Automatic white balance adjusting method of intelligent interactive display equipment
Through the built-in Android system and built-in camera of the intelligent interactive display device, low-cost white balance adjustment is achieved, solving the problems of high cost and white balance in the existing technology, and improving the color temperature consistency of the product.
Patent Information
- Application Number
- CN202411672795.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-03-14
AI Technical Summary
The automatic white balance adjustment system of existing intelligent interactive display devices requires imported signal source transmitters and color analysis instruments, which leads to high cost of hardware and software, which is especially difficult for small factories to bear, resulting in poor product quality control and inability to achieve consistency of white balance.
The test picture is output through the built-in Android system of the intelligent interactive display device, the color coordinates are measured using color analysis instruments, and the white balance adjustment is achieved by adjusting the RedGain and BlueGain data in the CSC registers. The built-in camera is used to capture the screen content to obtain standard values, and it is applied to the white balance adjustment in the mass production stage.
It realizes low-cost white balance adjustment, reduces equipment costs, and improves the color temperature consistency of the same batch of products, which is suitable for the mass production needs of small factories.
Smart Images
Figure CN119629323A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of intelligent interactive display devices, and in particular relates to an automatic white balance adjustment method for an intelligent interactive display device. Background Art
[0002] Intelligent interactive display devices refer to devices such as smart electronic whiteboards and smart TVs that integrate intelligent processing capabilities and interactive display functions.
[0003] In the market, manufacturers need to adjust the white balance in the process of manufacturing / producing intelligent interactive display devices to ensure that the white balance of different machines is consistent when the products leave the factory. Conventional automatic white balance adjustment systems require the use of signal source transmitters, color analysis instruments, computers and other equipment. Generally, the signal source is used to send a signal, and the signal color temperature read by the color temperature analyzer is compared with the target color temperature by the computer. According to the color temperature difference, the RedGain, GreenGain, BlueGain, RedOffset, Greenoffset and BlueOffset registers in the machine are repeatedly adjusted through the interface until the color temperature target value is reached and the value is saved. After that, these color temperature parameters can be called when the machine is turned on to complete the color temperature debugging of the machine.
[0004] The drawback of the existing technology is that the signal source transmitter and color analysis instrument generally need to be imported, resulting in high hardware and software costs for the entire system. If the manufacturer has multiple production lines, the cost will double. Small manufacturers simply cannot afford such costs, resulting in poor control of the image quality of their products. The same picture on different machines will show color differences, that is, the consistency of white balance cannot be achieved. Summary of the invention
[0005] The main purpose of the present invention is to provide an automatic white balance adjustment method for an intelligent interactive display device, so as to solve the problems existing in the prior art and realize the white balance adjustment of the intelligent interactive display device at a low cost.
[0006] In order to achieve the above object, the solution of the present invention is: An automatic white balance adjustment method for an intelligent interactive display device, comprising: Step 1, outputting several test pictures through the built-in Android system of the intelligent interactive display device, where the test pictures are full-screen images with different grayscales; using a color analysis instrument to measure the color coordinates of different test pictures in the middle of the screen of the intelligent interactive display device, and comparing the color coordinates measured for each test picture, if the color coordinate difference measured for each test picture is less than a preset threshold, proceed to step 2, otherwise perform GAMMA adjustment; Step 2, output the first picture of the 80IRE gray field through the built-in Android system of the intelligent interactive display device, and control the real-time color temperature of the 80IRE gray field within the error range of the target color temperature by adjusting the RedGain and BlueGain data in the CSC register; then switch the first picture to the 20IRE and 50IRE gray fields in turn, and control the real-time color temperature of the corresponding gray fields within the error range of the target color temperature by adjusting the RedGain and BlueGain data in the CSC register; if the 50IRE gray field cannot meet the requirements, switch back to the 80IRE and 20IRE gray fields to make fine adjustments to the color temperature until all three gray fields meet the color temperature error requirements, and then save the data of the RedGain, GreenGain, BlueGain, RedOffset, Greenoffset and BlueOffset registers as default values; Step 3, the second pictures of 20IRE, 50IRE and 80IRE gray fields are outputted respectively by the built-in Android system of the intelligent interactive display device, the display content of the current screen is captured by the camera, and the Android system reads the data of Red, Green, Blue and Whtie components corresponding to the screen display content under different gray fields respectively; these data are saved as the judgment criteria when the camera reads the gray field picture later; Step 4: Use the default values of the RedGain, GreenGain, BlueGain, RedOffset, Greenoffset and BlueOffset registers saved in step 2 and the data of the Red, Green, Blue and Whtie components saved in step 3 to adjust the white balance of machines with the same screen and the same model in the mass production stage. The screen display content is also captured using a camera in the mass production stage.
[0007] In step 1, the output full-screen image has a total of 16 gradients from full black to full white.
[0008] In step 1, the preset threshold of the color coordinate difference is manually set and adjusted.
