초록 ▼

There is disclosed herein a system for expanding a compressed image stored in memory as one and two dimensional huffman codes into an image comprised of pixel data corresponding the orginal colors and positons of pixels in the original, uncompressed image. The system is comprised of a four stage, da

There is disclosed herein a system for expanding a compressed image stored in memory as one and two dimensional huffman codes into an image comprised of pixel data corresponding the orginal colors and positons of pixels in the original, uncompressed image. The system is comprised of a four stage, data driven pipeline where each stage works in parallel with the other stages. The first stage contends for read cycles to access the codes, stores the codes so accessed and converts the words of code bits so accessed into individual codes for application to the second stage. The second stage converts the incoming codes into their corresponding run lengths by looking each code up in a look up table. The table stores data which is either the run length itself for one dimensional codes or is data from which the run length may be calculated by reference to the previous raster line. The third stage converts the run lengths into strings of pixel data of the proper length and pixel color. The fourth stage converts these strings of pixels into words suitable for writing into a raster frame memory.

대표청구항 ▼

An apparatus for expanding a compression image stored as codes which define the original image pixel content comprising: first means for retrieving said codes; second means for decoding said codes into run length numbers which represent number of consecutive pixels of the same color including means

An apparatus for expanding a compression image stored as codes which define the original image pixel content comprising: first means for retrieving said codes; second means for decoding said codes into run length numbers which represent number of consecutive pixels of the same color including means for reading said codes from said first means in parallel format words which have boundaries which may or may not coincide with code boundaries and means for breaking said words at code boundaries and assembling complete codes including means for recognizing complete codes and for signalling the locations of each code\s boundaries; and third means for converting said run lengths into strings of pixel data corresponding to the strings of pixel data in the original image which were encoded into said codes which gave rise to said run length number including a raster frame memory and means for breaking said strings of pixel data into words and for writing these words into said raster frame memory.