W99681CF Datasheet, PDF (22/78 Pages) Winbond – JPEG USB Dual Mode Camera Chip

W99681CF
encoder. For the original video transfer, the CIF format from 240-line video can be produced by the
software driver.
7.1.5 Filtering
A 3-tap or 5-tap FIR filter is used to reduce noise and aliasing artifacts produced by the CCD or CMOS
sensor, and the scaling process.
7.1.6 Captured Video Data Format
After cropped, down-scaled, and filtered in the video pre-processing (VPRE) block, the input video is
stored into the DRAM as captured video. Four different formats are supported for the captured video:
YUV4:2:2 packed, YUV4:2:0 packed, YUV4:2:2 planar, and YUV4:2:0 planar modes, which are
selected by bits 1-0 of the Video Capture Control register (CR26) as described in Table 7.1. YUV4:2:2
and YUV4:2:0 packed modes are used for original video transfer, while YUV4:2:2 and YUV4:2:0 planar
modes are used for JPEG compression video transfer.
Table 7.1 Captured Video Data Format
CR26_1-0 Captured Video Data Format
00
YUV4:2:2 packed mode for original video transfer
01
YUV4:2:0 packed mode for original video transfer
10
YUV4:2:2 planar mode for JPEG compression video transfer
11
YUV4:2:0 planar mode for JPEG compression video transfer
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