How to obtain the width and height of an image in HALCON?

Conditions

• The image must already be loaded into a variable (e.g., using read_image).
• The operator get_image_size is called in the HDevelop environment.

Reasoning, step by step

1. Load an image into a variable, e.g., read_image (Image, 'printer_chip/printer_chip_01').
2. Call the get_image_size operator: get_image_size (Image, Width, Height).
3. Execute the code.
4. Check the control variables panel to see the assigned values for Width and Height.

Example

The code editor displays get_image_size (Image, Width, Height). After running, the variable panel shows Width with value 1600 and Height with value 1200.

Common misconceptions

• Assuming you need to manually calculate the dimensions from the image array.
• Forgetting to declare the output variables Width and Height before calling the operator.

Watch the explanation

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• What exactly is an operator in HALCON? How does it differ from a function?
• Why are operators said to have inputs and outputs just like functions?