我想通过处理前置摄像头视频来检测车辆的车道偏离 . 为此我想要水平选择每个帧的一个像素线并分析这些像素颜色的变化 . 为此,我想绘制R,G,B通道的直方图,其在x轴上从左到右具有像素数,在y轴上具有相应的像素值 . 由于我是这个领域的新手,我想知道如何使用opencv和python为视频中的每个帧绘制这个直方图?谢谢 .
这是图像的直方图(opencv matplotlib):
#!/usr/bin/python3 # 2017.12.20 14:00:12 CST # 2018.01.06 19:07:57 CST import matplotlib.pyplot as plt import numpy as np import cv2 img = cv2.imread("test.png") b,g,r = cv2.split(img) fig = plt.figure(figsize=(8,4)) ax = fig.add_subplot(121) ax.imshow(img[...,::-1]) ax = fig.add_subplot(122) for x, c in zip([b,g,r], ["b", "g", "r"]): xs = np.arange(256) ys = cv2.calcHist([x], [0], None, [256], [0,256]) ax.plot(xs, ys.ravel(), color=c) ax.set_xlabel('X') ax.set_ylabel('Y') plt.show()
以下是关于绘制3D直方图的两个示例,您可以参考 .
(1)How to plot 3D histogram of an image in OpenCV
(2)3d plot of list of (hist, bin_edges) where histogram bar chart or lines are in the z-y plane
1 回答
这是图像的直方图(opencv matplotlib):
以下是关于绘制3D直方图的两个示例,您可以参考 .
(1)How to plot 3D histogram of an image in OpenCV
(2)3d plot of list of (hist, bin_edges) where histogram bar chart or lines are in the z-y plane