Lossless compression of HDR color filter array image for the digital camera pipeline

This paper introduces a lossless color filter array (CFA) image compression scheme capable of handling high dynamic range (HDR) representation. The proposed pipeline consists of a series of pre-processing operations followed by a JPEG XR encoding module. A deinterleaving step separates the CFA image to sub-images of a single color channel, and each sub-image is processed by a proposed weighted template matching prediction. The utilized JPEG XR codec allows the compression of HDR data at low computational cost. Extensive experimentation is performed using sample test HDR images to validate performance and the proposed pipeline outperforms existing lossless CFA compression solutions in terms of compression efficiency. ⺠We introduce a lossless color filter array image compression scheme. ⺠It consists of a series of pre-processing operations and a JPEG XR encoding module. ⺠Proposed predictor exploits inter-channel and spatial correlation in input image. ⺠JPEG XR codec allows the efficient encoding of input in high dynamic range format. ⺠Proposed scheme delivers higher compression efficiency than prior art solutions.