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:
Mar. 09, 1999
Filed:
May. 30, 1996
Masatake Ohmori, Zama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A device encodes a multi-level image by coding bit planes obtained from the multi-level image. The device includes a gray-code-conversion unit converting the multi-level image into a gray-code representation, a bit-plane generating unit generating the bit planes from the gray-code representation, a data-reference unit extracting a current pixel and fixed reference pixels from a first one of the bit planes and extracting a floating reference pixel from a second one of the bit planes including the first one, and a coding unit coding a sequence of pixels extracted sequentially from the bit planes by using an entropy coding method. The entropy coding method uses as a coding parameter a probability of data occurrence of the current pixel, the probability of data occurrence being obtained based on the fixed reference pixels and the floating reference pixel.