mentioned corresponding relation
2, y
2), (x
2', y
2'), (x
2〞, y
2〞), in new image, may occur that some point does not have the corresponding relation of former figure, be embodied in image demonstration, these pixels lack certain color component, therefore in described step (3), also comprise and fill up the step of omitting point, and tri-kinds of color components of RGB of each pixel in compensating images are searched respectively, if occur, partial pixel point lacks X value, the X value of this pixel is filled up, wherein, X is tri-kinds of color components of a kind of RGB wherein.Image after compensation reduces its realistic colour more, has avoided losing in image processing process the phenomenon of color component.
As a preferred embodiment, in order to simplify computing method, improve computing velocity, in the present embodiment, preferably adopt mean value method, also be, the method that X value is filled up is: X value corresponding at least two consecutive point of this pixel is averaging to calculating, and result of calculation is filled up to the X value as this pixel.
As a same reason, if directly the R in (x1, y1) coordinate points in original image, G, B value are deposited respectively in to its respective coordinates point (x according to above-mentioned corresponding relation
2, y
2), (x
2', y
2'), (x
2〞, y
2〞), wherein a kind of color component that may occur some pixel in new image has multiple values, also there is overlapping point, in order not affect demonstration, in described step (3), after obtaining the tri-kinds of color components of RGB after described each pixel distortion, before forming compensating images, also comprise the step of processing for overlapping point, tri-kinds of color components of RGB after the each pixel distortion obtaining are searched respectively, if occur partial pixel point wherein a kind of color component there are multiple values, the plurality of value is processed into a value.
Equally as a preferred embodiment, in order to simplify computing method, improve computing velocity, in the present embodiment, preferably adopt mean value method, also, the described method of processing for overlapping point is, by the calculating of averaging of described multiple values.By multiple overlapping points are processed into a point, can prevent from showing that written-out program makes mistakes, make it export every width image and all have the value of unique correspondence.
Embodiment bis-, based on a kind of method for displaying image with optical lens and display screen in embodiment mono-, the present embodiment provides a kind of display system of method for displaying image, as shown in FIG. 8 and 9, comprise optical lens 102, be arranged at the display screen 101 before optical lens 102 and connect the image adjustment module 103 of described display screen 101, described image adjustment module 103 comprises:
Virtual reversion lens unit, for the described optical lens that reverses virtually according to the optical parametric of described optical lens, obtains virtual reversion lens, and the image of described reversion lens and the image of described optical lens reverse;
Distortion factor computing unit, for calculating respectively the distortion factor of tri-kinds of color components of RGB after described reversion lens according to the optical parametric of reversion lens, is a1, a2, a3;
Image control unit, for receiving pre-demonstration image, amplifies respectively a1, a2, a3 processing doubly by the each pixel of described pre-demonstration image, obtains the tri-kinds of color components of RGB after described each pixel distortion, forms compensating images, exports described display screen to.
Due to the compensation of image with this image distortion and the dispersion during through optical lens 102 contrary; therefore; as shown in Figure 9; compensating images is after optical lens 102; distortion and aberration can be compensated; the effect that final human eye is seen is as the normal pictures without any distortion and aberration in Fig. 9.
Further, described image control unit is also searched respectively for tri-kinds of color components of RGB to the each pixel of compensating images before exporting described compensating images to described display screen, fills up tri-kinds of color components of RGB of omission; And/or,
Described image control unit, also for after the tri-kinds of color components of RGB that obtain after described each pixel distortion, before forming compensating images, is searched respectively the tri-kinds of color components of RGB after the each pixel distortion obtaining, and overlapping point is processed.Tri-kinds of color components of the RGB that fills up omission by the present embodiment and overlapping point is processed, the image after compensation reduces its realistic colour more, has avoided losing in image processing process the phenomenon of color component.
Native system also can be applicable in the nearly eye display devices such as head-mounted display, but protection scope of the present invention does not limit the applied environment of native system.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present invention, also should belong to protection scope of the present invention.
Claims (10)
1. a method for displaying image with optical lens and display screen, is characterized in that, comprises the following steps:
(1), according to the optical parametric of the described optical lens described optical lens that reverses virtually, obtain virtual reversion lens, the image of described reversion lens and the image of described optical lens reverse;
(2), according to reversion lens optical parametric calculate respectively the distortion factor of tri-kinds of color components of RGB after described reversion lens, be a1, a2, a3;
(3), show by one that in advance the each pixel of image amplifies respectively a1, a2, a3 processing doubly, obtains the tri-kinds of color components of RGB after described each pixel distorts, formation compensating images;
(4), described compensating images exports to after described demonstration screen display, is shown as normal picture through described optical lens.
