CN110708526A - Illuminance measuring method, measuring device, computer equipment and storage medium - Google Patents

Abstract

The invention discloses an illumination measurement method, a measurement device, a computer device and a storage medium. The method includes: controlling a projection module to be tested to respectively project channel images of different color channels of a test image to a projection screen; controlling an image acquisition device to respectively collect the projection images of the different color channels from the projection screen; The color information value corresponding to each color channel; according to the color illuminance conversion formula corresponding to each color channel and the color information value, respectively calculate the color illuminance value corresponding to each color channel; The illuminance value of the projection module. The embodiments provided by the present invention can solve the problems of high device cost and high labor cost in the prior art by using an illuminometer to measure the illuminance value by using an image acquisition device to quickly and accurately measure the illuminance value of the projected image of the projection module to be tested. It has practical application significance.

Description

A kind of illuminance measurement method, measurement device, computer equipment and storage medium

technical field

The present invention relates to the field of display technology, and in particular, to an illumination measurement method, a measurement device, a computer storage medium and computer equipment.

Background technique

After the projection module is assembled, it is necessary to test the projected image, and determine whether it meets the factory specifications by measuring the illuminance value of the projected image projected by the projection module onto the projection screen. The solution of the general module manufacturer is to use the illuminance meter to obtain the illuminance value of the projected image. However, since the illuminance value of multiple areas of the projected image needs to be obtained, the illuminance meter needs to be moved to the center point of each area in turn, or multiple illuminance values need to be taken. It takes a long time to obtain the illuminance value by the meter, or the investment cost of the measuring device is high, and it also requires high labor cost.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an illuminance measurement method, a measurement device, a computer storage medium and a computer device to solve at least one of the problems existing in the prior art.

A first aspect of the present invention provides an illumination measurement method, comprising:

Control the projection module to be tested to project the channel images of different color channels of the test image to the projection screen respectively;

Controlling the image acquisition device to separately acquire the projection images of the different color channels from the projection screen;

Calculate the color information value corresponding to each color channel according to the projection image;

Calculate the color illuminance value corresponding to each color channel according to the color illuminance conversion formula corresponding to each color channel and the color information value;

Calculate the illuminance value of the projection module to be tested according to the color illuminance value corresponding to each color channel.

Optionally, before the projection module to be tested is controlled to project the channel images of different color channels of the test image to the projection screen, the illumination measurement method further includes:

A color illuminance conversion formula corresponding to each color channel of the image acquisition device is obtained according to the illuminance of at least one group of sample images with different color ratios projected by the sample projection module onto the projection screen.

Optionally, obtaining the color illuminance conversion formula corresponding to each color channel of the image acquisition device according to the illuminance of at least one group of sample images with different color ratios projected by the sample projection module onto the projection screen further includes:

Controlling the sample projection module to project channel images of different color channels of at least one group of sample images with different color ratios to the projection screen;

controlling the image acquisition device to separately acquire projection images of different color channels from the projection screen;

Calculate the color information value corresponding to each color channel according to the projection image;

Use an illuminometer to detect the illuminance values on the projection screen under different color channels respectively;

A color-illuminance conversion formula corresponding to each color channel of the image acquisition device is obtained according to the color information value and the illuminance value corresponding to each color channel.

Optionally, obtaining the color-illuminance conversion formula corresponding to each color channel of the image acquisition device according to the color information value and the illuminance value corresponding to each color channel further includes:

According to the color information value and the illuminance value corresponding to each color channel, the color illuminance conversion formula corresponding to each color channel of the image acquisition device is obtained by the least square method.

Optionally, using an illuminance meter to detect the illuminance values on the projection screen under different color channels further includes:

The illuminance meter is set at the center position of the projected image on the projection screen, so as to use the illuminance meter to detect the illuminance value of the center position of the projected image under different color channels respectively.

Optionally, using an illuminance meter to detect the illuminance values on the projection screen under different color channels further includes:

A plurality of illuminometers are respectively set at the center positions of the plurality of preset areas of the projected image on the projection screen, so as to use the plurality of illuminometers to detect the difference between the center positions of the respective preset areas of the projected images under different color channels. Illuminance value.

Optionally, the different color channels include a red channel, a green channel and a blue channel.

A second aspect of the present invention provides an illumination measurement device, including an image acquisition device and a processor;

The image acquisition device is configured to collect projection images of different color channels projected by the projection module to be tested from the projection screen respectively;

The processor is configured to calculate the color information value corresponding to each color channel according to the projection image, and calculate the color illuminance value corresponding to each color channel according to the color illuminance conversion formula corresponding to each color channel and the color information value respectively , and calculate the illuminance value of the projection module to be tested according to the color illuminance value corresponding to each color channel.

