TWI524308B - Method and device for detecting grayscale image - Google Patents

Description

Gray scale picture detection method and detection device

The invention relates to a grayscale screen detection method and a detection device, in particular to a grayscale screen detection method and a detection device capable of determining the display quality of a screen by itself.

In the production process of electronic devices, it is necessary to detect the image display quality of the electronic device. At present, most enterprises use artificial methods to detect the image display quality of the electronic device when producing the electronic device, usually the projection of the electronic device. The picture is adjusted to a specific picture, and it is judged by the naked eye whether the level division of the gray level of the picture is clear, and whether the picture is good or not is judged by the degree of clarity.

However, the method of artificial judgment has the problem of strong subjectivity and no consistent standard, and it is also prone to misjudgment, and the visual inspection time is too long, resulting in a decrease in production efficiency.

Therefore, an object of the present invention is to provide a grayscale screen detection method and a detection apparatus for an electronic device, which solve the technical problem that the prior manual detection method is subjective and the visual inspection time is too long.

The present invention provides a grayscale screen detection method for an electronic device, comprising the steps of: inputting a standard detection screen to the electronic device, wherein the standard detection screen has a standard grayscale order; and detecting the signal of the screen according to the standard, the electronic device Produce ash on its imaging screen a grayscale image, wherein the grayscale image is divided into a plurality of grayscale ranges according to a grayscale brightness; the grayscale image on the imaging screen is separately collected under a plurality of shooting conditions, wherein the plurality of shooting conditions are respectively set according to the Whether the grayscale image collected by the plurality of grayscale ranges is the clearest; synthesizing the plurality of grayscale images collected; and comparing the first grayscale order of the synthesized grayscale image with the standard grayscale order And judging whether the screen display quality of the electronic device is qualified according to the comparison result.

As a further optional technical solution, the step of generating a signal of the standard detection screen is further included before the input step of the standard detection screen.

As a further optional technical solution, the grayscale picture displayed on the imaging screen has a plurality of grayscale ranges, and the acquiring of the grayscale image comprises acquiring a picture of each grayscale range to obtain a plurality of grayscale images, and synthesizing the A plurality of grayscale pictures obtain a synthetic grayscale picture.

As a further optional technical solution, the plurality of gray scale pictures respectively have different exposure times.

As a further optional technical solution, the acquisition of the gray level order is further included between the obtaining step of the gray scale picture and the comparison step of the gray level order.

As a further optional technical solution, the grayscale order of the grayscale picture is the number of the plurality of regions divided on the grayscale picture, wherein the difference of the grayscale values of the adjacent regions in the plurality of regions Is the predetermined step value.

The present invention also provides a grayscale picture detecting device, the device comprising: a video signal generating device for generating a signal of a standard detection picture, wherein the standard detection picture has a standard gray level order; and the electronic device is electrically coupled to the video signal a signal generating device, the electronic device is configured to receive the signal of the standard detection screen and generate a grayscale image according to the signal; and an imaging screen for imaging the grayscale image on the imaging screen, wherein the grayscale image is grayed out according to the grayscale Degree of darkness Dividing into a plurality of grayscale ranges; the image acquisition device is configured to separately collect grayscale images on the imaging screen under a plurality of shooting conditions, wherein the plurality of shooting conditions are set according to the plurality of grayscale ranges respectively Whether the grayscale picture is the clearest; and the processing unit is electrically coupled to the image acquiring device, the processing unit synthesizes the collected grayscale images, and the first grayscale step of the synthesized grayscale image The number is compared with the standard gray scale order of the standard detection screen, and it is judged whether the screen display quality of the electronic device is qualified according to the comparison result.

As a further optional technical solution, the grayscale picture displayed on the imaging screen has a plurality of grayscale ranges, and the acquiring of the grayscale image comprises acquiring a picture of each grayscale range to obtain a plurality of grayscale images, and synthesizing the A plurality of grayscale pictures obtain a synthetic grayscale picture.

