03_OpenCV像素操作

import cv2

img = cv2.imread('libaray.JPG',1)
(b,g,r) = img[100,100]
print(b,g,r)# bgr
#10 100 --- 110 100
i=j=0
for j in range(1,500):
    img[i,j] = (255,255,255)
    for i in range(1,500):
        img[i,j] = (255,255,255)

# cv2.imshow('image',img)
# cv2.waitKey(0) #1000 ms

#bgr8转jpeg格式
import enum
import cv2

def bgr8_to_jpeg(value, quality=75):
    return bytes(cv2.imencode('.jpg', value)[1])

import ipywidgets.widgets as widgets

image_widget1 = widgets.Image(format='jpg', )
image_widget2 = widgets.Image(format='jpg', )
# create a horizontal box container to place the image widget next to eachother
image_container = widgets.HBox([image_widget1, image_widget2])

# display the container in this cell's output
display(image_container)

img1 = cv2.imread('libaray.JPG',1)

image_widget1.value = bgr8_to_jpeg(img1)  #原始的
image_widget2.value = bgr8_to_jpeg(img)   #经过像素操作的