python使用numpy实现直方图反向投影示例
最近跟着OpenCV2-Python-Tutorials在学习python_opencv中直方图的反向投影时,第一种方法是使用numpy实现将图中的红色玫瑰分割出来,教程给的代码缺了一句函数,导致实现不出来。
自己加上了后(也不知到这样加对不对)代码和效果如下:
代码: import cv2 import numpy as np roi = cv2.imread('./data/rose_red.jpg') hsv = cv2.cvtColor(roi,cv2.COLOR_BGR2HSV) #target is the image we search in target = cv2.imread('./data/rose.jpg') cv2.imshow('target',target) hsvt = cv2.cvtColor(target,cv2.COLOR_BGR2HSV) # Find the histograms using calcHist. Can be done with np.histogram2d also M = cv2.calcHist([hsv],[0, 1], None, [180, 256], [0, 180, 0, 256] ) print(M) I = cv2.calcHist([hsvt],[0, 1], None, [180, 256], [0, 180, 0, 256] ) h,s,v = cv2.split(hsvt) #斜体是自己加上的 R=M/I print(R.shape) B = R[h.ravel(),s.ravel()] print(B) B = np.minimum(B,1) print(B) B = B.reshape(hsvt.shape[:2]) disc = cv2.getStructuringElement(cv2.MORPH_ELLIPSE,(9,9)) B=cv2.filter2D(B,-1,disc) B = np.uint8(B) cv2.normalize(B,B,0,255,cv2.NORM_MINMAX) cv2.imshow('B',B) ret,thresh = cv2.threshold(B,2,255,0) cv2.imshow('thresh',thresh) res = cv2.bitwise_and(target,target,mask=thresh) cv2.imshow('res',res) cv2.waitKey(0)
效果:
rose_red.jpg
rose.jpg
result:
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