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Abstract

A run-length based decoder for decoding compressed image data while allowing error to be contained with the length of a code word. The decoder includes: (a) a shifter for outputing Q+1 number of N-bit data streams; (b) Q+1 code comparators to respectively receive the data streams from the shifter; (c) a code type arbitrator which includes a multiplexer to receive output signals from the Q+1 number of code comparators, and output the data stream received from the code word comparator which also outputs the verification signal; (d) a shift number generator connected to the code arbitrator to receive the N-bit data stream from the code arbitrator and generate a new_shift_number to the shifter according to the number of bits associated with the code word pattern of the N-bit data stream; and (e) a code interpreter which is also connected to the code arbitrator to receive to decode the N-bit data stream into pixels. The Q+1 number of comparators include (i) a comparator which does not make any assumption of the data stream, and (ii) Q number of comparators each assuming a respective code word pattern for the data stream and compares it with a predetermined code word table to see whether the data stream conforms to the assumed code word pattern. If yes, then the comparator outputs a verification signal along with the data stream which has been reset to conform to the assumed code word pattern.

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