CN108495054B - Method and device for processing high dynamic range signal and computer storage medium - Google Patents
Method and device for processing high dynamic range signal and computer storage medium Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a device for processing a high dynamic range signal and a computer storage medium. The invention relates to a method for processing a high dynamic range signal, which comprises the following steps: acquiring the maximum brightness value of a display screen, the maximum content brightness level of a high dynamic range signal and the maximum frame average brightness level; judging whether the brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value; and if the brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value, generating a first mapping curve according to the maximum frame average brightness level, and performing electro-optical conversion on the high dynamic range signal according to the first mapping curve. The embodiment of the invention can improve the display effect of the HDR content on the display screen.
Description
Technical Field
The present invention relates to image display technologies, and in particular, to a method and an apparatus for processing a high dynamic range signal, and a computer storage medium.
Background
Compared with common images, High-Dynamic Range (HDR) images can provide more Dynamic ranges and image details, and according to Low-Dynamic Range (LDR) images with different exposure times, LDR images with optimal details corresponding to each exposure time are used to synthesize a final HDR image, so that visual effects in a real environment can be better reflected.
HDR Content (e.g., video Content) is produced in various types, for example, luminance values corresponding to a Maximum Content luminance Level (Max CLL) of the HDR Content include 4000nit (nit), 3000nit, 1000nit, 800nit, 300nit, etc., in an HDR luminance Mapping (Tone Mapping) link, theoretically, a complete SMPTE2084 curve is restored, the range of the SMPTE2084 curve is 0 to 10000nit, however, considering that a Maximum luminance value of a display screen is mainly concentrated below 1000nit, the HDR Content is often not produced with a luminance value corresponding to the clmax being 10000nit, but is produced into 600nit, 1000nit, 4000nit, etc. according to an actual situation, and therefore, a luminance value corresponding to the Max CLL of the HDR Content needs to be processed by luminance Mapping (Tone Mapping) to correspond to a Maximum luminance value of the display screen, so as to achieve a better display effect.
Specifically, a manner of stretching or compressing the clipped SMPTE2084 curve is adopted, for example, when the Max CLL of the HDR content is 4000nit, a portion from 0 to 4000nit of the SMPTE2084 curve is clipped, that is, no signal is input in the range of 4000-10000nit, and the curve is in a linear state, fig. 1 is a schematic diagram of the clipped curve, fig. 2 is a schematic diagram of the curve after luminance Mapping, the curve shown in fig. 1 is the clipped curve, wherein the ordinate 4000nit corresponds to the abscissa 0.9, actually there is no signal input in an area after the abscissa 0.9, and the area actually has a maximum value, so a corresponding luminance Mapping (Tone Mapping) process is performed, as shown in fig. 2, and an output value corresponding to the abscissa 0.9 is mapped to an output of the ordinate 1.0.
However, the stretched curve is used for electro-optical conversion, so that the brightness value corresponding to the signal is amplified, the brightness of the low-brightness part is raised, the overall contrast is reduced, and the display effect of the display screen is poor.
Disclosure of Invention
The embodiment of the invention provides a method and a device for processing a high dynamic range signal and a computer storage medium, which are used for improving the display effect of HDR content on a display screen.
In a first aspect, an embodiment of the present invention provides a method for processing a high dynamic range signal, including:
acquiring the maximum brightness value of a display screen, the maximum content brightness level of a high dynamic range signal and the maximum frame average brightness level;
judging whether the brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value;
and if the brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value, generating a first mapping curve according to the maximum frame average brightness level, and performing electro-optical conversion on the high dynamic range signal according to the first mapping curve.
With reference to the first aspect, in a possible implementation manner of the first aspect, if the brightness value corresponding to the maximum content brightness level is not greater than the maximum brightness value, the high dynamic range signal is subjected to electro-optical conversion according to a second mapping curve.
With reference to the first aspect or one possible implementation manner of the first aspect, in another possible implementation manner of the first aspect, the generating a first mapping curve according to the maximum frame average brightness level includes:
judging whether the brightness value corresponding to the maximum frame average brightness level is greater than the maximum brightness value;
if the brightness value corresponding to the maximum frame average brightness level is larger than the maximum brightness value, generating the first mapping curve according to the maximum brightness value; and if not, generating the first mapping curve according to the brightness distribution information of the high dynamic range signal and the maximum brightness value.
