get image

    You can get images from the camera, you can read picture files from the file system, or you can get pictures from the network

    Get from camera

    This part has been mentioned in the previous tutorial

    import sensor, lcd
    
    sensor.reset()
    sensor.set_pixformat(sensor.RGB565)
    sensor.set_framesize(sensor.QVGA)
    sensor.run(1)
    sensor.skip_frames()
    
    img = sensor.snapshot()
    print(img)
    
    • import sensor: first import the built-in sensor (camera) library
    • sensor.reset(): Initialize the camera. If it fails, check the hardware
    • sensor.set_pixformat(sensor.RGB565): Set the camera to RGB565 format, the default is to use RGB565
    • sensor.set_framesize(sensor.QVGA): The resolution is QVGA, that is, 320x240
    • sensor.run(1): start to run, it is not necessary to call it in the current version, the camera will automatically start to run after the above settings are completed
    • sensor.skip_frames(): The image quality is not stable when the camera is just started, so some images are skipped
    • sensor.snapshot(): fetch a frame of image data from the camera, the return value is an image object

    In addition to the above functions, you may also need to set the image to mirror (hmirror), such as the front camera; or flip up and down (vflip), and white balance, etc., see sensor module API manual

    Read from file

    import image
    
    img = image.Image("/sd/test.jpg")
    print(img)
    

    Of course you can also save the picture to the file system`

    img.save("/sd/test2.jpg", quality=95)
    

    Read from memory (or read from network)

    You can read the file to the memory first, depending on your application where you read it from, such as network, or serial port SPI, etc.
    Construct a bytes object

    import image
    
    jpeg_buff = b'\xFF' # jpeg buffer
    img = image.Image(jpeg_buff, from_bytes = True)
    print(img)
    

    Create a blank image directly

    import image
    
    img = image.Image(size=(320, 240))
    

    This picture is a black blank image