A system and method for measuring the length of H-beams in a cooling bed.

Abstract

This invention relates to a length measurement system and method for H-beams on a cooling bed, belonging to the field of quality control technology in the metallurgical industry. The technical solution is as follows: a camera group (1) collects images of steel on the cooling bed and transmits them to a recognition computer (2). The recognition computer reads the steel arrival signal from the cooling bed roller conveyor PLC (3) and determines whether the steel is in place. If the steel is in place, the recognition computer reads the images from the camera group, performs image analysis to identify the position of the steel, calculates the actual length of the steel based on the scale drawn on site, sends it to the cooling bed roller conveyor PLC (3), and reads the billet weight from the database (4) to calculate the negative difference and record it in a report (5). This invention has low investment costs, uses image recognition to calculate the length of steel, improves the accuracy of data, reduces the labor intensity of workers, and can calculate the negative difference, which helps to improve production efficiency, reduce errors in the production process, and ensure that the produced steel can meet customer needs and industry standards.

Description

Technical Field

[0001] This invention relates to a length measurement system and method for medium H-beams on a cold bed, belonging to the field of quality control technology in the metallurgical industry. Background Technology

[0002] Medium H-beams refer to steel with specifications ranging from H200*200 to H500*200. Currently, steel rolling mills in steel enterprises use the tail end of the rolled steel section as a reference to transport it to the cooling bed, where the length of the steel is estimated on-site. However, there is no steel section length measurement system, resulting in inaccurate data reports for the rolled steel section. This leads to low data accuracy, high labor intensity for workers, low production efficiency, and a high risk of errors during the production process. Consequently, it cannot be guaranteed that the produced steel will meet customer needs and industry standards. Summary of the Invention

[0003] The purpose of this invention is to provide a length measurement system and method for H-beams on a cooling bed. When steel is detected, the system automatically calculates the length of the steel and records the negative error in a report. Continuous casting can adjust the measurement according to the actual length of the steel to ensure that the final product meets the requirements. This helps to improve production efficiency, reduce errors in the production process, and ensure that the steel meets customer needs and industry standards, thus solving the problems existing in the background technology.

[0004] The technical solution of this invention is: A length measurement system for H-beams on a cooling bed includes a camera group, a recognition computer, a cooling bed roller conveyor PLC, a database, and a recording report. The camera group, the cooling bed roller conveyor PLC, and the database are all connected to the recognition computer. The camera group is used to capture images of the steel billets on the cooling bed and transmit them to the recognition computer. The recognition computer is used to read the steel arrival signal from the cooling bed roller conveyor PLC and determine whether the steel is in place. If the steel is in place, the recognition computer reads the image from the camera group, performs image analysis to identify the position of the steel, calculates the actual length of the steel based on the scale drawn on site, sends it to the cooling bed roller conveyor PLC, and reads the weight of the steel billet from the database to calculate the negative difference and generate a recording report.

[0005] The camera group consists of four cameras: a tail camera, a 10x zoom camera, an 11x zoom camera, and a 12x zoom camera. The tail camera is located at the tail of the cooling bed, while the 10x, 11x, and 12x cameras are located at the head of the cooling bed. The recognition computer analyzes the images of the steel on the cooling bed captured by the camera group, which is divided into two processes: tail analysis and head analysis. The tail analysis analyzes the images of the steel on the cooling bed captured by the tail camera, while the head analysis analyzes the images of the steel on the cooling bed captured by the 10x, 11x, and 12x cameras. The head analysis process is only performed if the tail analysis program detects the presence of steel.

[0006] The specific steps of the cooling bed tail analysis program are as follows: First, analyze the image captured by the cooling bed tail camera, set the coordinate range of the steel pixel points to be identified (xa1, ha1), (xa1, ha2), (xa2, ha1), (xa2, ha2), RGB threshold and contour area threshold (Minimum Area), set the RGB of the pixels within the coordinate range that meet the threshold requirements to (255, 255, 255), set the RGB of other pixels to (0, 0, 0), and do not process the pixels outside the coordinate range; perform contour detection on the processed image within the coordinate range, calculate the contour area (Area), if the contour area (Area) is greater than the contour area threshold (Minimum Area), then it is considered that there is steel, and the cooling bed head recognition is performed.

