代码如下:
#API调用方式
import cv2
import numpy as np
def ImageHist(image,type):
color = (255,255,255)
windowName = 'Gray'
if type == 31:
color = (255,0,0)
windowName = 'B Hist'
elif type == 32:
color = (0,255,0)
windowName = 'G Hist'
elif type == 33:
color = (0,0,255)
windowName = 'R Hist'
#图片的数据 计算直方图通道(灰度) mask蒙版 直方图的柱状 像素值
hist = cv2.calcHist([image],[0],None,[256],[0.0,255.0])
#最大值最小值坐标及值
minV,maxV,minL,maxL = cv2.minMaxLoc(hist)
#创建画布
histImg = np.zeros([256,256,3],np.uint8)
for h in range(256):
intenNormal = int(hist[h]*256/maxV)
cv2.line(histImg,(h,256),(h,256-intenNormal),color)
cv2.imshow(windowName,histImg)
return histImg
img = cv2.imread('image1.jpg',1)
channels = cv2.split(img)#RGB图像分解
for i in range(0,3):
ImageHist(channels[i],31+i)
cv2.waitKey(0)
实现如图: