A projection system automatic white balance debugging method, device and storage medium

Abstract

The present invention discloses a method, device and storage medium for automatic white balance debugging of a projection system, the method comprising: setting a projector to a high brightness mode, connecting the projector to an illuminance meter, and turning on the illuminance meter; making the projector play red, green, blue and white images in sequence; querying and receiving the illuminance values ​​and color coordinate data obtained and returned by the illuminance meter when measuring each image; after judging that the illuminance values ​​of the red, green and blue pure color images respectively reach the preset illuminance value specifications, then comparing the illuminance and color coordinate data of the currently received red, green, blue and white images with the preset white balance combination parameters, writing the qualified white balance combination parameters into the data registers corresponding to all channel image processing; calling the new white balance parameters to replay the white image, and confirming that the luminous flux and white balance meet the preset specification requirements, then the white balance debugging is finished. The whole debugging system of the present invention has simple composition, fast debugging speed, low cost and good consistency.

Description

Technical Field

[0001] The present invention relates to the field of projector display technology, and in particular to a projection system automatic white balance debugging method, device and storage medium. Background Art

[0002] Projectors, especially micro projectors, are increasingly being used due to their portability and good compatibility with the Android system they carry. As the market expands, users' requirements for image quality increase accordingly. White balance parameter adjustment and image brightness, which are basic requirements for image reproduction, should also develop in line with user needs.

[0003] Currently, the white balance adjustment of projectors is difficult to debug and has poor consistency due to the particularity of their image display compared to CRT and LCD display devices. Some products use manual adjustment and human eye judgment. Different debuggers and different emotional states can affect the final debugging result of the white balance, which may lead to an abnormal decrease in luminous flux and abnormal temperature rise of the optical machine. Figure 1 This is a system construction block diagram of a dedicated white balance debugging system used in current products during white balance debugging. The system composition of the prior art includes: a debugged projector, a work computer (computer system and the white balance debugging system software / hardware contained therein), a signal generator (used to send a white field image signal for debugging to the projector), an illuminance meter (used to measure the color coordinates of the white field image displayed by the projector and send it to the computer), and a dedicated HDMI cable, a standard HDMI cable or a USB cable connection between the devices. The debugging process is: the computer runs the white balance debugging software, sends instructions to run the signal generator through a dedicated HDMI data cable to send a white field / dark field image signal to the projector through a standard HDMI signal cable, the projector displays the white field / dark field image, the illuminance meter measures the color coordinate value of the white field / dark field image and transmits it to the white balance debugging software of the computer through a USB data cable, the white balance debugging software calculates the corresponding white balance parameters according to the inherent algorithm after receiving the color coordinate value and refreshes the projector image channel data register through the dedicated HDMI data cable, and then the illuminance meter measures whether the white field / dark field image of the projector that calls the new white balance parameter meets the white balance color coordinate requirements. Using this debugging method, the debugging system requires a special tooling computer and signal generator, and the equipment cost is relatively high; there are many signal and data cables, and the debugging of each projector requires manual plug-in of two HDMI cables, which consumes man-hours and affects the production rhythm of the assembly line; a more complex system will make maintenance more difficult and more costly, and failures in connecting cables and computer systems will directly affect normal production.

[0004] In summary, the existing white balance adjustment method has the problems of not limiting the optical machine luminous flux, poor debugging consistency, cumbersome and time-consuming debugging process affecting production rhythm and high labor costs, and complex system with difficult and expensive maintenance. Summary of the invention

[0005] The present invention provides a projection system automatic white balance adjustment method, device and storage medium to solve the problems of high cost, poor color consistency, complex process and optical-mechanical luminous flux loss of the current white balance adjustment method.

