The images captured by a camera are composed of black and white grayscale pictures of 256 tones. Binarization defines all tones which are brighter than a certain threshold as white and the others as black. This technique is used to detect the existence or sizes of an object by categorizing the non-detecting and detecting areas into black and white respectively by binarization.
Edge detection
By setting the edge detection window, you can locate the section where the transition from white to black or black to white happens within the image and recognize it as an edge. This method is effective for detecting the absolute position of an edge.
Recognizes the pattern of an image
The target pattern is registered and stored in a pattern window. The pattern window then scans the specified search window to detect the position that best matches the registered image.