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Prior to encoding RGB full-color images or Bayer color filter array (CFA)images, chroma subsampling is a necessary and crucial step at the server side.In this paper, we first propose a flow diagram approach to analyze thecoordinate-inconsistency (CI) problem and the upsampling process-inconsistency(UPI) problem existing in the traditional and state-of-the-art chromasubsampling methods under the current coding environment. In addition, weexplain why the two problems degrade the quality of the reconstructed images.Next, we propose a reduced codebook and re-interpolation (RCRI) approach tosolve the two problems for enhancing the quality of the reconstructed images.Based on the testing RGB full-color images and Bayer CFA images, thecomprehensive experimental results demonstrated at least 1.4 dB and 2.4 dBquality improvement effects, respectively, of our RCRI approach against the CIand UPI problems for the traditional and state-of-the-art chroma subsamplingmethods.

A Reduced Codebook and Re-Interpolation Approach for Enhancing Quality in Chroma Subsampling