A third aspect of the present invention provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the method described in the first aspect.

A fourth aspect of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the method according to the first aspect when the processor executes the program .

The beneficial effects of the present invention are as follows:

Aiming at the existing problems at present, the present invention formulates an illuminance measurement method, a measuring device, a computer equipment and a storage medium based on an image acquisition device, by using the image acquisition device to quickly and accurately measure the illuminance value of the projected image of the projection module to be tested , which can solve the problems of high device cost and high labor cost of using an illuminance meter to measure the illuminance value in the prior art, and has practical application significance.

Description of drawings

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

1 shows a flowchart of an illumination measurement method provided by an embodiment of the present invention;

Fig. 2 shows the scene schematic diagram of measuring the illuminance of the projection module to be tested;

3 shows a structural block diagram of an illuminance measuring device provided by another embodiment of the present invention;

FIG. 4 shows a schematic structural diagram of a computer device provided by another embodiment of the present invention.

Detailed ways

In order to illustrate the present invention more clearly, the present invention will be further described below with reference to the preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

As shown in FIG. 1, an embodiment of the present invention provides an illumination measurement method based on an image acquisition device, including: controlling the projection module to be tested to respectively project channel images of different color channels of the test image to the projection screen; controlling The image acquisition device separately collects the projection images of the different color channels from the projection screen; calculates the color information value corresponding to each color channel according to the projection image; according to the color illuminance conversion formula corresponding to each color channel and the color information value Calculate the color illuminance value corresponding to each color channel respectively; calculate the illuminance value of the projection module to be tested according to the color illuminance value corresponding to each color channel.

In a specific example, as shown in Figure 2, the illumination measurement method includes:

The first step is to control the projection module 10 to be tested to project the test image onto the projection screen 20 according to different color channels.

In this embodiment, the different color channels include a red channel, a green channel, and a blue channel. For example, the projection module to be tested is controlled to project the red channel image, the green channel image, and the blue channel image of the test image to the projector respectively. On the screen 20, the projection module to be tested is controlled to project the channel images of the three color channels of the test image respectively.

The second step is to control the image acquisition device 30 to acquire projection images 40 of different color channels from the projection screen 20 respectively.

In this embodiment, the image acquisition device 30 is an industrial camera, or other image acquisition devices. The camera of the industrial camera is used to capture the test image projected on the projection screen to obtain the projected image, that is, to control the image acquisition device to capture the test images respectively. A projected image of three colors for the red, green, and blue channels.

The third step is to calculate the color information value corresponding to each color channel according to the projected image.

In this embodiment, the data processing device processes the projection images of the images of each color channel collected by the image acquisition device. For example, for the projection images of the red channel, the projection images are divided into at least one area, that is, the projection images can be regarded as a The projected image can also be divided into multiple regions, and the color information value of the center position of each region can be calculated.

Step 4: Calculate the color illuminance value corresponding to each color channel according to the color illuminance conversion formula corresponding to each color channel and the color information value.

In this embodiment, the color illuminance conversion formula is a color illuminance conversion formula obtained in advance according to the characteristics of the image acquisition device, that is, the industrial camera.

In some optional implementations of this embodiment, before the controlling the projection module to be tested projects the channel images of different color channels of the test image to the projection screen, the illumination measurement method further includes: projecting according to the sample The illuminance of at least one group of sample images with different color ratios projected by the module onto the projection screen obtains the color illuminance conversion formula corresponding to each color channel of the image acquisition device.

Specifically include:

First, control the sample projection module to project channel images of different color channels of at least one group of sample images with different color ratios to the projection screen.

In this embodiment, a sample projection module is used as a test sample to project a sample image, wherein the sample image may be one image or multiple images. In this embodiment, twenty sets of sample images are used, and the sample projection module is used to project a sample image. Project each group of sample images on the projection screen according to the red channel, green channel and blue channel respectively. The greater the number of the sample images, the more accurate the color-illuminance conversion formula.

Second, control the image acquisition device to collect projection images of different color channels from the projection screen respectively.

In this embodiment, corresponding to the channel image of each color channel of each sample image projected by the sample projection module, the industrial camera is controlled to shoot the projection screen respectively to obtain the projected image of each color channel.

