TWI900161B - LED lamp coordinate calculation method and display calibration system - Google Patents

Abstract

The present invention primarily discloses a method for calculating LED bead coordinates, performed by a display calibration system, and comprising the following steps: capturing P captured images from an LED panel containing Y×X LED beads; wherein X, Y, and P are all positive integers, and the P captured images include four illuminated LED beads, each having position coordinates (1, 1), (1, X), (Y, 1), and (Y, X), respectively; and, based on the position coordinates of the four LED beads, using an interpolation algorithm to calculate the position coordinates of the remaining (Y×X)-4 LED beads one by one. It is worth noting that when the method of the present invention is applied, the display calibration system only needs to perform four image acquisition operations on the LED panel at most to obtain four captured images, and then the position coordinates of each LED lamp bead can be calculated through interpolation calculations, which greatly shortens the operation time of the display calibration operation and improves the overall efficiency.

Description

LED lamp coordinate calculation method and display calibration system

This invention relates to the technical field of factory calibration of LED displays, particularly a method for calculating the coordinates of LED bulbs performed by a display calibration system.

As the application of LED displays expands, market demands for higher resolution and display quality are also increasing. It's understandable that the more LED elements (i.e., sub-pixels) an LED panel has, the higher the resolution of the LED display. Unfortunately, due to manufacturing variations, each LED element in an LED panel cannot achieve exactly the same brightness and color performance.

Figure 1 illustrates the architecture of a conventional display calibration system. As shown in Figure 1, before an LED display 2a is shipped, the manufacturer uses a display calibration system 1a comprising an electronic device 11a (such as a laptop or desktop computer) and an image acquisition device 12a to perform pixel calibration and compensation on the LED display 2a. The image acquisition device 12a can be a high-resolution CCD camera, a spectroradiometer, or a color analyzer. Furthermore, the electronic device 11a is configured to perform a display calibration operation on the LED display 2a. Specifically, the display calibration operation includes the following steps: controlling the LED display 2a to display an image; controlling the image acquisition device 12a to capture an image from an LED panel 21a of the LED display 2a; processing the captured image using an algorithm to obtain the coordinates of a plurality of LED lamps on the LED panel 21a; processing the captured image using an algorithm to obtain the color (or grayscale value) of each LED lamp; calculating the difference between each color (or each grayscale value) and a target color (or target grayscale value); calculating and generating compensation data including a plurality of compensation grayscale values based on the plurality of differences; and writing the compensation data into an LED display driver chip of the LED display 2a.

Under normal circumstances, multiple LEDs in the captured image are neatly arranged, and the edges of each LED are distinct, allowing the edge detection algorithm to determine the coordinates of each LED. Furthermore, when calculating the color (grayscale value) of each LED, the algorithm uses a minimal box to enclose the detected edges and represents the color (grayscale value) of the LED using the pixel information within this box. Unfortunately, when the LED display 2a is equipped with a high-resolution LED panel 21a, as shown in Figure 2, the image capture device 12a cannot clearly capture the distance between two adjacent LEDs, resulting in errors in the calculated coordinates of the LEDs or the inability to calculate the coordinates of some LEDs.

To solve the aforementioned problem, a partitioned point-jumping shooting method is proposed and applied to capture multiple acquired images from the LED panel 21a of the LED display 2a. Figures 3A to 3E are operational diagrams of the existing partitioned point-jumping shooting method. As shown in Figure 3A, first, the LED panel 21a is divided into N×N blocks, for example, 2×2 blocks, namely block (1,1), block (1,2), block (2,1), and block (2,2), wherein the block (1,1) has four LED beads 211a whose block matrix positions (i,j) are (1,1), (1,2), (2,1), and (2,2), respectively. Furthermore, the block (1,2) has two LED beads 211a at block matrix positions (1,1) and (2,1), respectively. On the other hand, the block (2,1) has two LED beads 211a at block matrix positions (1,1) and (1,2), respectively. Furthermore, the block (2,2) has one LED bead 211a at block matrix position (1,1).

