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build_configurations.md

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Build configurations

This doc details some build configurations possible.

Images codecs support

To add/remove image codecs support, the following modifications are done.

PNG

  • Remove -DWITH_PNG=OFF and add -DBUILD_PNG=ON and -DBUILD_ZLIB=ON from the cmake command

    • The lib opencv_imgcodecs.a build pass

The library is compiled in the 3rdparty/ folder. Copy this folder into the esp32 example project folder.

JPEG

  • Remove -DWITH_JPEG=OFF and add -DBUILD_JPEG=ON of the cmake command

    • Problem at compilation time. Doesn't support JPEG for now (TODO).

Additional OpenCV modules

In addition to the core, imgproc and imgcodecs modules, the following were also tested:

  • features2d: The cross-compilation didn't cause issues. The following functionalities were used:

    • AKAZE features detector/descriptor
    • Matching method

  • calib3d: The cross-compilation didn't cause issues. The following functionalities were used:

    • undistortPoints method
    • findHomography method
    • projectPoints method

    These methods use double precision operations. Because the ESP32 only have a single precision Floating Point Unit (FPU), the operations are very slow. (TODO: have modified the methods to use only float, but must now add them to this repo).

Parallel support

TODO