[0006] The technical solution adopted by the present invention is to provide a method for automatic white balance adjustment of a projection system, comprising the following steps:

[0007] Set the projector to high brightness mode, connect the projector to the illuminance meter, and turn on the illuminance meter;

[0008] Make the projector play red, green, blue and white images in sequence;

[0009] Query and receive the illuminance value and color coordinate data obtained and returned by the illuminance meter for measuring each image;

[0010] After determining that the illumination values ​​of the red, green, and blue pure color images have reached the preset illumination value specifications, the illumination and color coordinate data of the currently received red, green, blue, and white images are compared with the preset white balance combination parameters, and the white balance combination parameters that meet the conditions are written into the data registers corresponding to the image processing of all channels;

[0011] Call the new white balance parameters to replay the white image, and confirm that the luminous flux and white balance meet the preset specification requirements, then the white balance debugging is completed.

[0012] Furthermore, after determining that the illumination values ​​of the red, green, and blue pure color images have reached the preset illumination value specifications, the illumination and color coordinate data of the currently received red, green, blue, and white images are compared with the preset white balance combination parameters, and the method of writing the qualified white balance combination parameters into the data registers corresponding to the image processing of all channels includes:

[0013] Identify the received illumination and color coordinate data. If the illumination of the red field meets the minimum illumination limit of the red field, store the illumination and color coordinate data of the red field and execute the next step of playing the green field image normally. If the illumination of the red field does not meet the minimum illumination limit of the red field, indicate that the light source of the optical machine is faulty and stop running.

[0014] If the green field illumination meets the minimum limit of the green field illumination, the green field illumination and color coordinate data are stored and the next step of playing the blue field image is performed normally; if the green field illumination does not meet the minimum limit of the green field illumination, the light source failure of the optical machine is prompted and the operation is stopped;

[0015] If the blue field illumination meets the minimum limit of the blue field illumination, the blue field illumination and color coordinate data are stored and the next step of playing the white field image is performed normally; if the blue field illumination does not meet the minimum limit of the blue field illumination, the light source failure of the optical machine is prompted and the operation is stopped;

[0016] Query the illuminance meter and store the white field illuminance and color coordinate data returned by the illuminance meter;

[0017] Call the stored illumination and color coordinate data of the red, green, blue and white images of the current projector, read the white balance parameter data group according to the table lookup rules, select the R / G / B gain data group that meets the requirements and import it into the image processing channel.

[0018] Furthermore, after the white balance adjustment is completed, the projector is also restored to factory settings.

[0019] The present invention also provides an automatic white balance adjustment device for a projection system, comprising: a projector, an illuminance meter and an adjustment module, wherein the projector and the illuminance meter are connected by wire or wirelessly, and the illuminance meter is fixedly mounted on the screen of the projector; the adjustment module comprises:

[0020] A playback module, used to enable the projector to play red, green, blue and white images in sequence;

[0021] A receiving module is used to query and receive the illuminance value and color coordinate data obtained and returned by the illuminance meter when measuring each image;

[0022] The logic processing module is used to determine that the illumination values ​​of the red, green, and blue pure color images have reached the preset illumination value specifications, and then compare the illumination and color coordinate data of the currently received red, green, blue, and white images with the preset white balance combination parameters, and write the white balance combination parameters that meet the conditions into the data registers corresponding to the image processing of all channels;

[0023] Confirm the module, call the new white balance parameters to replay the white image, and confirm that the luminous flux and white balance meet the preset specification requirements, then the white balance debugging is completed.

[0024] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, the steps of the above-mentioned projection system automatic white balance debugging method are executed.

[0025] The beneficial effects of the present invention are:

[0026] 1) For projectors, luminous flux is a very important parameter, which directly affects the size of the projected image and the user's viewing experience; inappropriate white balance debugging methods may cause the light generated by the projector light source to be unable to be projected efficiently, resulting in an impact on the projection area and user experience, and the light energy is directly converted into heat energy in the projector optical machine, resulting in abnormal temperature rise, which affects the life and reliability of the optical machine. The present invention measures the image illumination in each red, green, blue, and white pure color field, and can automatically adjust the white balance to meet the pre-set range requirements under the premise of ensuring the luminous flux of the optical machine.