Next, as shown in Figures 3B, 3C, 3D, and 3E, the LED beads 211a at the block matrix positions (1,1), (1,2), (2,1), and (2,2) in the block (1,1) are sequentially illuminated. It is noteworthy that when the LED bead 211a at the block matrix position (1,1) in the block (1,1) is illuminated, the LED bead 211a at the block matrix position (1,1) in the block (1,2), the LED bead 211a at the block matrix position (1,1) in the block (2,1), and the LED bead 211a at the block matrix position (1,1) in the block (2,2) are simultaneously illuminated. Similarly, when the LED bead 211a at the block matrix position (1,2) in the block (1,1) is turned on, the LED bead 211a at the block matrix position (1,2) in the block (2,1) is also turned on. Furthermore, when the LED bead 211a at the block matrix position (2,1) in the block (1,1) is turned on, the LED bead 211a at the block matrix position (2,1) in the block (1,2) is also turned on.

As can be easily understood, four captures yield four frames of captured images. Furthermore, as shown in Figure 3B , the distance between LED bead 211a numbered 1 and 211a numbered 3 is twice the set distance between two adjacent LED beads 211a. Similarly, the distance between LED bead 211a numbered 1 and LED beads 211a numbered 7 and 9 is also twice the set distance. This allows the edge detection algorithm to calculate the coordinates of each LED bead 211a.

Unfortunately, as the size and resolution of LED panels increase, the number of frames required to capture the captured images using the partitioned, skipped-point capture method also increases. For example, if the LED panel 21a is divided into 8×8 (or 10×10) blocks, 64 (or 100) frames of captured images must be captured. This results in a significantly longer overall display calibration time and significantly lower efficiency. Therefore, as can be seen from the foregoing, the existing display calibration method using the partitioned, skipped-point capture method has significant drawbacks that require improvement.

From the above explanation, it can be seen that a new method for calculating the coordinates of LED beads is urgently needed in this field.

The primary objective of this invention is to provide a method for calculating LED bead coordinates, which is implemented by a display calibration system and used during a display calibration operation on an LED display. When this method is applied, the overall operation time for the display calibration operation is significantly shortened, thereby significantly improving operational efficiency.

To achieve the above objectives, the present invention provides an embodiment of a method for calculating LED bead coordinates, which is performed by a display calibration system comprising an electronic device and an image capture device. The method comprises: sequentially capturing P captured images from an LED panel comprising Y×X LED beads; wherein X, Y, and P are all positive integers, and the P captured images include four illuminated LED beads, each having position coordinates (1, 1), (1, X), (Y, 1), and (Y, X), respectively; and, based on the position coordinates of the four LED beads, utilizing an interpolation algorithm to calculate the position coordinates of the remaining (Y×X)-4 LED beads one by one.

In one embodiment, each of the captured images includes at least one of the illuminated LED beads.

In one embodiment, when P=1, the display calibration system performs one image capture operation on the LED panel to obtain one captured image, and the captured image includes four illuminated LED beads.

In one embodiment, when P=2, the display calibration system performs two image acquisition operations on the LED panel to obtain two acquired images, and the two acquired images include four illuminated LED beads.

In one embodiment, when P=3, the display calibration system performs three image acquisition operations on the LED panel to obtain three acquired images, and the three acquired images include four illuminated LED beads.

In one embodiment, when P=4, the display calibration system performs four image capture operations on the LED panel to obtain four captured images, and the four captured images include four illuminated LED beads.

In one feasible embodiment, the P captured images further include K additional illuminated LED beads, where K is a positive integer.

In one possible embodiment, the display calibration system utilizes a partitioned point-jumping capture method to perform at least one image capture operation on the LED panel to capture at least one captured image.

In one embodiment, when executing the zoned jump point shooting method, the display calibration system divides the LED panel into N×N shooting blocks, and each of the shooting blocks contains a plurality of the LED beads, where N is a positive integer.

In one embodiment, the interpolation algorithm is any one selected from the group consisting of nearest neighbor interpolation, linear interpolation, bilinear interpolation, bicubic interpolation, and Lagrange polynomial interpolation.

The present invention also provides an embodiment of a display calibration system comprising an electronic device and an image capture device. When the display calibration system is used to perform a display calibration operation on an LED display, the system implements the aforementioned LED lamp coordinate calculation method of the present invention to calculate the coordinates of each LED lamp included in the LED display.

In one embodiment, the image acquisition device is selected from any one of the group consisting of a high-resolution CCD camera, a spectroradiometer, and a color analyzer.

