如何使用opencv python将黑色更改为红色 [英] how to change the black color to Red with opencv python

问题描述

如何在python中制作它?我在这条线上遇到了问题

how can you make it in python? I faced a problem with this line

img_rgb.Set(mask,cv2.Scalar(0,0,255))

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)

推荐答案

mat.setTo()的API在python的Opencv模块中不可用，这是由于在C++中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，相反，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:

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:

img_rgb[mask == 255] = [0, 0, 255]

只需用img_rgb.Set(mask,cv2.Scalar(0,0,255))替换此行即可完成工作.

Simply replacing this line with the img_rgb.Set(mask,cv2.Scalar(0,0,255)) would get your work done.

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