[0027] 2) The present invention integrates the white balance debugging system, debugging images, and white balance data groups into the white balance debugging APP application software, and automatically plays red, green, blue, and white images during white balance debugging, replacing the signal generator required in the prior art to play the debugging image and the image signal transmission line, replacing the computer debugging system and the software and hardware contained therein, reducing the complexity of the debugging system, reducing costs, and avoiding system instability caused by too many debugging devices and connecting lines.

[0028] 3) The entire debugging system of the present invention has a simple composition, fast debugging speed, low cost and good consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a white balance debugging system in the prior art;

[0030] Figure 2 A schematic diagram of a projector white balance debugging system provided by the present invention;

[0031] Figure 3 A flowchart of the automatic white balance debugging method for a projection system provided by the present invention;

[0032] Figure 4 Functional block diagram of the dedicated white balance debugging APP provided by the present invention;

[0033] Figure 5 Each step of white balance debugging is displayed on the APP and returns the illuminance meter parameters and debugging results. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0035] Embodiment 1:

[0036] The technical solution of this embodiment provides a method for automatic white balance debugging of a projection system, which solves the problems existing in the existing white balance debugging technical solution, such as the inability to control the projector's luminous flux to be too low, the white balance debugging system requiring a dedicated signal generator and a computer white balance debugging system, and the complex connection lines, especially the inconvenience of obtaining dedicated connection lines. The debugging system and the debugging pictures are integrated into the self-developed white balance debugging APP application software, the signal generator and the computer white balance debugging system and most signal / data connection lines are eliminated, and the illumination / color coordinates of each red / green / blue / white image are measured for white balance debugging, which effectively controls the projector's luminous flux to be too low, reduces the debugging cost, and ensures the consistency of the luminous flux and the image quality of the projector after white balance debugging.

[0037] Figure 1 and Figure 2 By comparison, it can be seen that the white balance debugging system provided in this embodiment does not require the image signal generator, computer test computer debugging system and image signal transmission line required by the prior art, which reduces the cost of the debugging equipment and avoids the system instability caused by too many connecting lines.

[0038] Figure 2 This is the communication connection method between the projector and the illuminance meter in this embodiment. The APP communicates with the illuminance meter to read the illuminance and color coordinate data obtained by the illuminance meter:

[0039] 1. You can use wired connection and connect directly through the USB interface.

[0040] 2. The projector has a built-in Bluetooth module, which can communicate wirelessly with the illuminance meter connected to the Bluetooth adapter via Bluetooth.

[0041] 3. Infrared transceivers can be connected to the projector and illuminance meter for wireless communication.

[0042] Figure 2 The illuminance meter (such as CL200-A) is installed and fixed on the screen. The distance between the projector and the screen, the color of the screen cloth or wall, and the light reflection characteristics must meet the test requirements.

[0043] Figure 2 The projector based on the Android operating system is pre-installed with a dedicated white balance adjustment APP. Figure 4 This is the functional block diagram of the APP:

[0044] 1. The APP comes with red / green / blue / white test pictures required for white balance debugging. The APP can automatically call the projector system video player to set the image highlight mode to play the above pictures. The pixel specifications of the pictures are the same as the optical machine DMD display resolution specifications, both of which are 100% brightness.

[0045] 2. The APP contains the minimum illumination limits of the red / green / blue / white light sources required to meet the projector's luminous flux specifications.

[0046] 3. The APP contains a white balance data set corresponding to the illumination and color coordinate data of different red / green / blue / white images.

[0047] 4. Figure 5 After running the APP, you can set the target color coordinates x, y and error range of white balance adjustment.

[0048] 5. The APP can communicate with the illuminance meter through the software interface to obtain the illuminance / color coordinates / color temperature values ​​of the projected image.

[0049] 6. The APP has the permission to write the white balance data into the projector image channel register through the software interface and save it.

[0050] In order to achieve the above-mentioned object of the present invention, the technical solution of the white balance adjustment method of the projector is as follows.

[0051] Provided is a projection system automatic white balance debugging method, comprising the following steps, wherein the following steps are execution programs of a self-developed APP application.

[0052] S1. Set the projector to high brightness mode, connect the projector and the illuminance meter, and turn on the illuminance meter.

