Codeblock-based concealment scheme for JPEG2000 images in lossy packet networks

JPEG2000 compression standard considers a block of wavelet coefficients, called codeblock, as the smallest coding unit that being independently entropy-coded. In this paper, we propose a codeblock-based concealment technique for JPEG2000 images to mitigate missing codeblock due to packet loss in network transmission. The proposed method creates a single codestream from an image that composed of several subsampled versions of the original image. The technique then substitutes the lost codeblock in a subsampled image with a copy of the corresponding codeblock available in other subsampled images. Thus, it does not require an iterative processing, which is time consuming, to construct an estimated version of the lost data. The proposed method is applicable for a large codeblock size and can be implemented either in wavelet or codestream domain. Simulation results confirm the effectiveness of the proposed method.