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參數資料
型號: W9961CF
廠商: WINBOND ELECTRONICS CORP
元件分類: 消費家電
英文描述: H.263/H.261 Video Codec
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP208
封裝: 28 X 28 MM, 2.60 MM HEIGHT, PLASTIC, QFP-208
文件頁數: 27/65頁
文件大小: 344K
代理商: W9961CF
W9961CF
- 27 -
7 FUNCTIONAL DESCRIPTION
7.1 VPRE Processor
Cropping
FT
scaling
Down-
FIFO
Capture
FIFO
VPRE-in
Up-
scaling
Pre-filter
FIFO
VPRE-out
VICLK
UV[7:0]
HS, VS
Video Memory
Y[7:0],
for Display
for Encoding
YCbCr 4:2:2
YCbCr 4:2:0
Local View
Local View
Figure 7.1 VPRE Processor Block Diagram
The VPRE processor generates two video streams from the input video: the local view video for
display and the local view video for encoding.
The input video is cropped, down-scaled, and stored into the video memory as the local view video
for display that is real-time at 30 fps. Built-in cropping window control and arbitrary down-scaling in
both the horizontal and vertical directions can serve as the digital pan and zoom over a user-specified
region for camera control.
The local view video for encoding is generated from the local view video for display through the pre-
filter and/or up-scaling. Up-scaling is needed to vertically up-scale a 240-line video to a 288-line video
when encoding in CIF format by using an NTSC camera. Pre-filter is an adaptive 3
×
3 low-pass filter
which can detect noise induced from the video input device and remove it. Since H.263/H.261 uses
motion estimation and DCT for compression, the coding efficiency can be improved significantly by
using the pre-filtered video whose most noise is removed.
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相關代理商/技術參數
參數描述
W9966CF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
W9966TF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
W99681CF 制造商:WINBOND 制造商全稱:Winbond 功能描述:JPEG USB Dual Mode Camera Chip
W99685 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
W99685BS 制造商:WINBOND 制造商全稱:Winbond 功能描述:SYSTEM CAMERA DEVICE