[0009] In step 3, the camera is built into the intelligent interactive display device or is connected to the intelligent interactive display device signal via a data cable.
[0010] In step 4, the steps of adjusting the white balance in the mass production stage are specifically: The Android system built into the smart interactive display device to be tested outputs the third image of several gray fields, and then the built-in or external camera of the smart interactive display device captures the display content of the current screen, and the Android system reads the data of Red, Green, Blue and Whtie components corresponding to the screen display content under different gray fields respectively; then compare these data with the data saved in step 3, if the color temperature error can be met, debug the next device, otherwise adjust the real-time color temperature of the corresponding gray field by adjusting the RedGain and BlueGain data in the CSC register to meet the color temperature error.
[0011] After adopting the above technical solution, the present invention has the following technical effects: The present invention uses the built-in Android system of the intelligent interactive display device as a signal source transmitter, and the camera captures the screen display content. Through corresponding steps, the "standard value" for white balance adjustment can be obtained, and then the "standard value" can be applied to the white balance adjustment in the mass production stage. The white balance adjustment can be performed using the cameras of the same batch of the manufacturer, which is convenient for batch debugging and cost control, and effectively improves the color temperature consistency of the same batch of products. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 The figure is a signal flow chart of a specific embodiment of the present invention. DETAILED DESCRIPTION
[0013] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.
[0014] Smart interactive display devices such as smart electronic whiteboards and smart TVs generally have Android systems and can output different test screens by themselves. Therefore, the built-in picture of the smart interactive display device can be used as the signal source, and the current screen picture can be captured with an external camera or a built-in camera. Then the color of the captured picture is compared and analyzed with the target color, and then the RedGain, GreenGain, BlueGain, RedOffset, Greenoffset and BlueOffset registers of the machine are adjusted as needed until the color temperature target value is reached and the value is saved. After that, these color temperature parameters can be called when the machine is turned on to complete the color temperature debugging of the machine. In this way, a lot of equipment costs can be saved.
[0015] refer to Figure 1 , shows a signal flow chart of a specific embodiment of the present invention, and the specific terms are explained as follows: Camera input - connect the camera to the machine via the USB interface; Video processing – decoding the video data stream; Data reading and analysis——Read and analyze the Red / Green / Blue / White values of the currently specified coordinate image; CSC White Balance Adjustment – Control / adjust RedGain, GreenGain, BlueGain, RedOffset, Greenoffset and BlueOffset registers to achieve white balance adjustment; Image quality enhancement - image quality processing such as noise reduction / bevel / motion / color, etc., which needs to be turned off when adjusting white balance so as not to affect the original data; GAMMA——Make GAMMA adjustments to the displayed data; Display interface——drives PANEL for display.
[0016] Specifically, the present invention discloses an automatic white balance adjustment method for an intelligent interactive display device, comprising: Step 1, outputting several test pictures through the built-in Android system of the intelligent interactive display device, where the test pictures are full-screen images with different grayscales; using a color analysis instrument to measure the color coordinates of different test pictures in the middle of the screen of the intelligent interactive display device, and comparing the color coordinates measured for each test picture, if the color coordinate difference of each test picture is less than a preset threshold, proceed to step 2, otherwise perform GAMMA adjustment to make the color temperature of each gray field close to the same; Step 2: Output the first image of the 80IRE gray field through the built-in Android system of the intelligent interactive display device, and control the real-time color temperature of the 80IRE gray field within the error range of the target color temperature by adjusting the RedGain and BlueGain data in the CSC register. For example, if the target color temperature is 1000K (X=0.280 Y=0.290), the error range is X±10, Y±10; then switch the first image to the 20IRE and 50IRE gray fields in turn, and control the real-time color temperature of the corresponding gray fields within the error range of the target color temperature by adjusting the RedGain and BlueGain data in the CSC register; if the 50IRE gray field cannot meet the requirements, switch back to the 80IRE and 20IRE gray fields to fine-tune the color temperature until all three gray fields meet the color temperature error requirements, and then save the data of the RedGain, GreenGain, BlueGain, RedOffset, Greenoffset and BlueOffset registers as default values; Step 3, the second pictures of 20IRE, 50IRE and 80IRE gray fields are outputted respectively by the built-in Android system of the intelligent interactive display device, the display content of the current screen is captured by the camera, and the Android system reads the data of Red, Green, Blue and Whtie components corresponding to the screen display content under different gray fields respectively; these data are saved as the judgment criteria when the camera reads the gray field picture later; Step 4: Use the default values of the RedGain, GreenGain, BlueGain, RedOffset, Greenoffset and BlueOffset registers saved in step 2 and the data of the Red, Green, Blue and Whtie components saved in step 3 to adjust the white balance of machines with the same screen and the same model in the mass production stage. The screen display content is also captured using a camera in the mass production stage.