[0007] The specific steps of the cooling bed head recognition program are as follows: First, analyze the image captured by the 10x magnification camera, set the coordinate range of the steel pixel points to be recognized (xn1, hn1), (xn1, hn2), (xn2, hn1), (xn2, hn2) and the maximum X-axis coordinate Xmax, set the RGB of the pixels within the coordinate range that meet the threshold requirements to (255, 255, 255), set the RGB of other pixels to (0, 0, 0), and do not process the pixels outside the coordinate range; perform contour detection on the processed image within the coordinate range to calculate the contour area Area. If the contour area Area is greater than the contour area threshold Minimum, then... The area is considered to contain steel. The X-axis coordinate X10 of the largest pixel in the contour is taken. If X10 is less than Xmax, the calculation program is started. If X10 is greater than Xmax, the analysis of the 10x camera is terminated, and the analysis of the image taken by the 11x camera is started. The same operation is performed as the image taken by the 10x camera. The X-axis coordinate X11 of the largest pixel in the contour is taken. If X11 is less than Xmax, the calculation program is started. If X11 is greater than Xmax, the analysis of the 11x camera is terminated, and the analysis of the image taken by the 12x camera is started. The same operation is performed as the image taken by the 10x camera. The X-axis coordinate X12 of the largest pixel in the contour is taken and the calculation program is started.

[0008] The calculation program first sets up a coordinate list C10, C11, C12 and a length list L10, L11, L12, then uses interpolation to calculate the length and reads the billet weight data from the database, calculates the negative difference and creates a record report.

[0009] A method for using a medium H-beam steel cooling bed steel length measurement system includes the following steps: a camera group acquires images of the steel on the cooling bed and transmits them to a recognition computer. The recognition computer reads the steel arrival signal from the cooling bed roller conveyor PLC, determines whether the steel is in place, and if the steel is in place, the recognition computer reads the images from the camera group, performs image analysis to identify the position of the steel, calculates the actual length of the steel based on the scale drawn on site, sends it to the cooling bed roller conveyor PLC, reads the billet weight from the database, calculates the negative difference, and generates a record report.

[0010] The specific steps are as follows: ① The camera group captures images of steel on the cooling bed and transmits them to the recognition computer. The recognition computer reads the steel arrival signal from the PLC of the cooling bed roller conveyor and determines whether the steel is in place. If the steel is in place, the recognition computer reads the image from the camera group. ② The computer's recognition program first analyzes the image captured by the camera at the tail of the cooling bed, sets the coordinate range of the steel pixel points to be recognized (xa1, ha1), (xa1, ha2), (xa2, ha1), (xa2, ha2), RGB threshold and contour area threshold (Minimum Area), sets the RGB of pixels within the coordinate range that meet the threshold requirements to (255, 255, 255), sets the RGB of other pixels to (0, 0, 0), and does not process pixels outside the coordinate range; performs contour detection on the processed image within the coordinate range, calculates the contour area (Area), and if the contour area (Area) is greater than the contour area threshold (Minimum Area), it is considered that there is steel, and the head of the cooling bed is recognized; ③ The cooling bed head recognition program first analyzes the image captured by the 10x magnification camera, sets the coordinate range of the steel pixel points to be recognized as (xn1, hn1), (xn1, hn2), (xn2, hn1), (xn2, hn2), and the maximum X-axis coordinate Xmax. Pixels within the coordinate range that meet the threshold requirements are set to RGB values ​​of (255, 255, 255), while other pixels are set to RGB values ​​of (0, 0, 0). Pixels outside the coordinate range are not processed. Contour detection is then performed on the processed image within the coordinate range, and the contour area (Area) is calculated. If the contour area (Area) is greater than the contour area threshold (Minimum), the program will proceed accordingly. The area is considered to contain steel. The X-axis coordinate X10 of the largest pixel in the contour is taken. If X10 is less than Xmax, the calculation program is entered. If X10 is greater than Xmax, the analysis of the 10x camera is terminated, and the analysis of the image taken by the 11x camera is started. The same operation is performed as the image taken by the 10x camera. The X-axis coordinate X11 of the largest pixel in the contour is taken. If X11 is less than Xmax, the calculation program is entered. If X11 is greater than Xmax, the analysis of the 11x camera is terminated, and the analysis of the image taken by the 12x camera is started. The same operation is performed as the image taken by the 10x camera. The X-axis coordinate X12 of the largest pixel in the contour is taken and the calculation program is entered. ④ The calculation program first sets the coordinate list C10, C11, C12 and the length list L10, L11, L12, uses interpolation to calculate the length and reads the billet weight data from the database, calculates the negative difference and creates a record report.

