Pointer instrument degree identification method based on coordinate transformation

• Main Authors: HUANG HAIYE, GE HAIHUA
• Format: Patent
• Language: Chinese; English
• Published: 01.02.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; PHYSICS

The invention relates to a pointer type instrument degree identification method based on coordinate transformation, and the method comprises the following steps: acquiring an initial instrument image shot by a camera, obtaining a positioning instrument image by using a yolov4 algorithm, preprocessing the positioning instrument image, extracting an elliptic scale line arc of an instrument from the preprocessed image by using an edge detection algorithm, according to the obtained ellipse scale line arc, using ellipse fitting to obtain a fitting circle center of an instrument, establishing a dial coordinate system according to the fitting circle center, using an LSD straight line detection algorithm to detect a pointer, using an image shooting point as a circle center to establish a correction coordinate system, and obtaining a coordinate transformation matrix according to the correction coordinate system and the dial coordinate system; and obtaining a pointer instrument range value and a range included angle, a