CN117176929A - Projection contrast enhancement method and device - Google Patents
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Abstract
The application relates to a projection contrast enhancement method and a device, and relates to the technical field of image processing; analyzing the brightness information of each frame of image to obtain an analysis result; and adjusting the light source brightness of each frame of image according to the analysis result, and outputting the adjusted each frame of image to a display terminal for display. The application has the effect of improving the brightness adjusting precision in the projection process.
Description
Technical Field
The present application relates to the field of image processing technologies, and in particular, to a method and an apparatus for enhancing projection contrast.
Background
With the continuous development of projection technology, the brightness index of the projection system is continuously improved, and the higher brightness means that the black background brightness value of the dark field picture of the projection system is higher, so that the detail of the dark field picture is displayed worse, and bad experience is brought to people in the process of watching the shadow, so how to improve the intra-frame contrast of the projection system becomes an important problem for research of technicians in the field.
Most of the related technologies adopt a mode of manually adjusting a projector to adjust projection brightness, so that the problem of low adjustment precision exists in the mode of manually adjusting the projector.
Disclosure of Invention
The application aims to provide a projection contrast enhancement method for improving brightness adjustment precision in a projection process.
In a first aspect, the present application provides a projection contrast enhancement method, which adopts the following technical scheme:
a projection contrast enhancement method, comprising:
acquiring brightness information of each frame of image;
analyzing the brightness information of each frame of image to obtain an analysis result;
and adjusting the light source brightness of each frame of image according to the analysis result, and outputting the adjusted each frame of image to a display terminal for display.
By adopting the technical scheme, the brightness information of each frame of image is firstly obtained, then the brightness information of each frame of image is analyzed, and the brightness of a light source of each frame of image is regulated according to the analysis result; therefore, the effect of dynamically adjusting the light source brightness of the image according to different brightness information of the image can be achieved, and the accuracy of adjusting the light source brightness of the image is improved.
Optionally, before the acquiring the brightness information of each frame of image, the method includes:
judging whether playing of the target video is finished or not;
if the playing of the target video is finished, stopping acquiring the target video;
and if the playing of the target video is not finished, video stream interception is carried out on the target video to obtain each frame of image.
By adopting the technical scheme, whether the target video is played is judged to be finished before the brightness information of each frame of image is obtained, when the target video is played to be finished, the target video is stopped to be obtained, when the target video is not played to be finished, the video stream interception is carried out on the target video, each frame of image is finally obtained, and then whether the target video is obtained can be selected according to the actual playing condition, and then the video stream interception is carried out on the target video so as to avoid the increase of the obtaining operation of the target video.
Optionally, the acquiring the brightness information of each frame of image includes:
processing each frame of image according to a preset rule to obtain a gray level image corresponding to each frame of image;
and acquiring a pixel value of each pixel point of the gray image, and calculating to obtain a brightness value of the gray image according to the pixel value of each pixel point.
By adopting the technical scheme, the brightness value of the gray level image is conveniently obtained by processing each frame of image into the corresponding gray level image and then according to the pixel value of each pixel point of the gray level image, thereby conveniently providing a basis for adjusting the light source brightness of each frame of image.
Optionally, the analyzing the brightness information of each frame of image to obtain an analysis result specifically includes:
judging whether the brightness value of the gray image is larger than or equal to a brightness threshold value;
if the brightness value of the gray level image is greater than or equal to the brightness threshold value, the light source brightness of each frame of image corresponding to the gray level image is determined to be in a first state;
and if the brightness value of the gray level image is smaller than the brightness threshold value, determining that the light source brightness of each frame of image corresponding to the gray level image is in a second state.
By adopting the technical scheme, the state of the light source brightness of each frame of image is conveniently judged by judging whether the brightness value of the gray level image is larger than or equal to the brightness threshold value.
Optionally, the adjusting the light source brightness of each frame of image according to the analysis result specifically includes:
if the light source brightness of each frame of image corresponding to the gray level image is in the first state, the current input current of each frame of image corresponding to the gray level image is regulated to a preset input current;
and if the light source brightness of each frame of image corresponding to the gray level image is in the second state, reducing the current input current of each frame of image corresponding to the gray level image.
