Console/terminal demo of coordinate remapping with OpenCV, supporting Windows 11 and Ubuntu Linux 24.04, based on the OpenCV remap tutorial. cv2.remap takes a map that says, for every pixel of the output, which source coordinate to read from — so by writing a different map you get a different geometric transform, without changing the image data itself. Four mappings are demonstrated: a 2× zoom into the centre of the image, a vertical flip, a horizontal flip, and both flips at once (a 180-degree rotation). Two example images ship under data/ and the results are saved to model/remap/. No GPU is involved.

 

[Folder Structure]

  • CLAUDE.md / AGENT.md: program specification (identical content).
  • CHANGELOG.md: change log.
  • copyright.txt: copyright notice.
  • data/: the example images Lena.png (the notebook's example) and sample.png.
  • model/remap/: the results remap_zoom.png, remap_flip_v.png, remap_flip_h.png and remap_flip_both.png (ship with the Lena examples).
  • tool/tools.py: shared helpers.
  • src/: the demo, the launcher scripts and this document.
  • venv/: Python virtual environment, created by step 1.

[Prerequisites]

  • Operating system: Windows 11 or Ubuntu Linux 24.04.
  • Python 3 and pip.
  • Dependencies are listed in src/requirements.txt and installed by step 1.
  • No GPU required.

[Instructions]

Step 1: create the virtual environment

Delete the old venv/, create a fresh one and install src/requirements.txt. Aborts loudly if pip fails.

 

Windows 11: src\01_venv_create.bat

Ubuntu 24.04: bash src/01_venv_create.sh

 

Step 2: activate the virtual environment

Activate the venv you just created. On Linux, source it so the environment variables apply to the current shell.

 

Windows 11: src\02_venv_activate.bat

Ubuntu 24.04: source src/02_venv_activate.sh

 

Step 3: run the remap demo

Build each map, remap the image and save the results. Extra arguments are forwarded to the Python script.

 

Windows 11: src\03_remap.bat

Ubuntu 24.04: bash src/03_remap.sh

Your own image, or only some of the mappings:

bash src/03_remap.sh --source data/sample.png --modes zoom,flip_h

 

Step 4: clear the virtual environment (optional)

Delete the venv/ folder to free disk space when you no longer need it.

 

Windows 11: src\99_venv_clear.bat

Ubuntu 24.04: bash src/99_venv_clear.sh

 

[Python Entry Point]

  • src/remap.py: [--source IMG] [--modes zoom,flip_v,flip_h,flip_both] [--output-dir DIR] [--show].
  • --source: input image, default data/Lena.png.
  • --modes: which mappings to run, by default all four of the notebook's mappings.
  • --output-dir: output folder, default model/remap/. --show also opens the results in windows.
  • Saves one remap_{mode}.png per mapping.
  • In the zoom mapping everything outside the centre region maps to the source pixel (0, 0), so that output has a flat border. This matches the tutorial's behaviour and is not a bug.

[References]

 

This SDK is built in AppForAI - AI Dev Tools.

 

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