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. 15, 1998
Filed:
Oct. 20, 1995
Applicant:
Inventors:
Takeshi Kawano, Osaka, JP;
Takuya Sayama, Osaka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
345422 ;
Abstract
A depth buffer in a three-dimensional object displaying apparatus that stores compressed information on a Z value for each pixel. The Z value given to each pixel is compressed in accordance with a square root function or a logarithmic function. The compressed Z value is then stored in the depth buffer. In addition, the depth buffer is composed of a W-value buffer and a Z-value lookup table. The Z-value lookup table has entries of which one is designated by a W value such that a given Z value is stored therein, and the W-value buffer stores a W value for each pixel.