1a: Display calibration system

11a: Electronic devices

12a: Image acquisition device

2a: LED display

21a: LED Panel

211a: LED bulbs

1: Display calibration system

11: Electronic devices

12: Image acquisition device

2: LED display

21: LED Panel

211: LED beads

210: Collecting images

S1: An LED panel containing Y×X LED beads captures P collected images in sequence.

S2: Based on the position coordinates of the four LEDs, use an interpolation algorithm to calculate the position coordinates of the remaining (Y×X)-4 LEDs one by one.

FIG1 is a block diagram of an existing display calibration system; FIG2 is a captured image of an LED panel including a plurality of LED lamp beads captured by the image acquisition device shown in FIG1; FIG3A to FIG3E are operation diagrams of the existing partition jump point shooting method; FIG4 is a block diagram of a display calibration system using an LED lamp bead coordinate calculation method of the present invention; FIG5 is a flow chart of an LED lamp bead coordinate calculation method of the present invention; FIG6 is a diagram of the LED panel of the LED display shown in FIG4; FIG7 is a flow chart of the LED panel shown in FIG6. Figures 8A and 8B are diagrams of two captured images; Figures 9A, 9B, and 9C are diagrams of three captured images; Figures 10A, 10B, 10C, and 10D are diagrams of four captured images; Figure 11 is a first diagram of an LED panel using the zoned jump point photography method; Figure 12 is a diagram of captured images of the LED panel shown in Figure 11; Figure 13 is a second diagram of an LED panel using the zoned jump point photography method; and Figures 14A to 14D are diagrams of four captured images of the LED panel shown in Figure 13.

To help you better understand the structure, features, objectives, and advantages of this invention, we have attached drawings and detailed descriptions of preferred embodiments.

Figure 4 is a diagram of the architecture of a display calibration system that utilizes a method for calculating LED lamp bead coordinates according to the present invention. As shown in Figure 4 , before an LED display 2 leaves the factory, the manufacturer uses a display calibration system 1 comprising an electronic device 11 (such as a laptop or desktop computer) and an image acquisition device 12 to perform pixel calibration and compensation on the LED display 2. The image acquisition device 12 can be a high-resolution CCD camera, a spectroradiometer, or a color analyzer. Furthermore, the electronic device 11 is configured to perform a display calibration operation on the LED display 2. Specifically, the display calibration operation includes the following steps:

(1) Control the LED display 2 to display P images in batches; P is a positive integer;

(2) Control the image acquisition device 12 to capture P images from an LED panel 21 of the LED display 2 in a corresponding manner;

(3) Using an algorithm to process the P collected images to obtain the coordinates of the Y×X LED beads of the LED panel 21; X and Y are both positive integers.

(4) Using an algorithm to process the P collected images to obtain the color (or grayscale value) of each LED bead;

(5) Calculate the difference between each color (or each grayscale value) and a target color (or target grayscale value);

(6) Calculating based on a plurality of differences, generating a compensation data including a plurality of compensation grayscale values; and

(7) Writing the compensation data into an LED display driver chip of the LED display 2.

In particular, when performing the display calibration operation, the display calibration system 1 simultaneously executes a method for calculating the coordinates of the LED beads of the present invention, so as to calculate the coordinates of the Y×X LED beads of the LED panel 21. FIG5 is a flow chart of a method for calculating the coordinates of the LED beads of the present invention. As shown in FIG4 and FIG5, the method flow first executes step S1: P collected images are captured in sequence from an LED panel 21 containing Y×X LED beads. It should be understood that step S1 is the aforementioned steps (1) to (2). It is worth noting that according to the design of the present invention, the P collected images include 4 lit LED beads, and the 4 LED beads have position coordinates (1,1), (1,X), (Y,1), and (Y,X) respectively. Furthermore, each of the captured images includes at least one of the LED beads being lit.

Figure 6 is a diagram of the LED panel of the LED display shown in Figure 4, and Figure 7 is a diagram of a captured image of the LED panel shown in Figure 6. As shown in Figures 4 and 6, the LED panel 21 exemplarily includes 3×3 LED beads 211. Furthermore, as shown in Figures 6 and 7, when P = 1, the display calibration system 1 performs one image capture operation on the LED panel 21 to obtain one captured image 210. The captured image 210 includes four illuminated LED beads 211, and the four LED beads 211 have position coordinates (1, 1), (1, 3), (3, 1), and (3, 3), respectively.