As a further optional technical solution, the plurality of gray scale pictures respectively have different exposure times.

As a further optional technical solution, the grayscale order of the grayscale picture is the number of the plurality of regions divided on the grayscale picture, wherein the difference of the grayscale values of the adjacent regions in the plurality of regions Is the predetermined step value.

Compared with the prior art, the present invention performs the grayscale order acquisition and comparison on the grayscale image generated by the electronic device by the processing unit, thereby improving the detection accuracy and improving the detection efficiency.

100‧‧‧ Gray scale detection device

10‧‧‧Video signal generating device

20‧‧‧Electronic devices

30‧‧‧ imaging screen

40‧‧‧Image acquisition device

50‧‧‧Processing unit

P1, P2‧‧‧ grayscale screen

P‧‧‧Synthetic grayscale screen

Upper part of A‧‧‧

B‧‧‧ lower half

A1, A2, A3, A4, A5, D1, D2‧‧‧ areas

FIG. 1 is a schematic diagram of a gray scale picture detecting apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a dark gray scale picture according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a bright grayscale screen according to an embodiment of the present invention.

4 is a schematic diagram of a synthetic grayscale picture in accordance with an embodiment of the present invention.

FIG. 5 is a schematic diagram of a standard grayscale picture according to an embodiment of the present invention.

In order to further understand the objects, structures, features, and functions of the present invention, the embodiments are described in detail below.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a grayscale picture detecting apparatus according to an embodiment of the present invention. In this embodiment, the grayscale detecting device 100 includes a video signal generating device 10, an electronic device 20, an imaging screen 30, an image acquiring device 40, and a processing unit 50. The video signal generating device 10 is configured to generate a signal of a standard detection picture, wherein the standard detection picture has a standard gray scale order. The electronic device 20 may be a projection device or a display device. The imaging screen 30 may be a display screen of a screen or a display device. In the embodiment, the electronic device 20 takes a projection device as an example, and the imaging screen 30 corresponds to a curtain. To explain. However, the electronic device 20 may be other electronic devices having a screen display function. The electronic device 20 is electrically coupled to the video signal generating device 10, and the electronic device 20 is configured to receive the signal for generating the standard detection picture and generate a grayscale image according to the signal, and the imaging screen 30 is used to image the grayscale image to the imaging device. On the screen 30, the grayscale picture is divided into a plurality of grayscale ranges according to the degree of grayscale brightness. The image acquiring device 40 is configured to separately collect grayscale images on the imaging screen 30 under a plurality of shooting conditions, wherein the plurality of shooting conditions are set according to whether the grayscale images collected according to the plurality of grayscale ranges respectively are the most Clearly, the image acquisition device 40 may be, for example, a camera, but is not limited thereto. The processing unit 50 is electrically coupled to the image acquiring device 40, and the processing unit 50 synthesizes the collected grayscale images, and calculates the first grayscale order N1 of the grayscale image according to the grayscale image, and the first grayscale The order number N1 is compared with the standard gray scale order N of the standard detection picture, and the electronic device is judged according to the comparison result The screen of 20 shows whether the quality is acceptable.

The present invention also provides a method for performing grayscale image detection by using the grayscale image detecting device, and the method specifically includes the following steps:

S1, a signal that produces a standard detection picture.

The video signal generating device 10 generates a signal of its corresponding standard detection picture according to the type of the electronic device 20 to be detected or the performance parameter or the like.

S2, the input of the standard detection screen.

The video signal generating device 10 inputs the generated signal of the standard detection screen to the electronic device 20, for example, the signal of the standard detection screen is input to a value projection device, a display device or the like, wherein the standard detection screen has a standard gray scale order.

S3, the generation of grayscale pictures.

The electronic device 20 generates a grayscale image according to the received signal of the standard detection screen, and displays it on the imaging screen 30. For example, the grayscale image can be displayed on the display screen of the screen or the display device, wherein the grayscale image is grayed out according to the grayscale The degree of darkness is divided into multiple grayscale ranges.