Third, calculate the color information value corresponding to each color channel according to the projected image.

In this embodiment, the data processing device processes the projected image of each color channel captured by the industrial camera, and obtains the color information value of the center position of each area of the projected image.

Fourth, use an illuminometer to detect the illuminance values on the projection screen under different color channels respectively.

In this embodiment, corresponding to the channel image of each color channel of each sample image projected by the sample projection module, an illuminometer is installed on the projection screen to detect the illuminance value of the projected image respectively.

In some optional implementations of this embodiment, the illuminance meter is set at the center position of the projected image on the projection screen, so as to use the illuminance meter to detect the illuminance of the center position of the projected image under different color channels respectively value. That is to say, use an illuminance meter, set the illuminance meter at the center position of the projected image on the projection screen, and detect the illuminance value of this position.

In another optional implementation manner, multiple illuminance meters are respectively set at the center positions of multiple preset areas of the projected image on the projection screen, so as to use the multiple illuminance meters to detect the down-projection of different color channels respectively The illuminance value of the center position of each preset area of the image. That is, using multiple illuminometers, the center positions of the regions divided according to the projected images are set at the corresponding positions of the projection screen, so as to realize the detection of the illuminance values of the center positions of the multiple regions. Using multiple illuminance values for detection can effectively improve the accuracy of the detected illuminance values.

Fifth, obtain the color-illuminance conversion formula corresponding to each color channel of the image acquisition device according to the color information value and the illuminance value corresponding to each color channel.

In this embodiment, 20 groups of sample images are used to project channel images in each color channel: the industrial camera has captured 20 groups of 60 projection images with three color channels in each group, and the data processing device based on the 60 projection images The image obtains the color information value of the center position of each area on each projection image, for example, the color information value of the center position of the nine areas of the red channel of the first sample image, and the illuminance meter of the red channel of the sample image at nine. The illuminance value detected at the center position of each area is compared, and the conversion formula of the color information value and the illuminance value in the red channel is calculated.

Further, according to the color information value and the illuminance value corresponding to each color channel, the color illuminance conversion formula corresponding to each color channel of the image acquisition device is obtained by the least square method.

E.g,

The illuminance value of the red channel is:

EV_R=K_R*R+B_R;

Among them, EV_R is the illuminance value of the red channel, R is the color information value of the red channel, K_R is the proportional coefficient of the red color information value and the illuminance value, and B_R is the deviation value of the red color information value and the illuminance value.

The illuminance values for the green channel are:

EV_G=K_G*R+B_G;

Among them, EV_G is the illuminance value of the green channel, G is the color information value of the green channel, K_G is the proportional coefficient of the green color information value and the illuminance value, and B_G is the deviation value of the green color information value and the illuminance value.

The luminance value of the blue channel is:

EV_B=K_B*R+B_B

Among them, EV_B is the illuminance value of the blue channel, B is the color information value of the blue channel, K_B is the proportional coefficient of the blue color information value and the illuminance value, and B_B is the deviation value of the blue color information value and the illuminance value.

After obtaining the color illuminance conversion formula corresponding to each color channel, the color information value of each color channel obtained by projecting the test image of the projection module to be tested is substituted into the color illuminance conversion formula of the corresponding color to calculate the color corresponding to different color channels The luminance value, wherein the color information value of each color channel is the average value of the color information values of the center positions of each area in a certain color channel.

Finally, the illuminance value of the projection module to be tested is calculated according to the color illuminance value corresponding to each color channel.

In this embodiment, the illuminance value of the projection module to be tested can be obtained by summing the illuminance values of the red channel, the green channel and the blue channel.

For example, Ev_White=EV_R+EV_G+EV_B;

Among them, EV_R is the illumination value of the red channel of the projection module to be tested, that is, the illumination value of the red color field; EV_G is the illumination value of the green channel of the projection module to be tested, that is, the illumination value of the green color field; EV_B is the projection mode to be tested. The illuminance value of the group blue channel, that is, the illuminance value of the blue color field; Ev_White is the white field illuminance value of the projection module to be tested, that is, the illuminance including the illuminance value of the red color field, the illuminance value of the green color field, and the illuminance value of the blue color field. value.

It should be noted that the different color channels described in this embodiment are the red channel, the green channel and the blue channel are only used to illustrate the specific implementation manner, and the projection screen may be a projection screen or a projection screen or other device that presents projection effects, The image acquisition device and the module to be tested can be located on both sides of the projection screen or on one side of the projection screen. The greater the number of divisions of the area, the more accurate the illuminance value of the projection module to be tested finally obtained. Personnel should choose according to the actual application requirements to meet the actual application as the design criteria, and will not repeat them here.

