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. 23, 2004
Filed:
Oct. 05, 2001
Anthony Morel, Xi'an, CN;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A video bitrate control method for a video coding system, the coding system generating coded video frames to be stored in a storage device and originating from a sequence of input frames, the method comprising at least a quantization step for applying to the input frames a quantization factor issued from an evaluation step. The evaluation step uses statistics relative to previous coded frames to evaluate a complexity of the current frame to be coded. In parallel, a current bit target for the frame being coded is estimated in relation to the remaining space available in the storage device and the remaining number of frames to be coded in the sequence. Then the quantization factor is derived on the basis of the estimated complexity and the estimated current bit target. This results in an output bitrate for coded frames having CBR or VBR behaviors, leading to a constant quality of the coded video frames, while guaranteeing an optimal filling of the storage device.