Halcon shape_ trans

 read_image (Image, 'C:/Users/Administrator/Desktop/ Convexity .png')
rgb1_to_gray (Image, GrayImage)
binary_threshold (GrayImage, Region, 'max_separability', 'dark', UsedThreshold)# Fast binarization code with black and white background only

shape_trans (Region, RegionTrans, 'convex')

shape_trans (Region, RegionTrans, 'rectangle1')# The smallest circumscribed rectangle parallel to the coordinate axis

shape_trans (Region, RegionTrans, 'rectangle2')# Smallest circumscribed rectangle with angle