[0011] The formula for calculating the length in step ④ is: In the formula, L is the calculated length of the steel section, X is the X-axis coordinate of the largest pixel in the contour, C_min is the coordinate to the left of X in the corresponding coordinate list, L_min is the length value corresponding to C_min in the length list, C_max is the coordinate to the right of X in the corresponding coordinate list, and L_max is the length value corresponding to C_max in the length list.

[0012] The beneficial effects of this invention are: low investment cost; using image recognition to calculate the length of steel improves data accuracy, reduces the labor intensity of workers, and can calculate negative differences, which helps to improve production efficiency, reduce errors in the production process, and ensure that the produced steel can meet customer needs and industry standards; at the same time, it realizes online detection throughout the process and improves the level of intelligent control. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the system of the present invention; Figure 2 This is a diagram showing the distribution of the camera group in this invention; Figure 3This is a physical image of the steel pixel recognition coordinates according to the present invention; Figure 4 This is a flowchart of the present invention; In the diagram: Camera group 1, cooling bed tail camera 1A, 10x camera 1B, 11x camera 1C, 12x camera 1D, recognition computer 2, cooling bed roller conveyor PLC 3, database 4, recording report 5. Detailed Implementation

[0014] The invention will be further illustrated below with reference to the accompanying drawings and examples.

[0015] In this embodiment, refer to the appendix. Figure 1 , 4 A length measurement system for H-beams on a cooling bed includes a camera group 1, a recognition computer 2, a cooling bed roller conveyor PLC 3, a database 4, and a recording report 5. The camera group 1, the cooling bed roller conveyor PLC 3, and the database 4 are all connected to the recognition computer 2. The camera group 1 captures images of the steel billets on the cooling bed and transmits them to the recognition computer 2. The recognition computer 2 reads the steel arrival signal from the cooling bed roller conveyor PLC 3 and determines whether the steel is in place. If the steel is in place, the recognition computer 2 reads the image from the camera group 1, performs image analysis to identify the position of the steel, calculates the actual length of the steel based on the scale drawn on site, sends it to the cooling bed roller conveyor PLC 3, and reads the weight of the steel billet from the database 4 to calculate the negative difference and record it in the report 5.

[0016] See attached document Figure 2 The camera group 1 consists of four cameras: a camera 1A at the tail of the cooling bed, a 10x magnification camera 1B, an 11x magnification camera 1C, and a 12x magnification camera 1D. Camera 1A is located at the tail of the cooling bed with a field of view of 0-10 meters from the cooling bed; camera 1B is located at the tail of the cooling bed with a field of view of 120-128 meters from the cooling bed; camera 1C is located at the tail of the cooling bed with a field of view of 132-140 meters from the cooling bed; and camera 1D is located at the tail of the cooling bed with a field of view of 120-128 meters from the cooling bed. The range is 144-152 meters of the cooling bed; the identification computer 2 analyzes the images of the steel on the cooling bed collected by the camera group 1, which is divided into two processes: cooling bed tail analysis and cooling bed head analysis. The cooling bed tail analysis analyzes the images of the steel on the cooling bed collected by the cooling bed tail camera 1A, and the cooling bed head analysis analyzes the images of the steel on the cooling bed collected by the 10x camera 1B, 11x camera 1C and 12x camera 1D. The cooling bed head analysis program is only performed if the cooling bed tail analysis program detects the presence of steel.

[0017] See attached document Figure 3The recognition program of the recognition computer 2 first analyzes the image captured by the camera 1A at the tail of the cooling bed, sets the coordinate range of the steel pixel points to be recognized (xa1, ha1), (xa1, ha2), (xa2, ha1), (xa2, ha2), RGB threshold and contour area threshold Minimum Area, sets the RGB of the pixels within the coordinate range that meet the threshold requirements to (255, 255, 255), and sets the RGB of other pixels to (0, 0, 0), and does not process the pixels outside the coordinate range; performs contour detection on the processed image within the coordinate range, calculates the contour area Area, and if the contour area Area is greater than the contour area threshold Minimum Area, it is considered that there is steel, and the head of the cooling bed is recognized.

[0018] Where (xa1, ha1) = (0, 500) (xa1, ha2) = (1800,500) (xa2, ha1) = (0, 600) (xa2, ha2) = (1800,600) Threshold requirements: R>230, Minimum Area=10000.

