CN115118939B - Image brightness homogenizing method, computer readable storage medium, electronic device and laser projection image processing device - Google Patents
Image brightness homogenizing method, computer readable storage medium, electronic device and laser projection image processing device Download PDFInfo
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- CN115118939B CN115118939B CN202110286234.7A CN202110286234A CN115118939B CN 115118939 B CN115118939 B CN 115118939B CN 202110286234 A CN202110286234 A CN 202110286234A CN 115118939 B CN115118939 B CN 115118939B
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000005286 illumination Methods 0.000 claims abstract description 4
- 238000004590 computer program Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
Abstract
The invention discloses an image brightness homogenizing method, a computer readable storage medium, electronic equipment and a laser projection image processing device, and relates to the field of optical fiber scanning laser projection. The image brightness homogenizing method, the computer readable storage medium, the electronic equipment and the laser projection image processing device provided by the invention modulate the uncorrected illumination brightness corresponding to each pixel by adding the brightness adjusting coefficient to each pixel, thereby realizing the correction of the brightness uniformity of the display system and ensuring the uniformity and consistency of the display brightness; in addition, the invention does not adopt a method of directly modifying the pixel lighting time length to realize the correction of the uniformity of the display brightness, thereby avoiding the requirement of high modulation bandwidth caused by the utilization of the equal lighting time length in the scanning display, ensuring the display image to have consistent and enough display color depth and enabling the display image to carry out color output according to the color depth required by a target.
Description
Technical Field
The present invention relates to the field of optical fiber scanning laser projection, and in particular, to an image brightness homogenizing method, a computer readable storage medium, an electronic device, and a laser projection image processing apparatus.
Background
In a scanning display system, particularly a high-color-depth scanning display system, the corresponding unit pixel display has a close relationship with the scanning speed, regardless of whether a spiral scanning system, a grid scanning system or a Li Saru scanning system is adopted.
Specifically, in a system based on laser scanning imaging, the size and gray scale of a pixel are controlled by means of the lighting time of laser and the motion track of a light spot, taking raster scanning as an example, because the scanning speed is different, the motion speed of the light spot is smaller at the edge of an image, and the motion speed of the light spot is larger when the light spot is close to the center of the image, so that the pixel size is required to be the same regular square in order not to cause image distortion, when the scanning is close to the center of the image, the lighting time of the laser is shorter, when the light spot is close to the edge of the image, the lighting time of the laser is longer, and the perception of brightness by human eyes is mainly determined by the integration time of light rays in human eyes, so that the prior art of a scanning display system has the following problems: since the scanning speeds are different at the respective positions of the display area, the lighting periods thereof are different in the pixel blocks corresponding to the respective positions, so that the uniformity of the display luminance becomes poor.
Disclosure of Invention
The invention aims to provide an image brightness homogenizing method which solves the problem of poor display brightness uniformity caused by different scanning speeds at various positions of a display area in a scanning display system.
Another object of the present invention is to provide a computer readable storage medium, an electronic device, and a laser projection image processing apparatus, which can ensure that a corresponding display system has a uniform brightness display effect, and which can avoid a high modulation bandwidth requirement caused by using an equal lighting duration in scanning display, and at the same time ensure that a display image has a consistent and sufficient display color depth, so that it can perform color output according to a color depth required by a target.
In order to achieve the above object, the present invention provides an image brightness uniformizing method comprising:
acquiring and processing the gray scale of an original light source and the lighting power data of the original light source of the display system to obtain a color power response curve;
calculating the lighting time lengths corresponding to the pixels distributed in different areas to obtain uncorrected lighting brightness corresponding to the pixels;
obtaining a brightness control table, wherein the brightness control table comprises pixel addresses and brightness adjustment coefficients corresponding to each pixel address, and each brightness adjustment coefficient is as follows: the ratio of the minimum lighting time length with the shortest time in each lighting time length to the corresponding lighting time length of the current pixel;
the uncorrected lighting luminance corresponding to each pixel is modulated in combination with the uncorrected lighting luminance of each pixel and the corresponding luminance control table.