By adopting the technical scheme, when the light source brightness of each frame image is in the first state, the current input current of each frame image can be adjusted to the preset input current, and when the light source brightness of each frame image is in the second state, the current input current of each frame image can be reduced, so that different adjustments can be realized on the current input current according to the light source brightness state of each frame image, and the contrast of the black scene of each frame image can be improved.
Optionally, after the adjusted each frame of image is output to the display terminal for display, the gray scale image corresponding to each frame of image automatically disappears.
By adopting the technical scheme, after each frame of adjusted image is output to the display terminal for display, the gray level image corresponding to each frame of image automatically disappears, so that the system memory can be saved.
Optionally, the processing time for processing each frame of image is between 0.001 ms and 0.005 ms.
By adopting the technical scheme, the processing time for processing each frame of image is between 0.001 and 0.005ms, and the playing time of the target video cannot be influenced due to the short processing time.
In a second aspect, the present application provides a projection contrast enhancement device, which adopts the following technical scheme:
a projection contrast enhancement apparatus employing the method of the first aspect, comprising:
the acquisition module is used for acquiring the brightness information of each frame of image;
the analysis module is used for analyzing the brightness information of each frame of image to obtain an analysis result;
and the execution module is used for adjusting the light source brightness of each frame of image according to the analysis result and outputting the adjusted each frame of image to a display terminal for display.
By adopting the technical scheme, the brightness information of each frame of image is firstly acquired by the acquisition module, then the brightness information of each frame of image is analyzed by the analysis module, and the light source brightness of each frame of image is adjusted by the execution module according to the analysis result; therefore, the effect of dynamically adjusting the light source brightness of the image according to different brightness information of the image can be achieved, and the accuracy of adjusting the light source brightness of the image is improved.
In a third aspect, the present application provides a terminal, which adopts the following technical scheme:
a terminal comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, the processor performing the method of the first aspect when the computer program is loaded.
By adopting the technical scheme, the method of the first aspect generates a computer program and stores the computer program in the memory to be loaded and executed by the processor, so that a user can establish a connection with the device through the terminal and inquire about various contents processed by the device.
In a fourth aspect, the present application provides a computer readable storage medium, which adopts the following technical scheme:
a computer readable storage medium having stored therein a computer program which, when loaded by a processor, performs the method of the first aspect.
By adopting the technical scheme, the method of the first aspect generates a computer program and stores the computer program in a computer readable storage medium, and after the computer readable storage medium is loaded into any computer, any computer can execute the method of the first aspect.
Drawings
FIG. 1 is a flow chart of a method of steps S100-S300 in an embodiment of the application;
FIG. 2 is a flow chart of a method of steps Sa-Sc in an embodiment of the application;
FIG. 3 is a flow chart of processing each frame of image in an embodiment of the application;
FIG. 4 is a flow chart of a method of steps S110-S120 in an embodiment of the application;
FIG. 5 is a flow chart of a method of steps S210-S230 in an embodiment of the application;
FIG. 6 is a flow chart of a method of steps S310-S320 in an embodiment of the application;
FIG. 7 is a block diagram of a projection contrast enhancement apparatus of the present application;
in the figure, 1, an acquisition module; 2. an analysis module; 3. and executing the module.
Detailed Description
The present application will be described in further detail with reference to fig. 1 to 7.
Existing projectors are classified into the following categories according to application environments:
1. home theater type: the method is characterized in that the brightness is about 2000 lumen (the number is continuously increased along with the development of projection, the contrast ratio is higher), the picture width ratio of projection is 16:9, various video ports are complete, and the method is suitable for playing movies and high-definition televisions and is suitable for home users.
2. Portable commercial projector: generally, a projector with a weight lower than 2 kg is defined as a commercial portable projector, and the weight is different from that of a light and thin notebook computer, so that the commercial portable projector has the advantages of small volume, light weight and strong mobility, is a substitute for a traditional slide projector and a large and medium projector, and is a preferred match for mobile commercial users when carrying out mobile commercial demonstration.