[0019] The cooling bed head recognition program first analyzes the image captured by the 10x magnification camera 1B, sets the coordinate range of the steel pixel points to be recognized as (xn1, hn1), (xn1, hn2), (xn2, hn1), (xn2, hn2), and the maximum X-axis coordinate Xmax. Pixels within the coordinate range that meet the threshold requirements are set to RGB values ​​of (255, 255, 255), while other pixels are set to RGB values ​​of (0, 0, 0). Pixels outside the coordinate range are not processed. The processed image within the coordinate range is then subjected to contour detection to calculate the contour area (Area). If the contour area (Area) is greater than the contour area threshold (Minimum), then... The area is considered to contain steel. The X-axis coordinate X10 of the largest pixel in the contour is taken. If X10 is less than Xmax, the calculation program is entered. If X10 is greater than Xmax, the analysis of the 10x camera 1B is terminated, and the analysis of the image taken by the 11x camera 1C is started. The same operation is performed as the image taken by the 10x camera 1B. The X-axis coordinate X11 of the largest pixel in the contour is taken. If X11 is less than Xmax, the calculation program is entered. If X11 is greater than Xmax, the analysis of the 11x camera 1C is terminated, and the analysis of the image taken by the 12x camera 1D is started. The same operation is performed as the image taken by the 10x camera 1B. The X-axis coordinate X12 of the largest pixel in the contour is taken, and the calculation program is entered.

[0020] The calculation program first sets up a coordinate list C10, C11, C12 and a length list L10, L11, L12, then uses interpolation to calculate the length and reads the billet weight data from database 4, calculates the negative difference and creates a record report 5.

[0021] Where C10 = [80, 200, 300, 420, 600, 750, 920, 1100, 1240], L10=[120.0,121.0,122.0,123.0,124.0,125.0,126.0,127.0,128.0]; C11=[80,200,300,420,600,750,920,1100,1240], L11=[132.0,133.0,134.0,135.0,136.0,137.0,138.0,139.0,140.0]; C12=[80,200,300,420,600,750,920,1100,1240], L12=[144.0,145.0,146.0,147.0,148.0,149.0,150.0,151.0,152.0]; Length calculation formula: In the formula, L is the calculated length of the steel section, X is the X-axis coordinate of the largest pixel in the contour, C_min is the coordinate to the left of X in the corresponding coordinate list, L_min is the length value corresponding to C_min in the length list, C_max is the coordinate to the right of X in the corresponding coordinate list, and L_max is the length value corresponding to C_max in the length list.

[0022] This invention has a 100% recognition rate for normally rolled steel, with a length error within 100mm.

[0023] A method for using a medium H-beam cold bed steel length measurement system includes the following steps: Camera group 1 acquires images of the steel on the cold bed and transmits them to recognition computer 2. Recognition computer 2 reads the steel arrival signal from the cold bed roller conveyor PLC3 and determines whether the steel is in place. If the steel is in place, recognition computer 2 reads the image from camera group 1, performs image analysis to identify the position of the steel, calculates the actual length of the steel based on the scale drawn on site, sends it to the cold bed roller conveyor PLC3, and reads the billet weight from database 4 to calculate the negative difference and generate a record report 5.

[0024] The specific steps are as follows: ① Camera group 1 collects images of steel on the cooling bed and transmits them to recognition computer 2. Recognition computer 2 reads the steel arrival signal from the cooling bed roller conveyor PLC3 and determines whether the steel is in place. If the steel is in place, recognition computer 2 reads the image from camera group 1. ② The recognition program of computer 2 first analyzes the image captured by camera 1A at the tail of the cooling bed, sets the coordinate range of the steel pixel points to be recognized (xa1, ha1), (xa1, ha2), (xa2, ha1), (xa2, ha2), RGB threshold and contour area threshold (Minimum Area), sets the RGB of the pixels within the coordinate range that meet the threshold requirements to (255, 255, 255), sets the RGB of other pixels to (0, 0, 0), and does not process the pixels outside the coordinate range; performs contour detection on the processed image within the coordinate range, calculates the contour area (Area), and if the contour area (Area) is greater than the contour area threshold (Minimum Area), it is considered that there is steel, and the head of the cooling bed is recognized. ③ The cooling bed head recognition program first analyzes the image captured by the 10x magnification camera 1B, sets the coordinate range of the steel pixel points to be recognized as (xn1, hn1), (xn1, hn2), (xn2, hn1), (xn2, hn2), and the maximum X-axis coordinate Xmax. Pixels within the coordinate range that meet the threshold requirements are set to RGB values ​​of (255, 255, 255), while other pixels are set to RGB values ​​of (0, 0, 0). Pixels outside the coordinate range are not processed. Contour detection is then performed on the processed image within the coordinate range, and the contour area (Area) is calculated. If the contour area (Area) is greater than the contour area threshold (Minimum), the program will proceed accordingly. The area is considered to contain steel. The X-axis coordinate X10 of the largest pixel in the contour is taken. If X10 is less than Xmax, the calculation program is entered. If X10 is greater than Xmax, the analysis of the 10x camera 1B is terminated, and the analysis of the image taken by the 11x camera 1C is started. The same operation is performed as the image taken by the 10x camera 1B. The X-axis coordinate X11 of the largest pixel in the contour is taken. If X11 is less than Xmax, the calculation program is entered. If X11 is greater than Xmax, the analysis of the 11x camera 1C is terminated, and the analysis of the image taken by the 12x camera 1D is started. The same operation is performed as the image taken by the 10x camera 1B. The X-axis coordinate X12 of the largest pixel in the contour is taken and the calculation program is entered. ④ The calculation program first sets the coordinate list C10, C11, C12 and the length list L10, L11, L12, uses interpolation to calculate the length and reads the billet weight data from the database 4, calculates the negative difference and creates a record report 5.

