Abstract: A method to detect (identify) wrongly decoded data (I type macro-blocks), which can be subsequently concealed by error concealment techniques, thereby improving the visual quality of a decoded stream, is provided. Additionally, a method is provided. In use, a set of macro-block data is selected for validation. Additionally, a set of suspicious macro blocks is selected from the set of macro-block data based on location information for each suspicious macro block.

Abstract: A method for concealing errors in compressed images in the JPEG 2000 format diosclosed. JPEG2000 (ISO/IEC 15444) is the new standard for image compression catering to different needs of various applications. This standard is much more advanced than JPEG and is rich in features. An Error concealment method in JPEG 2000 is provided which mainly deals with estimating the lost regions in a Wavelet Transformed image and works in Wavelet Transform Domain. This results in optimum error concealment and therefore, The method is applied before taking Inverse DWT.

Abstract: The video decoder may sometimes be required to decode erroneous data because of the error prone channel. In such cases due to random error patterns, decoder may misunderstand (‘wrongly decode’) the data, which may result in visibly annoying patterns in decoded output stream. The present invention provides a way to detect (identify) wrongly decoded data (I type macro-blocks), which can be subsequently concealed by error concealment means, improving the visual quality of decoded stream. The overall system consists of a detection means utilizing the quantization parameter associated with individual macro-blocks to carry out the detection, and selection means to selectively pass the decoded data to the detection means for detection. Selection means protects the correctly decoded data by reducing the candidates for detection means, which serves to improve complexity performance of the system as well.

Abstract: A method for concealing errors in compressed images in the JPEG 2000 format diosclosed. JPEG2000 (ISO/IEC 15444) is the new standard for image compression catering to different needs of various applications. This standard is much more advanced than JPEG and is rich in features. An Error concealment method in JPEG 2000 is provided which mainly deals with estimating the lost regions in a Wavelet Transformed image and works in Wavelet Transform Domain. This results in optimum error concealment and therefore, The method is applied before taking Inverse DWT.