3. Educational conference projector: the LED lamp is generally positioned in schools and enterprises, adopts main flow resolution, has the brightness of about 2000-3000 lumens, is moderate in weight, has good heat dissipation and dust prevention effects, is suitable for installation and short-distance movement, has rich functional interfaces, is easy to maintain, has relatively high cost performance, and is suitable for mass purchasing and popularization.
4. Mainstream engineering projector: compared with the mainstream common projector, the project projector has larger projection area, longer distance and higher brightness, generally supports a multi-bulb mode, can better cope with large and changeable installation environments, and is very practical in the fields of education, media, government and the like.
5. Professional theatre projector: the projector is more focused on stability, emphasizes low failure rate, has strong heat dissipation performance, network function, portability in use and the like, is of course, has the most important characteristics of high brightness in order to adapt to various professional application occasions, has the brightness of more than 5000 lumens, has the brightness of more than 10000 lumens, is large in size and heavy in weight, is commonly used in special purposes, such as theatres, museums, large meetings and public areas, and can be applied to environments such as traffic monitoring, public security command centers, fire protection and aviation traffic control centers and the like.
6. Measurement projector: unlike the above projectors, the projectors are called profile projectors in early days, with the popularization of grating scales, the projectors are all provided with high-precision grating scales, so that people just called measuring projectors (or projectors, such as the domestic well-known measuring projectors, which have CPJ-3015 produced by the high-integrity company), are distinguished from traditional projectors, and the projectors are mainly used for forming amplified projectors by transmitting light through product parts, and then the size of the products is determined by using standard films or grating scales, and the like.
However, the above-mentioned projectors are manually adjusted when adjusting the brightness, and thus have a problem that the adjustment accuracy is not high.
In the projection field, the larger the output power of a light source is, the brighter the picture displayed by a display terminal is, the whiter the black scene is displayed, the black scene is insufficient to be black, and the impression experience is poor.
The embodiment of the application discloses a projection contrast enhancement method, referring to fig. 1, comprising the following steps:
s100: luminance information of each frame image is acquired.
In one embodiment of the present application, referring to fig. 2 and 3, before executing step S100, the present application includes the following steps:
sa: and judging whether the playing of the target video is finished.
In this embodiment, the image input control program is integrated on the controller of the projector, so that the loading of the image input control program can be controlled according to the manual setting, so as to determine whether the input of the target video needs to be stopped, and of course, whether the input of the target video needs to be stopped can also be determined according to whether the input target video has a playing fault.
In this embodiment, when there is a playback failure of the target video, for example, playback is stuck, the playback of the target video may be automatically stopped.
Sb: and stopping obtaining the target video if the playing of the target video is finished.
Sc: and if the playing of the target video is not finished, carrying out video stream interception on the target video to obtain each frame of image.
In this embodiment, according to a conventional video stream capturing program, a video stream capturing is performed on a target video, and a Canvas is used to analyze a captured image, so as to obtain each frame of image.
Furthermore, by judging whether to end playing the target video before the brightness information of each frame of image is acquired, whether to acquire the target video can be selected according to the actual playing condition, and then video stream interception is performed on the target video so as to avoid increasing the acquisition operation of the target video without any reason.
In one embodiment of the present application, referring to fig. 3 and 4, step S100 specifically includes the following steps:
s110: and processing each frame of image according to a preset rule to obtain a gray level image corresponding to each frame of image.
In this embodiment, the processing time for processing each frame of image is between 0.001 ms and 0.005ms, and the processing time is very short, so that the playing time of the target video is not affected.
In this embodiment, the images are divided into color images and gray images, and when the brightness of the images is analyzed, the color images need to be converted into gray images.
In this embodiment, taking an RGB liquid crystal display as an example, the principle of displaying an image is as follows: each pixel point consists of three sub-pixels of R (red), G (green) and B (blue), and the human eye can recognize different colors combined by the three primary colors because of the difference of the sensitivity of the human eye to the R, G, B three primary colors. In the field of color display, there is also a parameter called saturation which describes the similarity between colors and standard colors. When the saturation of the three primary colors R, G, B and the combined cyan, violet and yellow colors is reduced to zero, the distinguishing degree of the six colors is reduced to zero, and the human eyes cannot distinguish the R, G, B three primary colors on the picture displayed by the liquid crystal display. That is, for the human eye, the effect of R, G, B displayed on the display is no distinct color signal, which is consistent with the gray scale display, i.e., the RGB format of the image is converted to YUV format.
In this embodiment, when each frame image is converted into a grayscale image, specifically, it may include:
and reducing the saturation of each primary color in each frame of image to zero to form an image without color distinction, and outputting the image without color distinction to obtain a gray level image corresponding to each frame of image.
Among them, currently, color displays in RGB format (three primary colors) are popular, and displays in RGBY format (four primary colors) and RYGCB format (five primary colors) are also popular. The conversion can be performed in the above manner regardless of how many primary colors the color display uses; and the technology for converting color images into gray-scale images is well known in the art, and will not be described in detail herein.
S120: and acquiring a pixel value of each pixel point of the gray image, and calculating the brightness value of the gray image according to the pixel value of each pixel point.
The brightness of the image refers to the size of the image pixel, the larger the pixel value is, the brighter the image is at the pixel point, otherwise, the smaller the pixel value is, the darker the image is at the pixel point, and the brightness value of the gray image can be calculated according to the obtained pixel value of each pixel point.
In the present embodiment, in the video processing, the image signal is transmitted in two formats, one is RGB, the other is YUV, each pixel of the image in RGB format contains values of R, G, B three primary colors, Y in YUV represents brightness, U and V in YUV represent chromaticity, and when U and V are zero, the image is gray. The YUV image format contains Y, U, V three values, the luminance value is the value of Y, the average luminance is the value of Y of all pixels in a frame of image, and since the data is transmitted, no additional matching luminance value is needed, which is an attribute of the image itself, all that is needed is to convert the RGB format into the YUV format, and then extract the corresponding luminance value.
In this embodiment, the conversion between YUV and RGB is labeled correspondingly, and common standards include ITU-rbt.601 (SDTV), ITU-rbt.709 (HDTV), and ITU-rbt.2020 (UHDTV); the projector supports all the standards, so that different conversion modes are adopted according to different incoming signals, after Y values of YUV are obtained, all Y values of all pixels are added up and averaged to obtain average brightness, and the brightness value of the gray image in the embodiment is the average brightness of the gray image; the calculation of the brightness value of the gray-scale image is well known in the art, and therefore will not be described in detail herein.
For example, the luminance value of each pixel point in the gray image is represented by a value, the value range is 0-255,0 represents black, 255 represents white, other values between 0-255 represent gray between black and white, and then all the luminance values are added and divided by the total pixel number, so that the average luminance is obtained, which is the luminance value of the gray image in this embodiment.
S200: and analyzing the brightness information of each frame of image to obtain an analysis result.
In one embodiment of the present application, referring to fig. 5, step S200 specifically includes the following steps:
s210: and judging whether the brightness value of the gray image is larger than or equal to a brightness threshold value.
The brightness threshold is generally expressed in another concept, APL (Average Picture Luminance)% or ADL (Average Display Luminance)%, and is set according to the actual rendering effect of the image in this embodiment.
S220: and if the brightness value of the gray level image is greater than or equal to the brightness threshold value, determining that the light source brightness of each frame of image corresponding to the gray level image is in a first state.
S230: and if the brightness value of the gray level image is smaller than the brightness threshold value, determining that the light source brightness of each frame of image corresponding to the gray level image is in the second state.
The brightness value of the gray level image is judged to be greater than or equal to the brightness threshold value, so that the state of the light source brightness of each frame of image is conveniently judged, and further, a basis is conveniently provided for subsequent brightness adjustment.
S300: and adjusting the light source brightness of each frame of image according to the analysis result, and outputting each adjusted frame of image to a display terminal for display.
In one embodiment of the present application, referring to fig. 6, the step S300 of adjusting the brightness of the light source of each frame image according to the analysis result specifically includes the following steps:
s310: and if the light source brightness of each frame of image corresponding to the gray level image is in the first state, regulating the current input current of each frame of image corresponding to the gray level image to a preset input current.