Further, in the preferred embodiment of the present invention, the process of acquiring and processing the gray scale of the original light source and the lighting power data of the original light source of the display system includes:
collecting data from a display system by a power meter, a camera or an illuminometer;
fitting or differencing the acquired data.
Further, in the preferred embodiment of the present invention, the modulating the to-be-corrected lighting brightness corresponding to each pixel includes: the uncorrected lighting luminance corresponding to each pixel is multiplied by the luminance adjustment coefficient corresponding thereto.
Further, in the preferred embodiment of the present invention, the above-mentioned image brightness homogenizing method is applied to a high color depth scanning type display system;
when the image brightness homogenizing method is applied to a high-color-depth scanning type display system, the original color depth is higher than the target color depth, and the ratio of the original color depth to the target color depth and the ratio of the minimum lighting time length to the maximum lighting time length are in negative correlation.
Further, in the preferred embodiment of the present invention, the above-mentioned image brightness homogenizing method is applied to a scanning display system with a spiral, grid or Li Saru scanning mode.
Further, in the preferred embodiment of the present invention, when the above-mentioned image brightness homogenizing method is applied to a scanning display system in which the scanning mode is a grid format, the minimum lighting duration is the lighting duration of the display center pixel.
A computer-readable storage medium, which when processed and executed implements the image brightness homogenizing method as described above.
An electronic device comprising a memory and a processor, wherein the memory comprises the computer-readable storage medium described above.
A laser projection image processing apparatus includes:
the image data module is used for acquiring and processing the display image data to obtain uncorrected lighting brightness corresponding to each pixel;
the brightness control table module comprises pixel addresses and brightness adjustment coefficients corresponding to each pixel address; wherein each brightness adjustment coefficient is: the ratio of the minimum lighting time length with the shortest time in each pixel to the corresponding lighting time length of the current pixel;
and the image data modulation processing module is used for modulating the uncorrected lighting brightness corresponding to each pixel by combining each uncorrected lighting brightness and the brightness control table module.
Further, in a preferred embodiment of the present invention, the image data modulation processing module, when modulating the uncorrected illumination intensity corresponding to each pixel, includes: the uncorrected lighting luminance corresponding to each pixel is multiplied by the luminance adjustment coefficient corresponding thereto.
Compared with the prior art, the invention has the following beneficial effects:
the uncorrected lighting brightness corresponding to each pixel is modulated by adding a brightness adjustment coefficient to each pixel, so that the brightness uniformity of a display system is corrected, and the display brightness is ensured to be uniform; in addition, the invention does not adopt a method of directly modifying the pixel lighting time length to realize the correction of the uniformity of the display brightness, thereby avoiding the requirement of high modulation bandwidth caused by the utilization of the equal lighting time length in the scanning display, ensuring the display image to have consistent and enough display color depth and enabling the display image to carry out color output according to the color depth required by a target.
Drawings
For a clearer description of embodiments of the invention or of solutions in the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being evident that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained, without inventive faculty, by a person skilled in the art from these drawings:
fig. 1 is a schematic diagram of method steps of an image brightness homogenizing method according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
As shown in fig. 1, an embodiment of the present invention provides an image brightness homogenizing method, which includes:
s1, acquiring and processing the gray scale of an original light source and the lighting power data of the original light source of the display system to obtain a color power response curve. It should be noted that, the process of acquiring and processing the gray scale of the original light source and the lighting power data of the original light source of the display system specifically includes: and acquiring data of the display system through a power meter, a camera or an illuminometer, and fitting or differencing the acquired data.
S2, calculating the lighting time lengths corresponding to the pixels distributed in different areas, and obtaining uncorrected lighting brightness corresponding to the pixels. Specifically, by calculating the obtained lighting periods corresponding to the respective pixels, uncorrected lighting luminance corresponding to the respective pixels can be obtained in combination with the lighting power in S1.
