Image quality processing of a compressed image
AssigneeXerox Corporation
InventorRobert R. Buckley
Life of this patent
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Abstract
An imaging apparatus receives a stream of image data compressed according to a token based compression algorithm. The token dictionary is decompressed and processed according to desired standards such as optimizing for a particular image output device. After revision, the revised tokens are stored in a revised dictionary which is accessed upon decompression of image content. When the image content is decompressed the locations in the compressed or coded input data stream refer to locations in the revised dictionary which are extracted and output either to hard copy or for further processing.
Claims17
A method of processing compressed digital image data comprising:
- receiving the digital image data compressed according to a defined pattern matching technique, where the digital image data includes coded image content data and a decoding pattern dictionary containing one or more image patterns substitutable for the coded image content data;
- and
- revising at least one of the one or more image patterns already in the decoding pattern dictionary.
In an image processing system which receives image data compressed by a pattern matching process, a method of decompressing the image data comprising in optional sequence:
- adjusting an output appearance of at least one pattern in a database of stored post-compression patterns, the adjusting responsive to characteristics of a desired output mechanism;
- receiving an input pattern location corresponding to a post-compression pattern in the database;
- and
- extracting the adjusted post-compression pattern from the database.
A method of manipulating a data stream representation of an image which has been compressed, said method comprising:
- receiving the data stream including a dictionary and a coded portion, said dictionary including one or more separate identifiable patterns in the image and said coded portion referencing the identifiable patterns in the dictionary;
- image processing a particular pattern in the dictionary;
- and
- replacing the particular pattern in the dictionary with the image processed version of that particular pattern.
In a xerographic image processing device, a method of manipulating a data stream representation of an image, said method comprising:
- receiving the data stream including an output pattern dictionary and a coded portion referencing identifiable patterns in the output pattern dictionary;
- image processing a pattern in the output pattern dictionary;
- replacing the pattern in the output pattern dictionary with the image processed pattern;
- repeating the image processing and replacing steps for all patterns in the output pattern dictionary;
- and
- storing the image processed output dictionary on a print server.
Dependencies are inferred from the claim text.