Claims

1. A H-beam cold bed type steel length measuring system, characterized in that: It includes a camera group (1), an identification computer (2), a cooling bed roller conveyor PLC (3), a database (4), and a record report (5). The camera group (1), the cooling bed roller conveyor PLC (3), and the database (4) are all connected to the identification computer (2). The camera group (1) is used to collect images of the steel billet on the cooling bed and transmit them to the identification computer (2). The identification computer (2) is used to read the steel arrival signal from the cooling bed roller conveyor PLC (3) and determine whether the steel is in place. If the steel is in place, the identification computer (2) reads the image from the camera group (1), performs image analysis to identify the position of the steel, calculates the actual length of the steel according to the scale drawn on site and sends it to the cooling bed roller conveyor PLC (3), and reads the weight of the steel billet from the database (4) to calculate the negative difference and make a record report (5). The camera group (1) consists of four cameras: a tail camera (1A), a 10x camera (1B), an 11x camera (1C), and a 12x camera (1D). The tail camera (1A) is located at the tail of the cooling bed, while the 10x camera (1B), 11x camera (1C), and 12x camera (1D) are located at the head of the cooling bed. The recognition computer (2) analyzes the images of the steel on the cooling bed collected by the camera group (1), which is divided into two processes: tail analysis and head analysis. The tail analysis analyzes the images of the steel on the cooling bed collected by the tail camera (1A), while the head analysis analyzes the images of the steel on the cooling bed collected by the 10x camera (1B), 11x camera (1C), and 12x camera (1D). The head analysis is performed only when the tail analysis program detects the presence of steel. The specific steps of the cooling bed tail analysis program are as follows: First, analyze the image captured by the cooling bed tail camera (1A), set the coordinate range of the steel pixel points to be identified (xa1, ha1), (xa1, ha2), (xa2, ha1), (xa2, ha2), RGB threshold and contour area threshold Minimum Area, set the RGB of the pixels within the coordinate range that meet the threshold requirements to (255, 255, 255), set the RGB of other pixels to (0, 0, 0), and do not process the pixels outside the coordinate range; perform contour detection on the processed image within the coordinate range, calculate the contour area Area, and if the contour area Area is greater than the contour area threshold Minimum Area, it is considered that there is steel, and the cooling bed head recognition is performed; The specific steps of the cooling bed head recognition program are as follows: First, analyze the image captured by the 10x magnification camera (1B), set the coordinate range of the steel pixel points to be recognized as (xn1, hn1), (xn1, hn2), (xn2, hn1), (xn2, hn2) and the maximum X-axis coordinate Xmax, set the RGB of the pixels within the coordinate range that meet the threshold requirements to (255, 255, 255), set the RGB of other pixels to (0, 0, 0), and do not process the pixels outside the coordinate range; perform contour detection on the processed image within the coordinate range to calculate the contour area Area. If the contour area Area is greater than the contour area threshold Minimum, then... The area is considered to contain steel. The X-axis coordinate X10 of the largest pixel in the contour is taken. If X10 is less than Xmax, the calculation program is entered. If X10 is greater than Xmax, the analysis of the 10x camera (1B) is terminated, and the analysis of the image taken by the 11x camera (1C) is started. The same operation is performed as the image taken by the 10x camera (1B). The X-axis coordinate X11 of the largest pixel in the contour is taken. If X11 is less than Xmax, the calculation program is entered. If X11 is greater than Xmax, the analysis of the 11x camera (1C) is terminated, and the analysis of the image taken by the 12x camera (1D) is started. The same operation is performed as the image taken by the 10x camera (1B). The X-axis coordinate X12 of the largest pixel in the contour is taken and the calculation program is entered.

