python opencv 处理文件、摄像头、图形化界面

转换成RGB

import cv2
import numpy as ny
img = ny.zeros( ( 3 , 3 ),ny.float32)
img=cv2.cvtColor(img,cv2.COLOR_BGR2RGB)
print(img)

 

将jpg装成png

import cv2
image=cv2.imread('C:/Users/Albert/PycharmProjects/CVTest/image/1.jpg')
cv2.imwrite('C:/Users/Albert/PycharmProjects/CVTest/image/1.png',image)

 

读入灰度图像

import cv2
image=cv2.imread('C:/Users/Albert/PycharmProjects/CVTest/image/1.jpg',cv2.IMREAD_GRAYSCALE)
cv2.imwrite('C:/Users/Albert/PycharmProjects/CVTest/image/11.png',image)

 

图像的相对路径是指python脚本所在的文件夹

 

B、G、R

将图像的绿色通道设置为0

import cv2 image=cv2.imread('C:/Users/Albert/PycharmProjects/CVTest/image/1.jpg') image[:,:,1]=0 cv2.imshow('a',image) cv2.waitKey(0)

 

 

图像基本属性

import cv2 image=cv2.imread('C:/Users/Albert/PycharmProjects/CVTest/image/1.jpg') print(image.shape) print(image.size) print(image.dtype)