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opencv/doc/tutorials/app/animations.markdown
Suleyman TURKMEN d9a139f9e8
Merge pull request #25608 from sturkmen72:animated_webp_support 
Animated WebP Support #25608

related issues #24855 #22569 

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake
2024-12-20 13:06:28 +03:00

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Handling Animated Image Files

@tableofcontents
Original author Suleyman Turkmen (with help of ChatGPT)
Compatibility OpenCV >= 4.11

Goal

In this tutorial, you will learn how to:

  • Use cv::imreadanimation to load frames from animated image files.
  • Understand the structure and parameters of the cv::Animation structure.
  • Display individual frames from an animation.
  • Use cv::imwriteanimation to write cv::Animation to a file.

Source Code

@add_toggle_cpp

  • Downloadable code: Click here

  • Code at a glance: @include samples/cpp/tutorial_code/imgcodecs/animations.cpp @end_toggle

@add_toggle_python

  • Downloadable code: Click here

  • Code at a glance: @include samples/python/tutorial_code/imgcodecs/animations.py @end_toggle

Explanation

Initializing the Animation Structure

Initialize a cv::Animation structure to hold the frames from the animated image file.

@add_toggle_cpp @snippet cpp/tutorial_code/imgcodecs/animations.cpp init_animation @end_toggle

@add_toggle_python @snippet python/tutorial_code/imgcodecs/animations.py init_animation @end_toggle

Loading Frames

Use cv::imreadanimation to load frames from the specified file. Here, we load all frames from an animated WebP image.

@add_toggle_cpp @snippet cpp/tutorial_code/imgcodecs/animations.cpp read_animation @end_toggle

@add_toggle_python @snippet python/tutorial_code/imgcodecs/animations.py read_animation @end_toggle

Displaying Frames

Each frame in the animation.frames vector can be displayed as a standalone image. This loop iterates through each frame, displaying it in a window with a short delay to simulate the animation.

@add_toggle_cpp @snippet cpp/tutorial_code/imgcodecs/animations.cpp show_animation @end_toggle

@add_toggle_python @snippet python/tutorial_code/imgcodecs/animations.py show_animation @end_toggle

Saving Animation

@add_toggle_cpp @snippet cpp/tutorial_code/imgcodecs/animations.cpp write_animation @end_toggle

@add_toggle_python @snippet python/tutorial_code/imgcodecs/animations.py write_animation @end_toggle

Summary

The cv::imreadanimation and cv::imwriteanimation functions make it easy to work with animated image files by loading frames into a cv::Animation structure, allowing frame-by-frame processing. With these functions, you can load, process, and save frames from animated image files like GIF, AVIF, APNG, and WebP.