Continuing, the method flow then executes step S2: Based on the position coordinates of the four LED lamp beads 211, an interpolation algorithm is used to calculate the position coordinates of the remaining (Y×X)-4 LED lamp beads 211 one by one. It should be understood that step S3 is the aforementioned step (3). In one embodiment, the electronic device 11 executes an edge detection algorithm based on bilinear interpolation, thereby deriving and calculating the other (3×3)-4 position coordinates based on the four position coordinates (1,1), (1,3), (3,1), and (3,3). To explain in more detail, the edges of the four LEDs 211 shown in Figure 7 are distinct, so an edge detection algorithm can be used to determine the position coordinates of each LED 211. After obtaining the four position coordinates (1,1), (1,3), (3,1), and (3,3), the electronic device 11 then calculates the remaining (3×3) position coordinates by performing multiple bilinear interpolation operations.

Computer science (CS) engineers familiar with image processing will undoubtedly understand that, in addition to bilinear interpolation, nearest neighbor interpolation, linear interpolation, bicubic interpolation, and Lagrange polynomial interpolation are all commonly used to process multiple pixels within a frame of image. In other words, the electronic device 11 can be configured to use any of the aforementioned interpolation algorithms to complete step S2.

Furthermore, Figures 8A and 8B are diagrams of two captured images. As shown in Figures 5, 6, 8A, and 8B, when executing the LED lamp bead coordinate calculation method of the present invention, P can also be optionally set to 2. Thus, when P = 2, the display calibration system 1 performs two image capture operations on the LED panel 21 to obtain two captured images 210, and the two captured images 210 include four illuminated LED lamp beads 211. To explain in more detail, the first captured image 210 shown in Figure 8A includes two illuminated LED lamp beads 211, having coordinate positions (1, 1) and (1, 3) respectively. In contrast, the second captured image 210 shown in FIG8B includes two illuminated LED beads 211, with coordinate positions (3, 1) and (3, 3), respectively. Thus, when P = 2, the two captured images 210 obtained by executing step S1 include four illuminated LED beads 211, with coordinate positions (1, 1), (1, 3), (3, 1), and (3, 3), respectively.

On the other hand, Figures 9A, 9B, and 9C illustrate three captured images. As shown in Figures 5, 6, 9A, 9B, and 9C, when executing the LED bead coordinate calculation method of the present invention, P can optionally be set to 3. Thus, when P = 3, the display calibration system 1 performs three image capture operations on the LED panel 21 to obtain three captured images, each of which includes four illuminated LED beads 211. More specifically, the first captured image 210 shown in Figure 9A includes one illuminated LED bead 211 at coordinate position (1, 1). Furthermore, the second captured image 210 shown in FIG9B includes two illuminated LED beads 211, having coordinate positions (3, 1) and (3, 3), respectively. Meanwhile, the third captured image 210 shown in FIG9B includes one illuminated LED bead 211, having a coordinate position (1, 3). Thus, when P = 3, the three captured images 210 obtained by executing step S1 include four illuminated LED beads 211, having coordinate positions (1, 1), (1, 3), (3, 1), and (3, 3), respectively.

Furthermore, Figures 10A, 10B, 10C, and 10D illustrate four captured images. As shown in Figures 5, 6, 10A, 10B, 10C, and 10D, when executing the LED bead coordinate calculation method of the present invention, P can optionally be set to 4. Thus, when P = 4, the display calibration system 1 performs four image capture operations on the LED panel 21 to obtain four captured images, each of which includes four illuminated LED beads 211. To explain in more detail, the first, second, third, and fourth captured images 210 shown in Figures 10A, 10B, 10C, and 10D each contain a lit LED bead 211, whose coordinate positions are (1,1), (1,3), (3,1), and (3,3), respectively. Thus, when P = 4, the four captured images 210 obtained by executing step S1 contain four lit LED bead 211, with coordinate positions (1,1), (1,3), (3,1), and (3,3), respectively.

In practical applications, the display calibration system 1 may also utilize a partitioned point-skipping capture method to perform at least one image capture operation on the LED panel 21 comprising the Y×X LED beads 211 to capture at least one captured image 210. The at least one captured image 210 includes four illuminated LED beads 211, each having position coordinates (1, 1), (1, X), (Y, 1), and (Y, X).