S3, acquiring a brightness control table, wherein the brightness control table comprises pixel addresses and brightness adjustment coefficients corresponding to each pixel address, and each brightness adjustment coefficient is as follows: the ratio of the minimum lighting time length with the shortest time in the lighting time length corresponding to each pixel to the lighting time length corresponding to the current pixel. The brightness control table is obtained by determining the corresponding lighting time length of each pixel address according to the obtained row and column index number, and determining the brightness adjustment coefficient according to the lighting time length of each pixel address.
S4, combining the uncorrected lighting brightness of each pixel with a corresponding brightness control table, and modulating the uncorrected lighting brightness corresponding to each pixel. It should be noted that, the modulating the to-be-corrected lighting brightness corresponding to each pixel includes: the uncorrected lighting luminance corresponding to each pixel is multiplied by the luminance adjustment coefficient corresponding thereto.
And finally, the modulated lighting brightness can be projected and displayed on each pixel in sequence according to the pixel address, and a projection image is obtained.
Further, the image brightness homogenizing method provided by the embodiment of the invention is preferably applied to a high-color-depth scanning type display system, and can be applied to a scanning display system with a spiral scanning mode, a grid format or a Li Saru scanning mode and the like. Optionally, when the image brightness homogenizing method provided in the embodiment is applied to a scanning display system with a scanning mode of a grid format, the minimum lighting duration is the lighting duration of the display center pixel. It should be emphasized that, when the image brightness homogenizing method provided by the embodiment of the present invention is applied to a high-color-depth scanning display system, in order to ensure consistency and sufficiency of color depths of each pixel region, it is further defined that an original color depth of each pixel is higher than a corresponding target color depth, and a ratio of the original color depth to the target color depth and a ratio of a minimum lighting duration to a maximum lighting duration are inversely related. By adding the brightness adjustment coefficient and limiting the ratio of the original color depth to the target color depth, the brightness and the color depth of each pixel of the display image are ensured to be uniform, and meanwhile, the display image is ensured to have enough color depth, so that the display image can output colors according to the color depth required by the target.
The applicant has emphasized that, in fact, to achieve uniformity of display brightness, there are at least two kinds of methods in technical direction, that is, uniformity of brightness of each pixel can be achieved by modifying lighting duration of each pixel or lighting power of the light source. If the pixel lighting time length is modified, the lighting time length of all pixels is only required to be set to be the minimum lighting time length, but the technical means brings higher requirements to the modulation bandwidth of the laser light source, and is difficult to be applied to a high-resolution display system.
The embodiment of the invention also provides a computer readable storage medium, and a computer program stored in the computer readable storage medium is processed and executed to realize the image brightness homogenizing method.
The embodiment of the invention also provides electronic equipment which comprises a memory and a processor, wherein the memory comprises the computer readable storage medium.
Correspondingly, the embodiment of the invention also provides a laser projection image processing device, which specifically comprises:
the image data module is used for acquiring and processing the display image data to obtain uncorrected lighting brightness corresponding to each pixel;
and the brightness control table module comprises pixel addresses and brightness adjustment coefficients corresponding to each pixel address. Among them, it is emphasized that each brightness adjustment coefficient is: the ratio of the minimum lighting time length with the shortest time in each pixel to the corresponding lighting time length of the current pixel.
And the image data modulation processing module is used for modulating the uncorrected lighting brightness corresponding to each pixel by combining each uncorrected lighting brightness and the brightness control table module. Specifically, the image data modulation processing module includes, when modulating uncorrected lighting luminance corresponding to each pixel: the uncorrected lighting luminance corresponding to each pixel is multiplied by the luminance adjustment coefficient corresponding thereto.
It should be noted that, the computer readable storage medium, the electronic device and the laser projection image processing apparatus provided by the embodiments of the present invention are essentially product carriers to which the image brightness homogenizing method provided by the present invention is applied, so that the method has the beneficial effects of the image brightness homogenizing method provided by the present invention.
