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:
Nov. 02, 1999
Filed:
Nov. 06, 1996
Hideyuki Shimada, Tokyo, JP;
Kouei Kawamura, Yokohama, JP;
Noriaki Tanabiki, Kawasaki, JP;
Yuuzi Sano, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
The object of the present invention is to provide a video compression coding apparatus which, in the case where a code quantity variation allows a greater margin, can compress video data while suppressing any degradation of a video quality. First, input video data, after being transformed by a DCT section to a DCT coefficient, is quantized, by a quantizing section, with a quantization level designated with quantization control data. This quantized data is input to a variable length coding section where it is compression-coded in a block unit corresponding to a field or frame. A code quantity detecting section detects a code quantity of this coded data and delivers a result of detection to a quantization control section. The quantization control section has a given coding quantity-quantization level control characteristic representing a relation, to the quantization level, of the code quantity which obtains an average code quantity of initially input video data. The quantization control section determines a quantization level of the next block on the basis of the control characteristic and code quantity information from the code quantity detecting section and generates corresponding quantization control data.