Cannot identify image file '/tmp/image.png'-CodePudding

I am working on training an object detection model on Google Colab based on 1. After training the model, I want to test the model on new image as in this Test the TFLite model on your image. I am obtaining an error when running the code in Run object detection and show the detection results:

INPUT_IMAGE_URL = "https://storage.googleapis.com/cloud-ml-data/img/openimage/3/2520/3916261642_0a504acd60_o.jpg"
DETECTION_THRESHOLD = 0.3

TEMP_FILE = '/tmp/image.png'
!wget -q -O $TEMP_FILE $INPUT_IMAGE_URL
im = Image.open(TEMP_FILE)
im.thumbnail((512, 512), Image.ANTIALIAS)
im.save(TEMP_FILE, 'PNG')

# Load the TFLite model
interpreter = tf.lite.Interpreter(model_path=model_path)
interpreter.allocate_tensors()

# Run inference and draw detection result on the local copy of the original file
detection_result_image = run_odt_and_draw_results(
    TEMP_FILE,
    interpreter,
    threshold=DETECTION_THRESHOLD
)

# Show the detection result
Image.fromarray(detection_result_image)

Can someone please explain to me what is the following code part used for :

TEMP_FILE = '/tmp/image.png'

!wget -q -O $TEMP_FILE $INPUT_IMAGE_URL
im = Image.open(TEMP_FILE)
im.thumbnail((512, 512), Image.ANTIALIAS)
im.save(TEMP_FILE, 'PNG')

Thank you in advance!

CodePudding user response：

# define local path to save image
TEMP_FILE = '/tmp/image.png'

# In a notebook, run bash command to download image locally from URL
!wget -q -O $TEMP_FILE $INPUT_IMAGE_URL

# Open the image (with Pillow library most likely)
im = Image.open(TEMP_FILE)

# Resize it to 512*512 pixels with the antialiasing resampling algorithm 
im.thumbnail((512, 512), Image.ANTIALIAS)

# Save output image to local file
im.save(TEMP_FILE, 'PNG')