[0053] Specifically, after turning on the illuminance meter, set it to the Ev, x, y display mode, the projector body is level and facing the screen, the geometric correction is normal, the projector is placed according to the distance requirements from the projector to the screen, and the horizontal and vertical positions of the projector are kept in line with the image center and the metering point of the illuminance meter.

[0054] S2. Make the projector play red, green, blue and white images in sequence.

[0055] S3. Query and receive the illuminance value and color coordinate data obtained and returned by the illuminance meter for each image.

[0056] S4. After determining that the illumination values ​​of the red, green, and blue pure color images have reached the preset illumination value specifications, the illumination and color coordinate data of the currently received red, green, blue, and white images are compared with the preset white balance combination parameters, and the white balance combination parameters that meet the conditions are written into the data registers corresponding to the image processing of all channels.

[0057] Specifically, S4 includes the following steps:

[0058] S41. Identify the received illumination and color coordinate data. If the red field illumination meets the minimum illumination limit requirement of the red field, store the red field illumination and color coordinate data and execute the next step of playing the green field image normally. If the red field illumination does not meet the minimum illumination requirement of the red field, indicate that the optical machine light source fails and stop running.

[0059] S42. If the green field illumination meets the minimum limit requirement of the green field illumination, the green field illumination and color coordinate data are stored and the next step of playing the blue field image is performed normally; if the green field illumination does not meet the minimum requirement of the green field illumination, the light source failure of the optical machine is prompted and the operation is stopped.

[0060] S43. If the blue field illumination meets the minimum limit of the blue field illumination, the blue field illumination and color coordinate data are stored and the next step of playing the white field image is performed normally; if the blue field illumination does not meet the minimum limit of the blue field illumination, the light source failure of the optical machine is prompted and the operation is stopped.

[0061] S44, querying the illuminance meter and storing the white field illuminance and color coordinate data returned by the illuminance meter.

[0062] S45, calling the stored illumination and color coordinate data of the red, green, blue and white images of the current projector, reading the white balance parameter data group according to the table lookup rule, selecting the R / G / B gain data group that meets the requirements and importing it into the image processing channel.

[0063] S5. Call the new white balance parameters to replay the white image, and confirm that the luminous flux and white balance meet the preset specification requirements, and the white balance debugging is completed.

[0064] After debugging, Figure 5 The target color coordinates x, y and error range of the white balance adjustment set according to the adjustment requirements are displayed.

[0065] S6. After the debugging of other debugging items of the projector is completed and before it is ready to be packaged on the production line, restore the projector to factory settings and the white balance debugging APP application software will be automatically uninstalled to avoid occupying the projector system storage resources and forming invisible costs.

[0066] The projector white balance debugging method invented above can ensure that the luminous flux of the projector product is above the limit allowed by the specification during the debugging process, thereby ensuring the image brightness and improving the user experience. The white balance debugging method has high debugging efficiency, good controllability of the debugging results, low debugging system and maintenance costs, and has great practical value in the projection industry, and is suitable for promotion and use.

[0067] Example 2

[0068] This embodiment discloses an automatic white balance adjustment device for a projection system, comprising: a projector, an illuminance meter, and an adjustment module, wherein the projector and the illuminance meter are connected by wire or wirelessly, and the illuminance meter is fixed on the screen of the projector; the adjustment module comprises:

[0069] A playback module, used to enable the projector to play red, green, blue and white images in sequence;

[0070] A receiving module is used to query and receive the illuminance value and color coordinate data obtained and returned by the illuminance meter when measuring each image;

[0071] The logic processing module is used to determine that the illumination values ​​of the red, green, and blue pure color images have reached the preset illumination value specifications, and then compare the illumination and color coordinate data of the currently received red, green, blue, and white images with the preset white balance combination parameters, and write the white balance combination parameters that meet the conditions into the data registers corresponding to the image processing of all channels;

[0072] Confirm the module, call the new white balance parameters to replay the white image, and confirm that the luminous flux and white balance meet the preset specification requirements, then the white balance debugging is completed.