S4, the acquisition of the grayscale picture.

The grayscale image on the imaging screen 30 is separately acquired by the image acquiring device 40 under a plurality of shooting conditions, wherein the setting of the plurality of shooting conditions is based on whether the grayscale image collected by the plurality of grayscale ranges is the clearest. The image acquisition device 40 used in general is, for example, a camera, and its configuration is generally low, and the grayscale image usually has a plurality of grayscale ranges. It is difficult for a normal camera to capture a clear grayscale range on a grayscale image at a time. The display is displayed, so that only one acquisition at a time when collecting the grayscale image will cause distortion of the grayscale image to be tested, thereby causing detection errors; and using the image acquisition device 40 with higher configuration will bring about an increase in production cost. . In the invention In an embodiment, in order to balance the production cost and the accuracy of the detection, the present invention overcomes the technical problem by separately acquiring a grayscale image on the imaging screen under a plurality of shooting conditions. Specifically, the image acquiring device 40 may The screen is captured for different grayscale ranges on the grayscale image, and the grayscale image is determined to be the clearest when capturing grayscale images of any grayscale range; the images of each grayscale range are collected to obtain a plurality of grayscales. The order picture, and a plurality of gray-scale pictures are synthesized to obtain a synthetic gray-scale picture, and the gray-scale picture is synthesized by the gray-scale picture to improve the detection accuracy.

As shown in FIG. 2 to FIG. 4, FIG. 2 is a schematic diagram of a dark grayscale screen according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a grayscale grayscale screen according to an embodiment of the present invention; A schematic diagram of a synthetic grayscale picture. In this embodiment, the gray scale picture is divided into two gray scale ranges of dark order and bright level, and the dark level picture is collected, and the gray scale picture P1 shown in FIG. 2 is obtained, in order to obtain the dark level image. The screen display is relatively clear. Generally, the exposure time of the image acquisition device 40 is required to be long, and then the image is acquired for the brighter image, and the grayscale image P2 shown in FIG. 3 can be obtained. The clearness of the screen display requires that the exposure time of the image acquisition device 40 is short, and then the grayscale image P1 and the grayscale image P2 described above are combined into a composite grayscale image P as shown in FIG.

In this embodiment, only the grayscale image on the imaging screen 30 is divided into two grayscale ranges of bright and dark, and the grayscale image P1 and the grayscale image P2 are separately collected for synthesis. In other embodiments, Dividing the grayscale image on the imaging screen 30 into three or more grayscale ranges to obtain three or more grayscale images, and then synthesizing to obtain a synthetic grayscale image, and the actual operation time visual image acquiring device 40 The size of the clearer grayscale range that can be obtained in a single shot and the size of the grayscale range of the grayscale image on the imaging screen 30 are determined.

In a specific embodiment, setting the exposure time of the image acquisition device 40 may A clear grayscale image of a grayscale range is obtained, so that multiple grayscale images have different exposure times.

In a specific embodiment, the method for synthesizing a plurality of grayscale pictures is to obtain a grayscale picture by superimposing a plurality of grayscale pictures into a grayscale picture according to the picture synthesis software, such as grayscale picture P1 and grayscale picture P2. The overlap is a synthetic grayscale picture P. In other embodiments, the method for synthesizing grayscale pictures is not limited thereto, and those skilled in the art may select a method of synthesis according to actual needs.

S5, the acquisition of the gray level order of the gray scale picture.