With reference to the first aspect or any one of the possible implementations of the first aspect, in another possible implementation of the first aspect, the generating the first mapping curve according to the maximum brightness value includes:
determining a mapping point according to the maximum brightness value and the maximum content brightness level;
determining a first curve turning point according to the maximum brightness value and a first preset proportion;
and generating the first mapping curve according to the mapping point, the first curve turning point and a standard conversion curve.
With reference to the first aspect or any one of the possible implementations of the first aspect, in another possible implementation of the first aspect, the first mapping curve is the same as the standard conversion curve between 0 and the first curve turning point, and the first mapping curve is a line segment corresponding to a linear or non-linear function between the first curve turning point and the mapping point.
With reference to the first aspect or any one of the possible implementation manners of the first aspect, in another possible implementation manner of the first aspect, the generating the first mapping curve according to the brightness distribution information of the high dynamic range signal and the maximum brightness value includes:
determining a mapping point according to the maximum brightness value and the maximum content brightness level;
determining a second curve turning point according to the brightness distribution information and a second preset proportion;
and generating the first mapping curve according to the mapping point, the second curve turning point and a standard conversion curve.
With reference to the first aspect or any one of the possible implementation manners of the first aspect, in another possible implementation manner of the first aspect, the determining a second curve turning point according to the brightness distribution information and a second preset proportion includes:
determining a turning brightness value according to the brightness distribution information and a second preset proportion;
and taking the point corresponding to the turning brightness value on the standard conversion curve as the turning point of the second curve.
With reference to the first aspect or any one of the possible implementations of the first aspect, in another possible implementation of the first aspect, the first mapping curve is the same as the standard conversion curve between 0 and the second curve turning point, and the first mapping curve is a line segment corresponding to a linear or non-linear function between the second curve turning point and the mapping point.
With reference to the first aspect or any one of the possible implementations of the first aspect, in another possible implementation of the first aspect, the method further includes:
acquiring content histogram information of the high dynamic range signal;
and determining the brightness distribution information according to the content histogram information.
In a second aspect, an embodiment of the present invention provides a device for processing a high dynamic range signal, including:
a memory for storing a computer program;
a processor adapted to execute the computer program to implement the method according to the first aspect or any of the possible implementations of the first aspect.
In a third aspect, an embodiment of the present invention provides a computer storage medium, including: the computer storage medium is used for storing a computer program which, when executed, is used for implementing the method according to the first aspect or any one of the possible implementations of the first aspect.
According to the processing method and device for the high dynamic range signal and the computer storage medium of the embodiment of the invention, whether the brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value or not is judged by acquiring the maximum brightness value of the display screen, the maximum content brightness level of the high dynamic range signal and the maximum frame average brightness level, if the brightness value corresponding to the maximum content brightness level is not greater than the maximum brightness value, a first mapping curve is generated according to the maximum frame average brightness level, electro-optical conversion is performed on the high dynamic range signal according to the first mapping curve, namely, the mapping curve is adjusted to perform electro-optical conversion on an HDR signal according to the brightness value corresponding to the maximum content brightness level and the maximum frame average brightness, and the display effect of the HDR content on the display screen can be improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a cut-out curve;
FIG. 2 is a diagram illustrating a curve after luminance mapping;
fig. 3 is a schematic view of an application scenario of the method for processing a high dynamic range signal according to an embodiment of the present invention;
FIG. 4 is a flowchart of a first embodiment of a method for processing a high dynamic range signal according to the present invention;
FIG. 5 is a diagram of a second mapping curve according to the present invention;
FIG. 6 is a flowchart of a second embodiment of a method for processing a high dynamic range signal according to the present invention;
FIG. 7A is a diagram of a first mapping curve according to the present invention;
FIG. 7B is a diagram of another first mapping curve according to the present invention;
fig. 8 is a schematic structural diagram of a high dynamic range signal processing apparatus according to a first embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Reference herein to "and/or" describing an associative relationship of associated objects means that there may be three relationships, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.