[0073] Example 3

[0074] This embodiment discloses a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for automatic white balance adjustment of a projection system as described in Embodiment 1 are executed.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A projection system automatic white balance debugging method, characterized in that: The steps include: The debugging system and debugging images were integrated into the self-developed white balance debugging APP application software; The white balance debugging APP is pre-installed on the projector based on the Android operating system; The projector and illuminometer form an automatic white balance adjustment device; After starting the automatic white balance adjustment, the APP performs the following steps: Set the projector to high brightness mode, connect the projector to the illuminance meter, and turn on the illuminance meter; Make the projector play red, green, blue and white images in sequence; Query and receive the illuminance value and color coordinate data obtained and returned by the illuminance meter for measuring each image; After determining that the illumination values ​​of the red, green, and blue pure color images have reached the preset illumination value specifications, the illumination and color coordinate data of the currently received red, green, blue, and white images are compared with the preset white balance combination parameters, and the white balance combination parameters that meet the conditions are written into the data registers corresponding to the image processing of all channels; Call the new white balance parameters to replay the white image, and confirm that the luminous flux and white balance meet the preset specification requirements, then the white balance debugging is completed.

2. The projection system automatic white balance debugging method according to claim 1, characterized in that: After determining that the illumination values ​​of the red, green, and blue pure color images have reached the preset illumination value specifications, the illumination and color coordinate data of the currently received red, green, blue, and white images are compared with the preset white balance combination parameters, and the method of writing the qualified white balance combination parameters into the data registers corresponding to the image processing of all channels includes: Identify the received illumination and color coordinate data. If the illumination of the red field meets the minimum illumination limit of the red field, store the illumination and color coordinate data of the red field and execute the next step of playing the green field image normally. If the illumination of the red field does not meet the minimum illumination limit of the red field, indicate that the light source of the optical machine is faulty and stop running. If the green field illumination meets the minimum limit of the green field illumination, the green field illumination and color coordinate data are stored and the next step of playing the blue field image is performed normally; if the green field illumination does not meet the minimum limit of the green field illumination, the light source failure of the optical machine is prompted and the operation is stopped; If the blue field illumination meets the minimum limit of the blue field illumination, the blue field illumination and color coordinate data are stored and the next step of playing the white field image is performed normally; if the blue field illumination does not meet the minimum limit of the blue field illumination, the light source failure of the optical machine is prompted and the operation is stopped; Query the illuminance meter and store the white field illuminance and color coordinate data returned by the illuminance meter; Call the stored illumination and color coordinate data of the red, green, blue and white images of the current projector, read the white balance parameter data group according to the table lookup rules, select the R / G / B gain data group that meets the requirements and import it into the image processing channel.

3. The projection system automatic white balance adjustment method according to claim 1 or 2, characterized in that: After all production debugging including the white balance debugging is completed, the projector is also restored to factory settings.

4. A projection system automatic white balance debugging device, characterized in that: It includes: a projector and an illuminometer, wherein the projector and the illuminometer are connected by wire or wirelessly, and the illuminometer is installed and fixed on the screen of the projector; The projector is installed with an automatic white balance debugging program APP, and the white balance debugging APP includes the following functional modules: Communication interface module, used for the white balance debugging APP to read the color coordinates and illuminance value data of the red, green, blue and white pictures projected by the projector measured by the illuminance meter through the connection device; The data processing module is used to debug the APP to determine whether the illumination of each color LED meets the minimum illumination limit requirement; The logic processing module is used to debug the APP call and control the projector's built-in playback module to play red, green, blue and white pictures, and control the debugging process and the display of debugging results; It is used to determine that the illumination values ​​of the red, green and blue pure color images have reached the preset illumination value specifications, and then compare the illumination and color coordinate data of the currently received red, green, blue and white images with the preset white balance combination parameters, and write the qualified white balance combination parameters into the data registers corresponding to the image processing of all channels; The UI interface is used for the white balance debugging APP to display the adjusted color coordinate error limit, debugging process and debugging results.

5. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for automatic white balance adjustment of a projection system according to any one of claims 1 to 3 are executed.

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