As shown in FIG. 3 , another embodiment of the present invention provides an illuminance measurement device, including an image acquisition device and a processor (data processing device), wherein the image acquisition device is configured to acquire objects to be collected from a projection screen respectively. measuring the projected images of different color channels projected by the projection module; the processor is configured to calculate the color information value corresponding to each color channel according to the projected image, and to calculate the color information value corresponding to each color channel according to the color illuminance conversion formula corresponding to each color channel and the The color information value respectively calculates the color illuminance value corresponding to each color channel, and calculates the illuminance value of the projection module to be tested according to the color illuminance value corresponding to each color channel.

In this embodiment, the image acquisition device and the processor can quickly and accurately measure the illuminance value of the projected image of the projection module to be tested, which can solve the problem of the high cost and labor cost of the device used to measure the illuminance value using an illuminometer in the prior art. The problem of high cost has practical application significance.

Since the illuminance measuring device provided in this embodiment corresponds to the illuminance measuring method provided in the above-mentioned embodiments, the previous embodiments are also applicable to the illuminance measuring device provided in this embodiment, and are not described in detail in this embodiment.

Another embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, realizes: controlling the projection module to be tested to respectively convert the channel images of different color channels of the test image Projecting onto a projection screen; controlling the image acquisition device to collect projection images of the different color channels from the projection screen respectively; calculating the color information value corresponding to each color channel according to the projection image; according to the color illuminance conversion formula corresponding to each color channel Calculate the color illuminance value corresponding to each color channel separately from the color information value; calculate the illuminance value of the projection module to be tested according to the color illuminance value corresponding to each color channel.

In practical applications, the computer-readable storage medium may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or a combination of any of the above. More specific examples (a non-exhaustive list) of computer readable storage media include: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read only memory (ROM), Erasable programmable read only memory (EPROM or flash memory), optical fiber, portable compact disk read only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

A computer-readable signal medium may include a propagated data signal in baseband or as part of a carrier wave, with computer-readable program code embodied thereon. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device .

Program code embodied on a computer readable medium may be transmitted using any suitable medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations of the present invention may be written in one or more programming languages, including object-oriented programming languages—such as Java, Smalltalk, C++, but also conventional Procedural programming language - such as the "C" language or similar programming language. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (eg, using an Internet service provider through Internet connection).

As shown in FIG. 4, another embodiment of the present invention provides a schematic structural diagram of a computer device. The computer device 12 shown in FIG. 4 is only an example, and should not impose any limitation on the function and scope of use of the embodiments of the present invention.

As shown in FIG. 4, computer device 12 takes the form of a general-purpose computing device. Components of computer device 12 may include, but are not limited to, one or more processors or processing units 16 , system memory 28 , and a bus 18 connecting various system components including system memory 28 and processing unit 16 .

Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of a variety of bus structures. By way of example, these architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect ( PCI) bus.

Computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by computer device 12, including both volatile and nonvolatile media, removable and non-removable media.

System memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and/or cache memory 32 . Computer device 12 may further include other removable/non-removable, volatile/non-volatile computer system storage media. For example only, storage system 34 may be used to read and write to non-removable, non-volatile magnetic media (not shown in FIG. 4, commonly referred to as a "hard drive"). Although not shown in Figure 4, a disk drive may be provided for reading and writing to removable non-volatile magnetic disks (eg "floppy disks"), and removable non-volatile optical disks (eg CD-ROM, DVD-ROM) or other optical media) to read and write optical drives. In these cases, each drive may be connected to bus 18 through one or more data media interfaces. Memory 28 may include at least one program product having a set (eg, at least one) of program modules configured to perform the functions of various embodiments of the present invention.

A program/utility 40 having a set (at least one) of program modules 42, which may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data , each or some combination of these examples may include an implementation of a network environment. Program modules 42 generally perform the functions and/or methods of the described embodiments of the present invention.

Computer device 12 may also communicate with one or more external devices 14 (eg, keyboard, pointing device, display 24, etc.), may also communicate with one or more devices that enable a user to interact with computer device 12, and/or communicate with Any device (eg, network card, modem, etc.) that enables the computer device 12 to communicate with one or more other computing devices. Such communication may take place through input/output (I/O) interface 22 . Also, the computer device 12 may communicate with one or more networks (eg, a local area network (LAN), a wide area network (WAN), and/or a public network such as the Internet) through a network adapter 20 . As shown in FIG. 4 , network adapter 20 communicates with other modules of computer device 12 via bus 18 . It should be appreciated that, although not shown in FIG. 4, other hardware and/or software modules may be used in conjunction with computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tapes drives and data backup storage systems.