Fig. 3 is a schematic view of an application scenario of the processing method of a high dynamic range signal according to the embodiment of the present invention, as shown in fig. 3, the application scenario includes a terminal and a server, the terminal may obtain a content to be played from the server, and after the content to be played is analyzed and decoded, the content to be played is displayed on a display screen of the terminal, where the content to be played may specifically be an HDR content, and the terminal may improve presentation quality of the HDR content on the display screen by executing the processing method of an HDR signal according to the embodiment of the present invention. The specific implementation process can be seen in the following specific explanation of the examples.
It should be noted that the content to be played may be obtained from a server or may be a content stored locally in the terminal, which is not limited in the embodiment of the present invention.
The terminal according to the embodiment of the present invention may also be referred to as a terminal device, a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), or the like. The terminal may be a Television (TV), a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an Augmented Reality (AR) terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote surgery (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like.
Fig. 4 is a flowchart of a first embodiment of a method for processing a high dynamic range signal according to the present invention, and as shown in fig. 4, the method of this embodiment may include:
step 101, obtaining a maximum brightness value of a display screen, a maximum content brightness level of a high dynamic range signal and a maximum frame average brightness level.
The Maximum brightness value of the display screen is an inherent attribute of the display screen, and the Maximum Content brightness Level (Max CLL) and the Maximum frame Average brightness Level (Max FALL) of the high dynamic range signal can be obtained from the metadata, that is, the metadata is analyzed to obtain the Max CLL and the Max FALL. The high dynamic range signal may be a video content signal, and the high dynamic range signal may include metadata and at least one frame of image.
And 102, judging whether the brightness value corresponding to the maximum content brightness level is larger than the maximum brightness value or not, if not, executing a step 103, and if so, executing a step 104.
Specifically, the luminance value corresponding to the Max CLL is compared with the maximum luminance value of the display screen, if the luminance value corresponding to the Max CLL is not greater than the maximum luminance value of the display screen, the following step 103 is executed, and if the luminance value corresponding to the Max CLL is greater than the maximum luminance value of the display screen, the following step 104 is executed.
And 103, if the brightness value corresponding to the maximum content brightness level is not greater than the maximum brightness value, performing electro-optical conversion on the high dynamic range signal according to a second mapping curve.
The second mapping curve may be a portion of the SMPTE2084 curve, that is, the portion of the SMPTE2084 curve is adopted to perform the electro-optical conversion on the HDR signal. FIG. 5 is a diagram of a second mapping curve of the present invention, as shown in FIG. 5, the second mapping curve is a portion of an SMPT2084 curve, the horizontal axis represents the input HDR signal, i.e. the input electrical signal, such as a code value (code value), the range is represented by 0-1, the bit width of different chips is different, such as 10 bits (0-1023) and 12 bits (0-4095), and the vertical axis represents the optical information of the display screen, such as luminance values, the range is represented by 0-1. A portion of the SMPTE2084 curve may be truncated according to the luminance value corresponding to the Max CLL as the second mapping curve, i.e., the luminance value corresponding to the HDR signal may be determined on the second mapping curve.
That is, when the luminance value corresponding to the Max CLL is not greater than the maximum luminance value of the display screen, the display screen can completely restore the HDR signal, and in order to ensure that an electro-Optical Transfer Function (EOTF) follows an SMPTE2084 curve, the SMPTE2084 curve may be used to perform electro-Optical conversion on the HDR signal.
And 104, if the average brightness level of the high dynamic range signal is larger than the maximum frame average brightness level, generating a first mapping curve according to the maximum frame average brightness level, and performing electro-optical conversion on the high dynamic range signal according to the first mapping curve.
Specifically, if the brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value, a first mapping curve is generated according to MaxFALL, and the brightness value corresponding to the HDR signal is determined on the first mapping curve, so as to complete the electro-optical conversion.
Each frame image of the HDR signal includes code values (pixel values) of a plurality of pixel points, i.e., input electric signals, and the code values (pixel values) of the plurality of pixel points are converted into corresponding luminance values by steps 103 and 104, so that the image is presented on the display screen with the luminance values.
In this embodiment, by obtaining a maximum brightness value of a display screen, a maximum content brightness level of a high dynamic range signal, and a maximum frame average brightness level, it is determined whether a brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value, if the brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value, a first mapping curve is generated according to the maximum frame average brightness level, and an electro-optical conversion is performed on the high dynamic range signal according to the first mapping curve, that is, the electro-optical conversion is performed on an HDR signal according to the brightness value corresponding to the maximum content brightness level and the maximum frame average brightness by adjusting the mapping curve, so that a display effect of the HDR content on the display screen can be improved.
