Error concealment of damaged LL sub-band in motion JPEG 2000

Wavelet transform (WT), which is used in Motion JPEG 2000 for image transform, concentrates most of the energy of transformed image in LL sub-band. Hence, transmission error in LL sub-band of motion JPEG 2000 stream deteriorates the quality of the transmitted images to a grate extent. In this paper, a novel error concealment (EC) method is introduced for damaged LL sub-band of Motion JPEG 2000 image sequences. In the first step of this method, inverse wavelet transform is applied to LH, HL and HH (high frequency) sub-bands (HF-IWT). In the second step the motion estimation techniques are applied to the HF-IWT images of the damaged frame and the previous frame. The resulted motion vectors are used for determining the best matching point from the LL subband of previous correct frame for the points in the damaged LL sub-band. The matching point for any damaged point is accepted for EC if it satisfies the constraints which are set by the received value for the damaged point and number of lost bit planes. The proposed method outperforms the previous inter and intra mode EC methods for any number of lost bit planes in LL sub-band