2. The H-shaped steel cooling bed length measuring system according to claim 1, characterized in that: The calculation procedure is as follows: first, set the coordinate list C10, C11, C12 and the length list L10, L11, L12, use interpolation to calculate the length and read the billet weight data from the database (4), calculate the negative difference and make a record report (5).

3. A method of using a H-beam cold bed type steel length measuring system, characterized in that The process includes the following steps: the camera group (1) collects images of the steel on the cooling bed and transmits them to the recognition computer (2). The recognition computer (2) reads the steel arrival signal from the cooling bed roller conveyor PLC (3) and determines whether the steel is in place. If the steel is in place, the recognition computer (2) reads the image from the camera group (1), performs image analysis to identify the position of the steel, calculates the actual length of the steel based on the scale drawn on site, sends it to the cooling bed roller conveyor PLC (3), and reads the billet weight from the database (4) to calculate the negative difference and make a record report (5). The specific steps are as follows: ① The camera group (1) collects images of steel on the cooling bed and transmits them to the recognition computer (2). The recognition computer (2) reads the steel arrival signal from the PLC (3) of the cooling bed roller conveyor and determines whether the steel is in place. If the steel is in place, the recognition computer (2) reads the image of the camera group (1). ②The recognition program of the computer (2) first analyzes the image captured by the camera (1A) at the tail of the cold bed, sets the coordinate range of the steel pixel points (xa1, ha1), (xa1, ha2), (xa2, ha1), (xa2, ha2), RGB threshold and contour area threshold Minimum Area, sets the RGB of the pixels within the coordinate range that meet the threshold requirements to (255, 255, 255), and sets the RGB of other pixels to (0, 0, 0), and does not process the pixels outside the coordinate range; performs contour detection on the processed image within the coordinate range, calculates the contour area Area, and if the contour area Area is greater than the contour area threshold Minimum Area, it is considered that there is steel, and the head of the cold bed is recognized. ③ The cooling bed head recognition program first analyzes the image captured by the 10x magnification camera (1B), sets the coordinate range of the steel pixel points to be recognized as (xn1, hn1), (xn1, hn2), (xn2, hn1), (xn2, hn2), and the maximum X-axis coordinate Xmax. Pixels within the coordinate range that meet the threshold requirements are set to RGB values ​​of (255, 255, 255), while other pixels are set to RGB values ​​of (0, 0, 0). Pixels outside the coordinate range are not processed. Contour detection is then performed on the processed image within the coordinate range, and the contour area Area is calculated. If the contour area Area is greater than the contour area threshold Minimum, the program will proceed accordingly. The area is considered to contain steel. The X-axis coordinate X10 of the largest pixel in the contour is taken. If X10 is less than Xmax, the calculation program is entered. If X10 is greater than Xmax, the analysis of the 10x camera (1B) is terminated, and the analysis of the image taken by the 11x camera (1C) is started. The same operation is performed as the image taken by the 10x camera (1B). The X-axis coordinate X11 of the largest pixel in the contour is taken. If X11 is less than Xmax, the calculation program is entered. If X11 is greater than Xmax, the analysis of the 11x camera (1C) is terminated, and the analysis of the image taken by the 12x camera (1D) is started. The same operation is performed as the image taken by the 10x camera (1B). The X-axis coordinate X12 of the largest pixel in the contour is taken and the calculation program is started. ④ The calculation program first sets the coordinate list C10, C11, C12 and the length list L10, L11, L12, calculates the length using interpolation and reads the billet weight data from the database (4), calculates the negative difference and makes a record report (5).

4. The method of using the H-beam cooling bed steel length measurement system according to claim 3, characterized in that: The length calculation formula in the step 4 is: In the formula, L is the calculated length of the profile steel, X is the maximum X-axis coordinate of the pixel points in the profile, C_min is the coordinate on the left side of X in the corresponding coordinate list, L_min is the length value corresponding to C_min in the length list, C_max is the coordinate on the right side of X in the corresponding coordinate list, and L_max is the length value corresponding to C_max in the length list.

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