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Image Writing

Function method: cv2.imwrite('yahboom1.jpg', img).

The first parameter is the saved file name, the second parameter is the image to be saved.

Below we demonstrate the image writing method. First, read an image yahboom.jpg, then write yahboom1.jpg.

Code path:

~/dofbot_opencv/scripts/1.OpenCV_basic/02_write_pic.ipynb

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import cv2
# 1 file reading 2 format parsing 3 data decoding 4 data loading
img = cv2.imread('yahboom.jpg', 1)
# cv2.imshow('yahboom, img)  # see note below
cv2.imwrite('yahboom1.jpg', img) # 1 name 2 data

The cv2.imshow('yahboom, img) function cannot be executed in JupyterLab. If you need to use this line to display the read image, you need to execute the python file via command line: python3 XX.py

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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])

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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)

After the code block runs, you can see that yahboom.jpg has been written to yahboom1.jpg.