# encoding:utf-8
import cv2 as cv
from matplotlib import pyplot as plt
print("test opencv start")
image = cv.imread("C:\\Users\\scott\\Pictures\\test\\IMG_0401.JPG")
channels = cv.split(image)
colors = ('b', 'g', 'r')
hist = cv.calcHist([image], [0], None, [256], [0, 256])
plt.figure() # 新建一个图像
plt.title("RGB Histogram") # 图像的标题
plt.xlabel("Bins") # X轴标签
plt.ylabel("# of Pixels") # Y轴标签
for (channels, color) in zip(channels, colors):
hist = cv.calcHist([channels], [0], None, [256], [0, 256])
plt.plot(hist, color=color)
plt.xlim([0, 256])
plt.show() # 显示图像
cv.waitKey(0)
cv.destroyAllWindows()
print("test opencv end.")
图像素材：
素材
生成的直方图如下：
素材图片的彩色直方图