The following describes the technical solution of the embodiment of the method shown in fig. 4 in detail by using several specific embodiments.
Fig. 6 is a flowchart of a second embodiment of a method for processing a high dynamic range signal according to the present invention, fig. 7A is a schematic diagram of a first mapping curve according to the present invention, and fig. 7B is a schematic diagram of another first mapping curve according to the present invention, as shown in fig. 6, the method of the present embodiment may include:
step 201, obtaining the maximum brightness value of the display screen, the maximum content brightness level of the high dynamic range signal, and the maximum frame average brightness level.
Step 202, determining whether the brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value, if not, performing step 203, and if so, performing step 204.
Step 203, if the brightness value corresponding to the maximum content brightness level is not greater than the maximum brightness value, performing electro-optical conversion on the high dynamic range signal according to a second mapping curve.
For a detailed explanation of step 201 to step 203, refer to step 101 to step 103 in the embodiment shown in fig. 4, which is not described herein again.
Step 204, determining whether the brightness value corresponding to the maximum frame average brightness level is greater than the maximum brightness value, if so, executing step 205, and if not, executing step 206.
That is, when the brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value, it is further determined whether the brightness value corresponding to the maximum frame average brightness level (Max well) is greater than the maximum brightness value of the display screen, if so, step 205 is executed, and if not, step 206 is executed.
Step 205, if the brightness value corresponding to the maximum frame average brightness level is greater than the maximum brightness value, generating the first mapping curve according to the maximum brightness value.
One specific implementation manner of generating the first mapping curve according to the maximum brightness value is as follows: determining a mapping point according to the maximum brightness value and the maximum content brightness level; determining a first curve turning point according to the maximum brightness value and a first preset proportion; and generating the first mapping curve according to the mapping point, the first curve turning point and a standard conversion curve.
The standard conversion curve may be an SMPT2084 curve.
Specifically, the first mapping curve is the same as the standard conversion curve from 0 to the first curve turning point, and the first mapping curve is a line segment corresponding to a linear or non-linear function from the first curve turning point to the mapping point.
For example, the maximum luminance value of the display screen is 1000nit, the luminance value corresponding to Max CLL of the HDR signal is greater than 1000nit, for example 1500nit, the luminance value corresponding to Max FALL is greater than 1000nit, for example 1100, after the determining step of step 202, step 204 is executed to compare whether the luminance value corresponding to Max FALL is greater than the maximum luminance value of the display screen, since 1100nit is greater than 1000nit, step 205 is executed, in step 205, when the maximum luminance value (1000nit) of the display screen and Max CLL are determined, that is, the Max CLL corresponds to the maximum luminance value (1000nit) of the display screen, that is, when the luminance value corresponding to the code value of the HDR content is equal to the luminance value corresponding to Max CLL, the luminance value of the display screen obtained after the electro-to-optic conversion of the HDR content is 1000nit, for example, as shown in fig. 7A mapping point, the first curve turning point is determined according to the maximum luminance value (1000nit) of the display screen and the first preset ratio, specifically, assuming that the first predetermined ratio is 80%, the maximum brightness value (1000nit) of the display screen is multiplied by 80%, i.e., 800nit, and the corresponding point on the SMPTE2084 curve of 800nit is the first curve turning point, specifically, as shown in fig. 7A, a smooth curve may be set between the mapping point and the first curve turning point, the first mapping curve is the same as the SMPTE2084 curve from 0 to the first curve turning point, and the smooth curve is shown in fig. 7A between the first curve turning point and the mapping point. It should be understood that fig. 7A is only an example, and a straight line or a broken line may be formed between the turning point and the mapping point of the first curve, which is not illustrated herein.
Step 206, if the brightness value corresponding to the maximum frame average brightness level is not greater than the maximum brightness value, generating the first mapping curve according to the brightness distribution information of the high dynamic range signal and the maximum brightness value.
One specific implementation manner of generating the first mapping curve according to the luminance distribution information of the high dynamic range signal and the maximum luminance value is as follows: determining a mapping point according to the maximum brightness value and the maximum content brightness level; determining a second curve turning point according to the brightness distribution information and a second preset proportion; and generating the first mapping curve according to the mapping point, the second curve turning point and a standard conversion curve.
Specifically, this step is different from the first curve turning point in step 205, and this step determines the second curve turning point according to the luminance distribution information and the second preset ratio.
A specific implementation manner of determining the turning point of the second curve according to the brightness distribution information and the second preset ratio includes: determining a turning brightness value according to the brightness distribution information and a second preset proportion; and taking the point corresponding to the turning brightness value on the standard conversion curve as the turning point of the second curve.
The luminance distribution information includes all luminance value distribution information of the HDR signal, for example, it includes a ratio of pixels having luminance values from 0 to 20nit in the entire HDR signal, a ratio of pixels having luminance values from 20 to 50nit in the entire HDR signal, and the like, and assuming that the second preset ratio is 90%, it is determined that the ratio of pixels having luminance values from 0 to X nit in the entire HDR signal is 90% according to the luminance distribution information, and then X is a turning luminance value.
Specifically, the first mapping curve is the same as the standard conversion curve between 0 and the second curve turning point, and the first mapping curve is a line segment corresponding to a linear or non-linear function between the second curve turning point and the mapping point.
For example, the maximum luminance value of the display screen is 1000nit, the luminance value corresponding to Max CLL of the HDR signal is greater than 1000nit, for example 1500nit, the luminance value corresponding to Max FALL is less than 1000nit, for example 500, after the determination step of step 202, step 204 is executed to compare whether the luminance value corresponding to Max FALL is greater than the maximum luminance value of the display screen, since 900nit is less than 1000nit, step 206 is executed, in step 206, a mapping point may be determined according to the maximum luminance value (1000nit) of the display screen and the Max CLL, that is, when the luminance value corresponding to the code value of the HDR content is equal to the luminance value corresponding to Max CLL, the luminance value of the display screen obtained after performing the electro-optical conversion on the code value of the HDR content is 1000nit, for example, as shown in fig. 7B, a second curve transition point is determined according to the luminance distribution information and a second preset ratio, specifically, assuming that the second predetermined ratio is 90%, a second curve turning point is determined according to the luminance distribution information and the second predetermined ratio, assuming that 900nit, a point corresponding to the 900nit on the SMPTE2084 curve is the second curve turning point, specifically, as shown in fig. 7B, a smooth curve may be set between the mapping point and the second curve turning point, the first mapping curve is the same as the SMPTE2084 curve from 0 to the second curve turning point, and the smooth curve is shown in fig. 7B between the second curve turning point and the mapping point. It should be understood that fig. 7B is only an example, and a straight line or a broken line may be formed between the turning point and the mapping point of the first curve, which is not illustrated herein.
And step 207, performing electro-optical conversion on the high dynamic range signal according to the first mapping curve.
Wherein the first mapping curve may be generated by step 205 or step 206. The HDR signal is electro-optically converted using the first mapping curve.
As illustrated above, by performing the step 206, the part 900nit to 1500nit in the HDR signal is restored by 900nit to 1000nit of the display screen, so that the authenticity of restoring the main luminance part can be ensured, and the loss of the whole signal is not caused.
Optionally, one determination method of the luminance distribution information is as follows: and acquiring content histogram information of the high dynamic range signal, and determining the brightness distribution information according to the content histogram information.
Optionally, the first preset proportion and the second preset proportion are any values, for example, the first preset proportion and the second preset proportion are 90%.
In this embodiment, by obtaining the maximum brightness value of the display screen, the maximum content brightness level of the high dynamic range signal, and the maximum frame average brightness level, it is determined whether the brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value, if the brightness value corresponding to the maximum content brightness level is not greater than the maximum brightness value, performing electro-optical conversion on the high dynamic range signal according to a second mapping curve, if so, determining whether the brightness value corresponding to the maximum frame average brightness level is greater than the maximum brightness value, generating the first mapping curve according to the maximum brightness value, if the brightness value corresponding to the maximum frame average brightness level is not greater than the maximum brightness value, the first mapping curve is generated according to the luminance distribution information of the high dynamic range signal and the maximum luminance value. The HDR signal is subjected to electro-optical conversion by using different mapping curves, and the display effect of the HDR content on a display screen can be improved.
