Video signal decoding apparatus

A video signal decoding and encoding apparatus for decoding a coded bit stream of video signals which comprises blocks of quantized coefficient data and which is produced by encoding an input video signal using an encoding apparatus, wherein;

• said encoding apparatus comprises:
• a partitioning means for partitioning each frame of the input video signal into smaller blocks of pixel data;
• a transform coding means for transforming the partitioned blocks of pixel data into blocks of transformed coefficient data;
• a quantization means for quantizing the transformed coefficients data to produce quantized coefficient data;
• and
• a variable-length and run-length coding means for variable-length and run-length coding the quantized coefficient data to produce the coded bit stream;
• said decoding apparatus comprises:
• a variable-length and run-length decoding means for variable-length and run-length decoding the coded bit stream to reconstruct the blocks of quantized coefficient data;
• an inverse quantization means for inverse quantizing the reconstructed blocks of quantized coefficient data;
• an inverse coding means for ›transforming! exclusively applying inverse DCT to the inverse quantized blocks of quantized coefficient data to produce decoded blocks which comprise both edge blocks and non-edge blocks;
• an edge block detection means for determining whether each of the decoded blocks is an edge block;
• and
• an adaptive edge enhancement filter means for removing distortions from individual decoded blocks when said edge block detection means determines that a respective decoded block is an edge block.