Because the grayscale picture projected by the projector is relatively large, usually the grayscale picture P1 contains two parts, as shown in Fig. 2, which are the upper part A and the lower part B respectively, and the upper part A is in the direction of the arrow in the figure. Gradually increasing, while the lower half B gradually decreases in brightness in the direction of the arrow in the figure. In this way, only the part A picture can be avoided, that is, the whole gray scale picture can only display the left dark right feature, and the left bright right feature cannot be completely presented and detected, and the whole gray scale picture is used with A, When the two parts of B are used for image presentation and detection, the test results can be better achieved, and the quality of the product can be improved. The upper half A and the lower half B of the grayscale picture P1 are respectively divided into a plurality of regions, and the difference of the grayscale values of the adjacent two regions is a predetermined step value, as shown in the above half A, the region A3 When the grayscale step value of the adjacent area A1 exceeds a certain threshold, the area A3 is considered to be a new first order relative to the area A1. Similarly, the area A5 is a new first order relative to the area A3, and the area A2 is opposite to the area A4. For the new first order, that is, the difference between the grayscale values of the adjacent two regions is a predetermined step value, so the grayscale order of the grayscale picture P1 is equal to the number of the plurality of regions divided above. It can be seen from Fig. 2 that the area A1 and the area A2 have a relatively large area, and the areas located between the area A1 and the area A2 have a relatively small area, which is The screen display quality of the electronic device 20 and the exposure time of the image acquisition device 40 have a common influence. Since the area A1 is dark and the area A2 is brighter, the gray levels of the two areas do not change much, so the area The area is relatively large. Similarly, the lower half B also has a similar area division. In other embodiments, whether to divide the grayscale picture P1 into the upper half A and the lower half B depends on the actual needs of the grayscale detection, and may not be divided or divided into more parts.

Similarly, the grayscale picture P2 with a shorter exposure time is divided into an upper half A and a lower half B, the upper half A gradually increases in brightness in the direction of the arrow in the figure, and the lower half B is bright in the direction of the arrow in the figure. slowing shrieking. Then, the upper half A and the lower half B are respectively subjected to the above-described area division, as shown in FIG. 3, thereby obtaining the gray scale order of the gray scale picture P2.

By using the same method, the gray scale order of the synthesized gray scale picture P, that is, the first gray scale order N1 can be obtained, as shown in FIG. Referring to FIG. 5 again, FIG. 5 is a schematic diagram of a standard grayscale picture according to an embodiment of the present invention. The standard grayscale picture is still divided into the upper half A and the lower half B, and the upper half A gradually increases in brightness along the direction of the arrow in the figure, while the lower half B gradually decreases in brightness in the direction of the arrow in the figure, and then The same method yields the standard grayscale order N0 of the standard grayscale picture shown in FIG.

S6, the alignment of the gray scale orders.

The first gray scale order N1 of the synthesized gray scale picture P is compared with the standard gray scale order N0 of the standard detection picture. If the first gray scale order N1 is consistent with the standard gray scale order N0, it is determined that the screen display quality of the electronic device 20 is qualified; if the first gray scale order N1 does not coincide with the standard gray scale order N0, determining the electronic device 20 The screen display quality is unqualified.

In this embodiment, please refer to FIG. 4 and FIG. 5 together, the area division of the synthesized gray scale picture P in FIG. 4 and the area division of the standard gray scale picture in FIG. 5 except for the dotted line frame in the figure. D1 and D2 are different, and the rest are the same. It can be seen that the standard grayscale order N0 of the standard grayscale picture is not equal to the first grayscale order N1 of the synthetic grayscale picture P, and N0 is greater than N1, so the electronic can be judged. The screen display quality of the device 20 is unacceptable. In other embodiments, if the standard grayscale order N0 of the standard grayscale picture is equal to the first grayscale order N1 of the synthesized grayscale picture P, that is, N0 is equal to N1, it can be determined that the picture display quality of the electronic device 20 is qualified. .

In actual operation, the gray scale order of the plurality of gray scale pictures of different exposure times may not be calculated first, and the first gray scale order N1 of the synthesized gray scale picture is directly calculated after synthesizing the plurality of gray scale pictures, thereby Improve the detection efficiency of grayscale images.

In summary, the present invention performs grayscale order acquisition and comparison on the grayscale image generated by the electronic device by the processing unit, thereby improving the detection accuracy and improving the detection efficiency.

