示例代码
import cv2 import numpy as np from PIL import Image from matplotlib import pyplot as plt # 这两行代码使得 pyplot 画出的图形中可以显示中文 plt.rcParams['font.sans-serif'] = ['SimHei'] plt.rcParams['axes.unicode_minus'] = False pic_file = 'demo.jpeg' fig = plt.gcf() fig.set_size_inches(15, 5) plt.subplot(1, 2, 1) plt.imshow(Image.open(pic_file)) plt.axis('off') plt.title('原图') # 按R、G、B三个通道分别计算颜色直方图 img_bgr = cv2.imread(pic_file, cv2.IMREAD_COLOR) # OpenCV读取颜色顺序：BGR b_hist = cv2.calcHist([img_bgr], [0], None, [256], [0, 256]) g_hist = cv2.calcHist([img_bgr], [1], None, [256], [0, 256]) r_hist = cv2.calcHist([img_bgr], [2], None, [256], [0, 256]) # 显示3个通道的颜色直方图 plt.subplot(1, 2, 2) plt.plot(b_hist, label='B', color='blue') plt.plot(g_hist, label='G', color='green') plt.plot(r_hist, label='R', color='red') plt.legend(loc='best') plt.xlim([0, 256]) plt.show()点击复制复制失败已复制
效果：