The preset input current in this embodiment is the current corresponding to the projector when the projector is started, and the current input current in this embodiment is smaller than or equal to the preset input current.
In this embodiment, when the projector is started, there is a default set brightness, and the set brightness changes with the current value; and adjusting the current input current to a preset input current, namely, restoring the current input current to an initial default current, namely, restoring the brightness of each frame of image corresponding to the gray level image to the initial light source brightness, wherein the light source brightness in the initial state of the image is not improved.
S320: and if the light source brightness of each frame of image corresponding to the gray level image is in the second state, reducing the current input current of each frame of image corresponding to the gray level image.
In this embodiment, the current input current is reduced, that is, the light source brightness of each frame of image corresponding to the gray level image is reduced, so that the input current is reduced at a place with more black scenes, so that each frame of image corresponding to the gray level image is darker, and has higher contrast, thereby improving the viewing experience.
In this embodiment, the brightness achieved by using the same parameters is different depending on the performance of the optical device used, regardless of whether it is a linear light source or a curved light source, but the larger the current, the brighter the light source is within the range in which the maximum current adjustment is allowed; the light source has own brightness specification in an initial state; adjusting the current according to the condition of the light source is generally selected to be adjusted to a maximum adjustable value, and after the threshold value is met, the value reduces the brightness to 50% of the original brightness parameter; in this embodiment, the luminance meter is used for measuring the full black picture, and the luminance meter display value is 1.0lx before the processing, and is 0.6lx after the processing.
In this embodiment, the current input current of each frame of image corresponding to the gray level image is reduced by 0-50%.
In this embodiment, after each adjusted frame of image is output to the display terminal for display, the gray-scale image corresponding to each frame of image will automatically disappear, so that the system memory can be saved.
The implementation principle of the embodiment of the application is as follows: firstly judging whether playing of the target video is finished, when the playing of the target video is not finished, intercepting the target video to obtain each frame of image, processing each frame of image to obtain a gray level image corresponding to each frame of image, calculating a brightness value of the gray level image, analyzing and determining a light source brightness state of each frame of image according to the obtained brightness value, adjusting the light source brightness of each frame of image according to the light source brightness state of each frame of image, and outputting each adjusted frame of image to a display terminal for display.
The embodiment of the application discloses a projection contrast enhancement device, which adopts the projection contrast enhancement method of the embodiment when being applied specifically, and referring to fig. 7, the device specifically comprises an acquisition module 1, an analysis module 2 and an execution module 3; wherein, the brightness information of each frame of image can be acquired by the acquisition module 1; the brightness information of each frame of image can be analyzed by the analysis module 2, and an analysis result is obtained; and adjusting the light source brightness of each frame of image by means of the execution module 3 according to the analysis result, and outputting each adjusted frame of image to a display terminal for display.
In one embodiment of the present application, since the projection contrast enhancement device adopts the projection contrast enhancement method of the above embodiment in specific applications, specific details of the projection contrast enhancement device are not described herein.
The embodiment of the application discloses a terminal, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the projection contrast enhancement method of the embodiment is executed when the processor loads the computer program.
In one embodiment of the present application, the terminal may be a desktop computer, a notebook computer, or a cloud server, and the terminal includes, but is not limited to, a processor and a memory, for example, the terminal may further include an input/output device, a network access device, a bus, and the like.
In one embodiment of the present application, the processor may be a Central Processing Unit (CPU), and of course, other general purpose processors, digital Signal Processors (DSP), application Specific Integrated Circuits (ASIC), off-the-shelf programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. may also be used according to actual usage, and the general purpose processor may be a microprocessor or any conventional processor, etc., which is not limited by the present application.
In one embodiment of the present application, the memory may be an internal storage unit of the terminal, for example, a hard disk or a memory of the terminal, or may be an external storage device of the terminal, for example, a plug-in hard disk, a Smart Memory Card (SMC), a secure digital card (SD), or a flash memory card (FC) equipped on the terminal, etc., and the memory may also be a combination of the internal storage unit of the terminal and the external storage device, where the memory is used to store a computer program and other programs and data required by the terminal, and the memory may also be used to temporarily store data that has been output or is to be output, which is not limited by the present application.
