python opencv 讀取圖像

 

#!/usr/bin/env python
# coding=utf-8
import sys
import cv2
import numpy as np
np.set_printoptions(threshold=256*128*3);

#img = cv2.imread("-1_c1s1_000401_04.jpg")
img = cv2.imread("00000003_02_0002.jpeg")#BGRBGRBGR(row-major order)
if img is None:
    print("img not exists...")
    exit()
print(img.shape)
a = img[0,1,2]
print(type(a))
print(img[0,1,2])#row, col, channel; [0,1,2] the third channel(R), the firt row, the second column
print(img[0,0,:])#row, col, channel; [0,0,:] all channels(BGR), the firt row, the firt columns
print(img[1,:,0])#row, col, channel; [1,:,0] the first channel(B), the second row, all columns
print('channel_0: \n' + str(img[:,:,0]))#row, col, channel; [:,:,0] the first channel(B), all rows, all columns