2. method for displaying image according to claim 1, is characterized in that, in described step (2), the computing method of distortion factor are:
Set up an image object plane coordinate system before reversion lens, wherein, the image height of pixel (x1, y1) in object plane coordinate system
lfor this pixel is to the distance of coordinate system central point,
;
The image height that obtains the RGB tri-kind color components of this pixel after reversion lens is respectively L, L ', L 〞;
The distortion factor of tri-kinds of color components of RGB after described reversion lens is:
R:
；
G:
；
B:
。
3. method for displaying image according to claim 2, is characterized in that, in described step (2), and the distortion factor difference of different pixels point, described a1, a2, a3 are constant array.
4. method for displaying image according to claim 2, is characterized in that, obtains the image height L of the RGB tri-kind color components of pixel (x1, y1) after reversion lens, L ', and the step of L 〞 comprises:
Simulate the image corresponding relation of described reversion lens according to the optical parametric of described reversion lens;
According to the former image height of tri-kinds of color components of described corresponding relation output RGB in object plane coordinate system and the new image height after reversion lens;
According to the former image height of tri-kinds of color components of RGB
l 0with new image height L
0, L
0', L
0〞 simulates the new image height of tri-kinds of color components of RGB about the funtcional relationship of former image height, i.e. before tri-kinds of color components of RGB distortion with distortion after the funtcional relationship of image height
R:
；
G:
；
B:
；
According to the former image height in the object plane coordinate system of described pixel (x1, y1)
, and described funtcional relationship, the tri-kinds of color components of RGB that obtain this pixel are respectively L=through the new image height reversing after lens
f(
l), L '=
f 1(
l), L 〞==
f 2(
l).
5. according to the method for displaying image described in claim 1-4 any one claim, it is characterized in that, form compensating images in described step (3) before, also comprise the step of filling up omission point, tri-kinds of color components of RGB to each pixel in compensating images are searched respectively, if occur, partial pixel point lacks X value, the X value of this pixel is filled up, wherein, X is tri-kinds of color components of a kind of RGB wherein.
6. method for displaying image according to claim 5, it is characterized in that, the method that X value is filled up is: the X value corresponding with at least two pixels of this pixel phase neighbour is averaging to calculating, and the result that is averaging calculating is filled up to the X value into this pixel.
7. according to the method for displaying image described in claim 1-4 any one claim, it is characterized in that, in described step (3), after obtaining the tri-kinds of color components of RGB after described each pixel distortion, before forming compensating images, also comprise the step of processing for overlapping point, the tri-kinds of color components of RGB after the each pixel distortion obtaining are searched respectively, if occur partial pixel point wherein a kind of color component there are multiple values, the plurality of value is processed into a value.
8. method for displaying image according to claim 7, is characterized in that, the described method of processing for overlapping point is, by the calculating of averaging of described multiple values.
9. the display system of the method for displaying image described in any one in an application rights requirement 1 to 8, it is characterized in that, comprise optical lens, be arranged at the display screen before optical lens and connect the image adjustment module of described display screen, described image adjustment module comprises:
Virtual reversion lens unit, for the described optical lens that reverses virtually according to the optical parametric of described optical lens, obtains virtual reversion lens, and the image of described reversion lens and the image of described optical lens reverse;
Distortion factor computing unit, for calculating respectively the distortion factor of tri-kinds of color components of RGB after described reversion lens according to the optical parametric of reversion lens, is a1, a2, a3;
Image control unit, for receiving pre-demonstration image, amplifies respectively a1, a2, a3 processing doubly by the each pixel of described pre-demonstration image, obtains the tri-kinds of color components of RGB after described each pixel distortion, forms compensating images, exports described display screen to.
10. display system as claimed in claim 1, it is characterized in that, described image control unit is also searched respectively for tri-kinds of color components of RGB to the each pixel of compensating images before exporting described compensating images to described display screen, fills up tri-kinds of color components of RGB of omission; And/or,
Described image control unit, also for after the tri-kinds of color components of RGB that obtain after described each pixel distortion, before forming compensating images, is searched respectively the tri-kinds of color components of RGB after the each pixel distortion obtaining, and overlapping point is processed.
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| CN106127714A (en) * | 2016-07-01 | 2016-11-16 | 南京睿悦信息技术有限公司 | A kind of measuring method of virtual reality head-mounted display equipment distortion parameter |
| CN106791754A (en) * | 2016-12-22 | 2017-05-31 | 歌尔科技有限公司 | A kind of equipment chromatic aberration correction method and system |
| CN107219629A (en) * | 2017-07-14 | 2017-09-29 | 惠州Tcl移动通信有限公司 | Method, storage medium and the equipment of anti-VR equipment dispersion are superimposed using RGB |
| CN109643018A (en) * | 2016-08-30 | 2019-04-16 | 麦克赛尔株式会社 | Information display device |
| CN113222862A (en) * | 2021-06-04 | 2021-08-06 | 黑芝麻智能科技(上海)有限公司 | Image distortion correction method, device, electronic equipment and storage medium |
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