By setting the terminal, the projection contrast enhancement method of the embodiment is stored in a memory of the terminal and is loaded on a processor of the terminal, so that a user can establish a connection with the device through the terminal and inquire various contents processed by the device.
The embodiment of the application discloses a computer readable storage medium, and a computer program is stored in the computer readable storage medium, wherein the projection contrast enhancement method of the embodiment is executed when the computer program is loaded by a processor.
In one embodiment of the present application, the computer program may be stored in a computer readable storage medium, where the computer program includes computer program code, where the computer program code may be in a source code form, an object code form, an executable file form, or some middleware form, etc., and the computer readable storage medium includes any entity or device capable of carrying the computer program code, a recording medium, a usb disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a Random Access Memory (RAM), an electrical carrier signal, a telecommunication signal, a software distribution medium, etc., where the computer readable storage medium includes, but is not limited to, the above components.
By setting the computer readable storage medium, the projection contrast enhancement method of the above embodiment is stored in the computer readable storage medium and loaded on the processor, and after the computer readable storage medium is loaded into any computer, any computer can execute the projection contrast enhancement method of the above embodiment.
The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application, wherein like reference numerals are used to refer to like elements throughout. Therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. A method of projection contrast enhancement, comprising:
acquiring brightness information of each frame of image;
analyzing the brightness information of each frame of image to obtain an analysis result;
and adjusting the light source brightness of each frame of image according to the analysis result, and outputting the adjusted each frame of image to a display terminal for display.
2. The projection contrast enhancement method according to claim 1, comprising, before said acquiring luminance information of each frame image:
judging whether playing of the target video is finished or not;
if the playing of the target video is finished, stopping acquiring the target video;
and if the playing of the target video is not finished, video stream interception is carried out on the target video to obtain each frame of image.
3. The projection contrast enhancement method according to claim 2, wherein the acquiring the brightness information of each frame image includes:
processing each frame of image according to a preset rule to obtain a gray level image corresponding to each frame of image;
and acquiring a pixel value of each pixel point of the gray image, and calculating to obtain a brightness value of the gray image according to the pixel value of each pixel point.
4. The projection contrast enhancement method according to claim 3, wherein the analyzing the brightness information of each frame of image to obtain the analysis result specifically comprises:
judging whether the brightness value of the gray image is larger than or equal to a brightness threshold value;
if the brightness value of the gray level image is greater than or equal to the brightness threshold value, the light source brightness of each frame of image corresponding to the gray level image is determined to be in a first state;
and if the brightness value of the gray level image is smaller than the brightness threshold value, determining that the light source brightness of each frame of image corresponding to the gray level image is in a second state.
5. The projection contrast enhancement method according to claim 4, wherein the adjusting the light source brightness of each frame of image according to the analysis result specifically comprises:
if the light source brightness of each frame of image corresponding to the gray level image is in the first state, the current input current of each frame of image corresponding to the gray level image is regulated to a preset input current;
and if the light source brightness of each frame of image corresponding to the gray level image is in the second state, reducing the current input current of each frame of image corresponding to the gray level image.
6. The projection contrast enhancement method according to claim 5, wherein the gray-scale image corresponding to each frame image automatically disappears after the adjusted each frame image is output to the display terminal for display.
7. The projection contrast enhancement method according to any one of claims 3-6, wherein the processing time for processing each frame of image is between 0.001-0.005 ms.
8. A projection contrast enhancement apparatus, characterized in that a method according to any of claims 1-7 is used, comprising:
the acquisition module is used for acquiring the brightness information of each frame of image;
the analysis module is used for analyzing the brightness information of each frame of image to obtain an analysis result;
and the execution module is used for adjusting the light source brightness of each frame of image according to the analysis result and outputting the adjusted each frame of image to a display terminal for display.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, characterized in that the processor performs the method of any of claims 1-7 when the computer program is loaded by the processor.
10. A computer readable storage medium having a computer program stored therein, characterized in that the computer program, when loaded by a processor, performs the method of any of claims 1-7.
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