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)