The processor unit 16 executes various functional applications and data processing by running the programs stored in the system memory 28 , for example, implementing an illumination measurement method based on an image acquisition device provided by the embodiment of the present invention.

Aiming at the existing problems at present, the present invention formulates an illuminance measurement method, a measuring device, a computer equipment and a storage medium based on an image acquisition device, by using the image acquisition device to quickly and accurately measure the illuminance value of the projected image of the projection module to be tested , which can solve the problems of high device cost and high labor cost of using an illuminance meter to measure the illuminance value in the prior art, and has practical application significance.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Changes or changes in other different forms cannot be exhausted here, and all obvious changes or changes derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims (10)

1. a method for measuring illuminance, comprising: Control the projection module to be tested to project the channel images of different color channels of the test image to the projection screen respectively; Controlling the image acquisition device to separately acquire the projection images of the different color channels from the projection screen; Calculate the color information value corresponding to each color channel according to the projection image; Calculate the color illuminance value corresponding to each color channel according to the color illuminance conversion formula corresponding to each color channel and the color information value; Calculate the illuminance value of the projection module to be tested according to the color illuminance value corresponding to each color channel. 2. The illuminance measurement method according to claim 1, wherein before the control projection module to be tested projects the channel images of the different color channels of the test image to the projection screen respectively, the illuminance measurement method further comprises: : A color illuminance conversion formula corresponding to each color channel of the image acquisition device is obtained according to the illuminance of at least one group of sample images with different color ratios projected by the sample projection module onto the projection screen. 3 . The illuminance measurement method according to claim 2 , wherein the illuminance of at least one group of sample images with different color ratios projected by the sample projection module to the projection screen is obtained by the image acquisition device. 4 . The color illuminance conversion formula corresponding to the color channel further includes: Controlling the sample projection module to project channel images of different color channels of at least one group of sample images with different color ratios to the projection screen; controlling the image acquisition device to separately acquire projection images of different color channels from the projection screen; Calculate the color information value corresponding to each color channel according to the projection image; Use an illuminometer to detect the illuminance values on the projection screen under different color channels respectively; A color-illuminance conversion formula corresponding to each color channel of the image acquisition device is obtained according to the color information value and the illuminance value corresponding to each color channel. 4. The method for measuring illuminance according to claim 3, wherein the obtaining the color illuminance conversion formula corresponding to each color channel of the image acquisition device according to the color information value and the illuminance value corresponding to each color channel further comprises: According to the color information value and the illuminance value corresponding to each color channel, the color illuminance conversion formula corresponding to each color channel of the image acquisition device is obtained by the least square method. 5. The illuminance measurement method according to claim 4, wherein the step of detecting the illuminance values on the projection screen under different color channels using an illuminance meter further comprises: The illuminance meter is set at the center position of the projected image on the projection screen, so as to use the illuminance meter to detect the illuminance value of the center position of the projected image under different color channels respectively. 6. The method for measuring illuminance according to claim 4, wherein the step of detecting the illuminance values on the projection screen under different color channels using an illuminance meter further comprises: A plurality of illuminometers are respectively set at the center positions of the plurality of preset areas of the projected image on the projection screen, so as to use the plurality of illuminometers to detect the difference between the center positions of the respective preset areas of the projected images under different color channels. Illuminance value. 7. The illuminance measurement method according to claim 5 or 6, wherein the different color channels include a red channel, a green channel and a blue channel. 8. An illuminance measuring device, characterized in that it comprises an image acquisition device and a processor; The image acquisition device is configured to collect projection images of different color channels projected by the projection module to be tested from the projection screen respectively; The processor is configured to calculate the color information value corresponding to each color channel according to the projection image, and calculate the color illuminance value corresponding to each color channel according to the color illuminance conversion formula corresponding to each color channel and the color information value respectively , and calculate the illuminance value of the projection module to be tested according to the color illuminance value corresponding to each color channel. 9. A computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, the method according to any one of claims 1-7 is implemented. 10. A computer device, comprising a memory, a processor and a computer program stored in the memory and running on the processor, wherein the processor implements any of claims 1-7 when the processor executes the program. a described method.

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