python-opencv 图片的基本变换操作

import cv2 as cv
import numpy as np

img = cv.imread("./shangyi.jpg",cv.IMREAD_COLOR) #960*540 numpy.ndarray
#截取像素区域
print(img[1:,2:3,:])
print(img[1:][99:100,100:101])
print(img[100,100,1])
print(img[100][100][1])
#获取像素点
print(img.item(100,100,0))
#获取图像分辨率
print(img.shape) #(行,列,通道)
#获取图像大小(像素个数)
print(img.size)
#获取图片数据类型
print(img.dtype)

#缩放
small = cv.resize(img,(int(960/100