The present invention has been described by the above related embodiments, but the above embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the invention. Conversely, modifications and refinements made without departing from the spirit and scope of the invention are the scope of the invention.

100‧‧‧ Gray scale detection device

10‧‧‧Video signal generating device

20‧‧‧Electronic devices

30‧‧‧ imaging screen

40‧‧‧Image acquisition device

50‧‧‧Processing unit

Claims (10)

A grayscale picture detecting method for an electronic device, characterized in that the method comprises the following steps: (1) inputting a standard detection picture to the electronic device, wherein the standard detection picture has a standard gray level order; (2) according to the standard Detecting a signal of the screen, the electronic device generates a grayscale image on the imaging screen thereof, wherein the grayscale image is divided into a plurality of grayscale ranges according to the degree of grayscale brightness; (3) separately acquiring the imaging under multiple shooting conditions a grayscale image on the screen, wherein the plurality of shooting conditions are set according to whether the grayscale image collected by the plurality of grayscale ranges is the clearest; (4) combining the collected grayscale images; and (5) And comparing the first gray scale order of the synthesized gray scale picture with the standard gray scale order, and determining whether the screen display quality of the electronic device is qualified according to the comparison result. The grayscale picture detection method according to claim 1, wherein the step of generating the standard detection picture is further included before the input step of the standard detection picture. The grayscale picture detection method according to claim 1, wherein the grayscale picture displayed on the imaging screen has a plurality of grayscale ranges, and the acquiring of the grayscale image comprises collecting each grayscale range. The picture obtains a plurality of gray scale pictures, and the plurality of gray scale pictures are synthesized to obtain a synthesized gray scale picture. The grayscale picture detection method according to claim 3, wherein the plurality of grayscale pictures respectively have different exposure times. The grayscale picture detection method according to claim 1, wherein the step of acquiring the grayscale picture and the step of matching the gray level order further comprises acquiring the gray level order. The gray-scale picture detection method according to claim 1, wherein the gray-scale order of the gray-scale picture is the number of the plurality of areas divided on the gray-scale picture, wherein the plurality of areas are The difference between the grayscale values of the adjacent regions is a predetermined step value. A grayscale picture detecting device, characterized in that the device comprises: a video signal generating device for generating a signal of a standard detection picture, wherein the standard detection picture has a standard gray level order; and the electronic device is electrically coupled to the video signal a generating device, the electronic device is configured to receive the signal of the standard detection screen and generate a grayscale image according to the signal; and an imaging screen for imaging the grayscale image on the imaging screen, wherein the grayscale image is according to a grayscale The brightness and darkness are divided into a plurality of grayscale ranges; the image acquiring device is configured to separately collect grayscale images on the imaging screen under a plurality of shooting conditions, wherein the plurality of shooting conditions are set according to the plurality of grayscales respectively Whether the grayscale picture acquired by the step range is the clearest; and the processing unit is electrically coupled to the image acquiring device, the processing unit synthesizes the collected grayscale pictures, and firstly combines the grayscale pictures of the synthesized The gray scale order is compared with the standard gray scale order of the standard detection screen, and it is judged whether the screen display quality of the electronic device is qualified according to the comparison result. The grayscale picture detecting device according to claim 7, wherein the grayscale image displayed on the imaging screen has a plurality of grayscale ranges, and the acquiring of the grayscale image comprises collecting each grayscale range. The picture obtains a plurality of gray scale pictures, and the plurality of gray scale pictures are synthesized to obtain a synthesized gray scale picture. The gray scale picture detecting device according to claim 8 is characterized in that the plurality of Grayscale screens have different exposure times. The gray-scale picture detecting apparatus according to claim 7, wherein the gray-scale order of the gray-scale picture is the number of the plurality of areas divided on the gray-scale picture, wherein the plurality of areas are The difference between the grayscale values of the adjacent regions is a predetermined step value.