Bimetallic strip temperature measurement method based on OpenCV image edge identification

The invention provides a bimetallic strip temperature measurement method based on OpenCV image edge identification. The method comprises the following steps: extracting the edge of a metal sheet by adopting a Sobel operator; after the edge is extracted through Sobel operator operation, the edge of the image needs to be refined; in the edge refining process, taking an edge image obtained after the Sobel operator traverses for the first time as an input image; after edge coordinates are extracted, a contour is established on a pixel coordinate plane, calibration with an actual size is needed after a corresponding pixel coordinate set, an actual length corresponding to the pixel coordinates is determined, and conversion between a pixel measurement value and an actual measurement value is realized; software and hardware are combined, the recognition accuracy is high, test program codes can be repeatedly used in an open source, replacement compatibility of the bimetallic strip can be achieved, the defect that the