FIG11 is a first diagram of an LED panel using the partitioned point-jumping photography method, and FIG12 is a diagram of a captured image of the LED panel shown in FIG11 . When the partitioned point-jumping photography method and the LED lamp coordinate calculation method of the present invention are simultaneously applied, as shown in FIG11 , the LED panel 21 is divided into N×N blocks, for example, 2×2 blocks, namely, block (1,1), block (1,2), block (2,1), and block (2,2). Block (1,1) has four LED lamps 211 with block matrix positions (i,j) being (1,1), (1,2), (2,1), and (2,2), respectively. Furthermore, the block (1,2) has two LED beads 211 at block matrix positions (1,1) and (2,1) respectively. On the other hand, the block (2,1) has two LED beads 211 at block matrix positions (1,1) and (1,2) respectively. Furthermore, the block (2,2) has one LED bead 211 at block matrix position (1,1).

Next, as shown in Figures 11 and 12, the LED bead 211 at the block matrix position (1,1) in the block (1,1) is turned on. It is worth noting that, when P = 1, when the LED bead 211 at the block matrix position (1,1) in the block (1,1) is turned on, the LED bead 211 at the block matrix position (1,1) in the block (1,2), the LED bead 211 at the block matrix position (1,1) in the block (2,1), and the LED bead 211 at the block matrix position (1,1) in the block (2,2) are also turned on simultaneously. Thus, when P=1, the four captured images 210 obtained by executing step S1 include four illuminated LED beads 211, with coordinate positions (1,1), (1,3), (3,1), and (3,3) respectively.

Furthermore, FIG. 13 is a second diagram of an LED panel to which the partitioned point-jumping shooting method is applied, and FIG. 14A to FIG. 14D are diagrams of four captured images of the LED panel shown in FIG. 13 . When the partitioned point-jumping shooting method and the LED lamp bead coordinate calculation method of the present invention are applied simultaneously, as shown in FIG13 , the LED panel 21 is divided into N×N blocks, for example, 2×2 blocks, namely block (1,1), block (1,2), block (2,1), and block (2,2). Each of the blocks has nine LED lamp beads 211 with block matrix positions (i,j) of (1,1), (1,2), (1,3), (2,1), (2,2), (2,3), (3,1), (3,2), and (3,3).

Next, as shown in Figures 13 and 14A to 14D, the LED beads 211 at the matrix positions (1,1), (1,3), (3,1), and (3,3) in the block (1,1) are sequentially illuminated. It is worth noting that, when P = 4, when the LED bead 211 at the matrix position (1,1) in the block (1,1) is illuminated, the LED bead 211 at the matrix position (1,1) in the block (1,2), the block (2,1), and the block (2,2) are also illuminated simultaneously. Furthermore, when the LED bead 211 at the block matrix position (1,3) in the block (1,1) is turned on, the LED bead 211 at the block matrix position (1,3) in the block (1,2), the block (2,1), and the block (2,2) is turned on simultaneously. On the other hand, when the LED bead 211 at the block matrix position (3,1) in the block (1,1) is turned on, the LED bead 211 at the block matrix position (3,1) in the block (1,2), the block (2,1), and the block (2,2) is turned on simultaneously. Furthermore, when the LED bead 211 at the block matrix position (3,1) in the block (1,1) is turned on, the LED bead 211 at the block matrix position (3,1) in the block (1,2), the block (2,1), and the block (2,2) are also turned on simultaneously.

Thus, when P=4, the four collected images 210 obtained by executing step S1 include four lit LED beads 211, having coordinate positions (1,1), (1,3), (3,1), and (3,3), that is, the four LED beads 211 numbered 1, 6, 31, and 36. Furthermore, as can be seen from Figures 14A to 14D, the four captured images 210 also include 12 illuminated LED beads 211 at coordinates (1,4), (4,1), (4,4), (1,3), (4,3), (4,6), (3,1), (3,4), (6,4), (3,3), (3,6), and (6,3), i.e., numbered 4, 19, 22, 3, 21, 24, 13, 16, 34, 15, 18, and 33.

