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3. OpenCV image writing

3.1 Function method: cv2.imwrite('new_img_name', img)

Parameter meaning:

The first parameter is the saved file name

The second parameter is the saved image

3.2. Actual effect display

Code path:

/home/pi/project_demo/06.Open_source_cv_fundamentals_course/A.introduction/Introduction_to_OpenCV/03_OpenCV_Img_Write.ipynb

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import cv2

# 1 File reading 2 Package format analysis 3 Data decoding 4 Data loading
img = cv2.imread('yahboom.jpg', 1)
# cv2.imshow('image', img) #This section needs to be executed in the Raspberry Pi graphical interface command line, and an image window will be displayed
cv2.imwrite('yahboom1.jpg', img) # 1 name 2 data

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#bgr8 to jpeg format
import enum
import cv2

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

​x
import ipywidgets.widgets as widgets

image_widget = widgets.Image(format='jpg', width=320, height=240)
display(image_widget)
img = cv2.imread('yahboom1.jpg',1)
image_widget.value = bgr8_to_jpeg(img) ``` ![](o3.png)