Apparatus and method for detecting error in a digital image

The apparatus of 1, wherein the image compressor further comprises:

• a transform module configured to convert the digital image information from spatial to frequency domain, the transform module configured to generate transform coefficients;
• a quantization module coupled to the transform module, the quantization module configured to quantize the transform coefficients;
• and
• a variable length coding module coupled to the quantization module, the variable length coding module configured to compress the quantized transform coefficients and to generate the at least one error detection indicator.

An apparatus for compressing digital image comprising:

• transform means for converting digital image information from spatial to frequency domain and generating transform coefficients;
• means for quantizing the transform coefficients;
• variable length coding means for compressing the quantized transform coefficients;
• means for generating at least one error detection indicator for the compressed information;
• and
• means for adding the at least one error detection indicator in the compressed information.

An apparatus for decoding compressed information comprising:

• variable length decoding means for decompressing the compressed information into decompressed information;
• means for inverse quantizing the decompressed information;
• means for converting the inverse quantized decompressed information from frequency to spatial domain;
• and
• means for detecting errors in the decompressed information using at least one error detection indicator added to the compressed information.

A method for decoding compressed information comprising:

• variable length decoding the compressed information into decompressed information;
• detecting errors in the compressed information using at least one error detection indicator added to the decompressed information;
• inverse quantizing the decompressed information;
• and
• converting the inverse quantized decompressed information from frequency to spatial domain.