Novel OpenGL Pixel Shader Dewarping
15 hours ago
- #Dewarping
- #PixelShader
- #OpenGL
- The author explored various methods for dewarping in camera streaming software, including CPU, vertex shader, and CUDA, each with significant drawbacks.
- A novel pixel shader dewarping technique was developed, leveraging a Sampler2D as a lookup table and OpenGL's sub-pixel accuracy for excellent aliasing.
- The solution uses GL_RGBA texture type to overcome the limitation of GL_UNSIGNED_BYTE, providing a sufficient range for pixel identification.
- The shader code provided demonstrates how each output pixel samples the LUT to find its corresponding location in the distorted source image.
- Performance is optimized by precalculating the lookup table and potentially integrating YUV conversion within the shader.
- An example C++ application showcasing this technique is available.