[英]how to change the black color to Red with opencv python
how can you make it in python? 如何在python中制作? I faced a problem with this line 我在这条线上遇到了问题
img_rgb.Set(mask,cv2.Scalar(0,0,255))
and here is the code : 这是代码:
import numpy as np
import imutils
import cv2
img_rgb = cv2.imread('figi.jpg')
Conv_hsv_Gray = cv2.cvtColor(img_rgb, cv2.COLOR_BGR2GRAY)
ret, mask = cv2.threshold(Conv_hsv_Gray, 0, 255,cv2.THRESH_BINARY_INV |cv2.THRESH_OTSU)
img_rgb.Set(mask,cv2.Scalar(0,0,255))
cv2.imshow("imgOriginal", img_rgb) # show windows
cv2.imshow("output", res) # show windows
cv2.imshow("mask", mask) # show windows
cv2.waitKey(0)
The API for mat.setTo()
is not available in Opencv module for python, this is due to the reason that in C++
Opencv uses cv::Mat
object as basic entity for image manipulation, However in Python there is no such cv::Mat
concept, instead Python API for Opencv uses the well known library numpy
for image manipulation operations, and numpy has a very beautiful syntax to set the values using a mask: 用于mat.setTo()
的API在mat.setTo()
模块中不可用,这是由于以下原因:在C++
Opencv使用cv::Mat
对象作为图像处理的基本实体,但是在Python中没有这样的cv::Mat
概念,而不是Opencv的Python API使用众所周知的库numpy
进行图像处理操作,并且numpy具有非常漂亮的语法,可以使用掩码设置值:
img_rgb[mask == 255] = [0, 0, 255]
Simply replacing this line with the img_rgb.Set(mask,cv2.Scalar(0,0,255))
would get your work done. 只需用img_rgb.Set(mask,cv2.Scalar(0,0,255))
替换此行img_rgb.Set(mask,cv2.Scalar(0,0,255))
完成工作。
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