The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 14, 1999
Filed:
Oct. 16, 1996
Toshiyuki Hattori, Nagano, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A CPU converts data received from a host device into binary image data and compresses the data, and thereafter writes the compressed data into an image buffer in a RAM. In this compression, a method is employed in which, in a manner similar to the Huffman code compression method, an attention-directed byte is compressed on the basis of a correlation between the byte and a preceding byte. The compressed image data are DMA-transferred to a reconstruction/smoothing circuit. The reconstruction/smoothing circuit is configured by adding logic circuits for reconstruction to a smoothing circuit known in the conventional device, and reconstructs the compressed data by using a circuit which is in the smoothing circuit and which holds a preceding byte, or by referencing the held preceding byte.