Saliency Detection Gradient Preservation for Bayer Image Color Reconstruction

  • TANG Chun-ming School of Artificial Intelligence Institute, Tianjin Polytechnic University, Tianjin, 300387, China
  • Hu Li-li School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin, 300387, China
Keywords: Bayer image, Color correction, Four-direction weights, Residual interpolation, Saliency detection.

Abstract

Image color reconstruction is a necessary process to recover high quality full color images from Bayer images. In view of the existence of image texture and edge blurring in color reconstruction algorithms, a four-direction joint gradient weighted residual interpolation algorithm is proposed, which uses four-direction weights obtained from RGB pixel gradients and residual gradients in Bayer images, linearly combined with the color difference estimation to effectively obtain the full G image. Aiming at the color cast phenomenon of the image after color interpolation, a saliency detection gradient-preserving color correction algorithm is proposed based on the RGB image captured under natural light. Firstly, the saliency detection method is used to segment the interpolated image and the RGB image into two regions, then carrying out the region correspondence for gradient-preserving color correction, and finally the weighted fusion method is used to obtain the final color reconstructed image. The experimental results show that the reconstructed image texture and edges are clearer and the colors are closer to RGB images.

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Published
2019-07-25
Section
Articles