[0017] Through the above scheme, the present invention uses the built-in Android system of the intelligent interactive display device as a signal source transmitter, and the camera captures the screen display content. Through corresponding steps, the "standard value" for white balance adjustment can be obtained, and then the "standard value" can be applied to the white balance adjustment in the mass production stage. The white balance adjustment can be performed using the cameras of the same batch of the manufacturer, which is convenient for batch debugging and cost control, and effectively improves the color temperature consistency of the same batch of products.
[0018] Specific embodiments of the present invention are shown below.
[0019] In the above step 1, the output full-screen image has a total of 16 gradients from completely black to completely white.
[0020] In the above step 1, the preset threshold of the color coordinate difference is manually set and adjusted. The smaller the preset threshold is, the better the final white balance adjustment effect is.
[0021] The first picture and the second picture in the above steps 2 and 3 may be the same picture or different pictures, and the pictures in the same step only need to be the same, so as to eliminate interference variables.
[0022] In the above step 3, the camera is built into the intelligent interactive display device or is connected to the intelligent interactive display device signal via a data cable such as a USB.
[0023] In step 4 above, the steps for adjusting the white balance in the mass production stage are as follows: The Android system built into the smart interactive display device to be tested outputs the third picture of several gray fields, and then the built-in or external camera of the smart interactive display device captures the display content of the current screen, and the Android system reads the data of Red, Green, Blue and Whtie components corresponding to the screen display content under different gray fields respectively; then compare these data with the data saved in step 3, if the color temperature error can be met, debug the next device, otherwise adjust the RedGain and BlueGain data in the CSC register to adjust the real-time color temperature of the corresponding gray field to meet the color temperature error (the error here can be X±5, Y±5).
[0024] Furthermore, when the white balance is adjusted in the mass production stage, the output gray field may also be 20IRE, 50IRE, or 80IRE, but is not limited to these specific gray fields.
[0025] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.
Claims
1. A method for automatically adjusting white balance of an intelligent interactive display device, characterized in that include: Step 1: Output several test pictures through the built-in Android system of the intelligent interactive display device, where the test pictures are full-screen images with different grayscales; Use a color analysis instrument to measure the color coordinates of different test pictures in the middle of the screen of the intelligent interactive display device, and compare the color coordinates measured for each test picture. If the color coordinate difference of each test picture is less than a preset threshold, proceed to step 2, otherwise perform GAMMA adjustment; Step 2, output the first picture of the 80IRE gray field through the built-in Android system of the intelligent interactive display device, and control the real-time color temperature of the 80IRE gray field within the error range of the target color temperature by adjusting the RedGain and BlueGain data in the CSC register; then switch the first picture to the 20IRE and 50IRE gray fields in turn, and control the real-time color temperature of the corresponding gray fields within the error range of the target color temperature by adjusting the RedGain and BlueGain data in the CSC register; if the 50IRE gray field cannot meet the requirements, switch back to the 80IRE and 20IRE gray fields to make fine adjustments to the color temperature until all three gray fields meet the color temperature error requirements, and then save the data of the RedGain, GreenGain, BlueGain, RedOffset, Greenoffset and BlueOffset registers as default values; Step 3, the second pictures of 20IRE, 50IRE and 80IRE gray fields are outputted respectively by the built-in Android system of the intelligent interactive display device, the display content of the current screen is captured by the camera, and the Android system reads the data of Red, Green, Blue and Whtie components corresponding to the screen display content under different gray fields respectively; these data are saved as the judgment criteria when the camera reads the gray field picture later; Step 4: Use the default values of the RedGain, GreenGain, BlueGain, RedOffset, Greenoffset and BlueOffset registers saved in step 2 and the data of the Red, Green, Blue and Whtie components saved in step 3 to adjust the white balance of machines with the same screen and the same model in the mass production stage. The screen display content is also captured using a camera in the mass production stage.
2. The automatic white balance adjustment method of the intelligent interactive display device according to claim 1, characterized in that: In step 1, the output full-screen image has a total of 16 gradients from full black to full white.
3. The automatic white balance adjustment method of the intelligent interactive display device according to claim 1, characterized in that: In step 1, the preset threshold of the color coordinate difference is manually set and adjusted.
4. The automatic white balance adjustment method of the intelligent interactive display device according to claim 1, characterized in that: In step 3, the camera is built into the intelligent interactive display device or is connected to the intelligent interactive display device signal via a data cable.
5. The automatic white balance adjustment method of the intelligent interactive display device according to claim 1, characterized in that: In step 4, the steps of adjusting the white balance in the mass production stage are specifically: The Android system built into the smart interactive display device to be tested outputs the third image of several gray fields, and then the built-in or external camera of the smart interactive display device captures the display content of the current screen, and the Android system reads the data of Red, Green, Blue and Whtie components corresponding to the screen display content under different gray fields respectively; then compare these data with the data saved in step 3, if the color temperature error can be met, debug the next device, otherwise adjust the real-time color temperature of the corresponding gray field by adjusting the RedGain and BlueGain data in the CSC register to meet the color temperature error.