In summary, the LED lamp coordinate calculation method of the present invention has been fully and clearly explained. Furthermore, it can be seen from the above that the present invention has the following advantages:

(1) The present invention provides a method for calculating the coordinates of LED lamp beads, which is executed by a display calibration system and used in performing a display calibration operation on an LED display. When the LED lamp bead coordinate calculation method of the present invention is applied, the overall operation time of the display calibration operation is significantly shortened, thereby significantly improving the operating efficiency.

(2) Furthermore, the present invention also provides an embodiment of a display calibration system, which includes an electronic device and an image acquisition device; the characteristic of the display calibration system is that when the display calibration system is used to perform a display calibration operation on an LED display, the display calibration system executes the LED lamp bead coordinate calculation method of the present invention as described above, thereby calculating the coordinates of each LED lamp bead included in the LED display.

It must be emphasized that the aforementioned disclosure of this case is a preferred embodiment. Any partial changes or modifications that are derived from the technical concept of this case and are easily inferred by those skilled in the art do not deviate from the scope of the patent rights of this case.

In summary, this case demonstrates significant differences from known technologies in terms of purpose, means, and effects. Furthermore, its first invention is practical and truly meets the patent requirements for invention. We sincerely request the Review Commission to carefully examine this matter and grant a patent to this invention as soon as possible to benefit society. This is our utmost prayer.

S1: An LED panel containing Y×X LED beads captures P collected images in sequence.

S2: Based on the position coordinates of the four LEDs, use an interpolation algorithm to calculate the position coordinates of the remaining (Y×X)-4 LEDs one by one.

Claims (11)

A method for calculating the coordinates of LED lamp beads is performed by a display calibration system including an electronic device and an image acquisition device, and includes:              P acquired images are captured in sequence from an LED panel including Y×X LED lamp beads; wherein X, Y, and P are all positive integers, and the P acquired images include 4 of the LED lamp beads that are lit, and the 4 LED lamp beads have position coordinates (1,1), (1,X), (Y,1), and (Y,X), respectively; and              Based on the position coordinates of the 4 LED lamp beads, an interpolation algorithm is used to calculate the position coordinates of the remaining (Y×X)-4 LED lamp beads one by one;              wherein each of the acquired images includes at least 1 of the LED lamp beads that is lit. The LED lamp bead coordinate calculation method as described in claim 1, wherein, when P=1, the display calibration system performs one image acquisition operation on the LED panel to obtain one acquired image, and the acquired image includes four of the LED lamp beads that are lit. The LED lamp bead coordinate calculation method as described in claim 1, wherein, when P=2, the display calibration system performs two image acquisition operations on the LED panel to obtain two captured images, and the two captured images include four lit LED lamp beads. The LED lamp bead coordinate calculation method as described in claim 1, wherein, when P=3, the display calibration system performs three image acquisition operations on the LED panel to obtain three captured images, and the three captured images include four of the LED lamp beads that are lit. The LED lamp bead coordinate calculation method as described in claim 1, wherein, when P=4, the display calibration system performs four image acquisition operations on the LED panel to obtain four captured images, and the four captured images include four illuminated LED lamp beads. The method for calculating the coordinates of LED lamp beads as described in claim 1, wherein the P collected images also include another K lit LED lamp beads, where K is a positive integer. As described in claim 1, the LED lamp bead coordinate calculation method, wherein the display calibration system uses a partitioned jump point shooting method to perform at least one image capture operation on the LED panel to capture at least one captured image. As described in claim 7, when executing the partitioned jump point shooting method, the display calibration system divides the LED panel into N×N shooting blocks, and each of the shooting blocks contains a plurality of the LED beads, where N is a positive integer. The method for calculating LED bulb coordinates as described in claim 1, wherein the interpolation algorithm is selected from the group consisting of nearest neighbor interpolation, linear interpolation, bilinear interpolation, bicubic interpolation, and Lagrange polynomial interpolation. A display calibration system includes an electronic device and an image acquisition device. When the display calibration system is used to perform a display calibration operation on an LED display, the system executes the LED lamp bead coordinate calculation method described in any one of claims 1 to 9 to calculate the coordinates of each LED lamp bead included in the LED display. The display calibration system of claim 10, wherein the image acquisition device is any one selected from the group consisting of a high-resolution CCD camera, a spectroradiometer, and a color analyzer.