In summary, the image brightness homogenizing method, the computer readable storage medium, the electronic device and the laser projection image processing apparatus provided by the embodiments of the present invention modulate the uncorrected illumination brightness corresponding to each pixel by adding the brightness adjustment coefficient to each pixel, so as to realize the correction of the brightness uniformity of the display system, and ensure the uniformity and consistency of the display brightness; in addition, the invention does not adopt a method of directly modifying the pixel lighting time length to realize the correction of the uniformity of the display brightness, thereby avoiding the requirement of high modulation bandwidth caused by the utilization of the equal lighting time length in the scanning display, ensuring the display image to have consistent and enough display color depth and enabling the display image to carry out color output according to the color depth required by a target.
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (9)
1. An image brightness homogenizing method, wherein the image brightness homogenizing method is applied to a high-color-depth scanning type display system, in the high-color-depth scanning type display system, an original color depth is higher than a target color depth, and a ratio of the original color depth to the target color depth and a ratio of a minimum lighting time length to a maximum lighting time length are in negative correlation, and the method comprises:
acquiring and processing the gray scale of an original light source and the lighting power data of the original light source of the display system to obtain a color power response curve;
calculating the lighting time lengths corresponding to the pixels distributed in different areas to obtain uncorrected lighting brightness corresponding to the pixels;
obtaining a brightness control table, wherein the brightness control table comprises pixel addresses and brightness adjustment coefficients corresponding to each pixel address, and each brightness adjustment coefficient is as follows: the ratio of the minimum lighting time length with the shortest time in each lighting time length to the current corresponding lighting time length of the pixel;
and combining the uncorrected lighting brightness of each pixel with the brightness control table corresponding to the uncorrected lighting brightness of each pixel.
2. The method of claim 1, wherein the process of obtaining and processing raw light source gray scale and raw light source illumination power data of the display system comprises:
collecting data from the display system by a power meter, a camera or an illuminometer;
and fitting or differencing the acquired data.
3. The image luminance uniformizing method according to claim 1, wherein the process of modulating the uncorrected lighting luminance for each of the pixels comprises: multiplying the uncorrected lighting luminance corresponding to each of the pixels by the luminance adjustment coefficient corresponding thereto.
4. A method of homogenizing image brightness according to any one of claims 1-3, wherein the image brightness homogenizing method is applied in a scanning display system with a scanning mode of spiral, grid or Li Saru.
5. The image brightness uniformizing method according to claim 4, wherein the minimum lighting period is a lighting period of a display center pixel when the image brightness uniformizing method is applied to a scanning display system in which a scanning manner is a grid format.
6. A computer-readable storage medium, characterized in that a computer program stored in the computer-readable storage medium, when being processed and executed, implements the image brightness homogenizing method according to any one of claims 1-5.
7. An electronic device comprising a memory and a processor, wherein the memory comprises the computer-readable storage medium of claim 6, and the processor processes and executes a computer program stored in the computer-readable storage medium.
8. A laser projection image processing apparatus, which is applied to a high color depth scanning type display system in which an original color depth is higher than a target color depth and a ratio of the original color depth to the target color depth and a ratio of a minimum lighting period to a maximum lighting period are inversely related, comprising:
the image data module is used for acquiring and processing the display image data to obtain uncorrected lighting brightness corresponding to each pixel;
the brightness control table module comprises pixel addresses and brightness adjustment coefficients corresponding to each pixel address; wherein each of the brightness adjustment coefficients is: the ratio of the minimum lighting time length with the shortest time in each pixel to the corresponding lighting time length of the current pixel;
and the image data modulation processing module is used for modulating the uncorrected lighting brightness corresponding to each pixel by combining each uncorrected lighting brightness with the brightness control table module.
9. The laser projection image processing apparatus according to claim 8, wherein the image data modulation processing module, when modulating the uncorrected lighting luminance for each of the pixels, includes: multiplying the uncorrected lighting luminance corresponding to each of the pixels by the luminance adjustment coefficient corresponding thereto.
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