Compared with the electro-optical conversion by using the curve after stretching, the whole contrast ratio can be improved.
Fig. 8 is a schematic structural diagram of a first embodiment of a high dynamic range signal processing apparatus according to the present invention, and as shown in fig. 8, the apparatus of the present embodiment may include: a memory 11 and a processor 12, wherein the memory 11 is used for storing computer programs; a processor 12 for executing the computer program to implement the method according to any of the embodiments described above.
The apparatus of this embodiment may be configured to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
An embodiment of the present invention further provides a computer storage medium, where the computer storage medium is used to store a computer program, and the computer program is used to implement the method according to any of the above embodiments when executed. The implementation principle and the technical effect are similar, and the detailed description is omitted here.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for processing a high dynamic range signal, comprising:
acquiring the maximum brightness value of a display screen, the maximum content brightness level of a high dynamic range signal and the maximum frame average brightness level;
judging whether the brightness value corresponding to the maximum content brightness level is greater than the maximum brightness value;
if the brightness value corresponding to the maximum content brightness level is larger than the maximum brightness value, generating a first mapping curve according to the maximum frame average brightness level, and performing electro-optical conversion on the high dynamic range signal according to the first mapping curve;
generating a first mapping curve according to the maximum frame average brightness level includes:
if the brightness value corresponding to the maximum frame average brightness level is larger than the maximum brightness value, generating the first mapping curve according to the maximum brightness value; and if not, generating the first mapping curve according to the brightness distribution information of the high dynamic range signal and the maximum brightness value.
2. The method of claim 1, further comprising:
and if the brightness value corresponding to the maximum content brightness level is not greater than the maximum brightness value, performing electro-optical conversion on the high dynamic range signal according to a second mapping curve.
3. The method of claim 1, wherein said generating said first mapping curve according to said maximum luminance value comprises:
determining a mapping point according to the maximum brightness value and the maximum content brightness level;
determining a first curve turning point according to the maximum brightness value and a first preset proportion;
and generating the first mapping curve according to the mapping point, the first curve turning point and a standard conversion curve.
4. The method as claimed in claim 3, wherein the first mapping curve is the same as the standard transformation curve from 0 to the first curve turning point, and the first mapping curve is a line segment corresponding to a linear or non-linear function from the first curve turning point to the mapping point.
5. The method of claim 1, wherein generating the first mapping curve according to the luminance distribution information of the high dynamic range signal and the maximum luminance value comprises:
determining a mapping point according to the maximum brightness value and the maximum content brightness level;
determining a second curve turning point according to the brightness distribution information and a second preset proportion;
and generating the first mapping curve according to the mapping point, the second curve turning point and a standard conversion curve.
6. The method of claim 5, wherein determining a second curve turning point according to the brightness distribution information and a second preset ratio comprises:
determining a turning brightness value according to the brightness distribution information and a second preset proportion;
and taking the point corresponding to the turning brightness value on the standard conversion curve as the turning point of the second curve.
7. The method as claimed in claim 6, wherein the first mapping curve is the same as the standard transformation curve from 0 to the second curve turning point, and the first mapping curve is a line segment corresponding to a linear or non-linear function from the second curve turning point to the mapping point.
8. An apparatus for processing a high dynamic range signal, comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the method of any one of claims 1 to 7.
9. A computer storage medium, comprising: the computer storage medium is for storing a computer program which when executed is for implementing the method of any one of claims 1 to 7.
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| CN201810299436.3A CN108495054B (en) | 2018-03-30 | 2018-03-30 | Method and device for processing high dynamic range signal and computer storage medium |
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| EP3742432A1 (en) * | 2019-05-24 | 2020-11-25 | InterDigital CE Patent Holdings | Device and method for transition between luminance levels |
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| CN107203974A (en) * | 2016-03-16 | 2017-09-26 | 汤姆逊许可公司 | The methods, devices and systems of HDR HDR to the HDR tones mapping of extension |
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| CN107203974A (en) * | 2016-03-16 | 2017-09-26 | 汤姆逊许可公司 | The methods, devices and systems of HDR HDR to the HDR tones mapping of extension |
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