AnsweredAssumed Answered

Vybird, RGB888 input, RGB888 output, no quality lost???

Question asked by Alfred LIU Employee on Mar 12, 2014
Latest reply on Mar 17, 2014 by Alfred LIU

Hi, Vybrid expert:


the actual limitaion is ITU decoder, which can only output YUV422 or YUV444 (actually from YUV422). 

so even we can input RGB888 and output RGB888, the quality will lost. right?


do we have anyway to do this without quality lost?


here is the information in our datasheet:

57.5.3 Decoder

The ITU Decoder block (2) detects the ITU656 timing reference signal (consists of a

four-word sequence in the following format: FF-00-00-XY) and extracts HSYNC,

VSYNC, field number signals and video data from the ITU data stream. The format of

active pixel data from the ITU stream is YUV 4:2:2. The decoder block can directly send

out this YUV 4:2:2 data, or interpolate it to YUV 4:4:4 format and send it out. This is

determined by the MODE444 field in the SCR register. This bit shall be set if the downscaler

is enabled, because the down-scaler works on YUV 4:4:4 data format.