Data control
Sync extraction
YUV
adjustment
VInR[5:0]ITUn[5:0]
VInG[5:2]
VInG[1:0]ITUn[7:6]
VInB[5:0]
VInSYNC1
VInSYNC2
VInCLK
YUV(4:2:2)
YUV(4:4:4)
YUV(4:4:4)
YUV(4:2:2)
YUV(4:4:4)
RGB(666)
RGB(888)
Scale
and
crop
Dithering
FIFO
YUV(4:4:4)
RGB(888)
RGB(666)
RGB(888)
RGB(888)
RGB(565)
VI0FFOINT
VI0AHEINT
VI0SCLINT
APB
AHB
AHB sla
ve
I/F
APB sla
ve
I/F
R
egist
ers
32 bit
32 bit
Figure 6-1 Video Input module block diagram
Video Input data
formats
The Video Input accepts following data formats:
•
RGB(666)/RGB(565) data with composite (CSYNC) or separate
(HSYNC and VSYNC) synchronization signal input
•
ITU-R656 conform YUV(4:2:2) data with synchronization via
embedded synchronization bytes
YUV adjustment
In case of ITU-R656 video input data the YUV(4:2:2) data is converted to YUV
(4:4:4) format and can then be adjusted in order to optimized brightness, contrast
and colour saturation. If monochrome images are captured, the colour can be
changed by replacing U and V by predefined values.
RGB(888) conversion
All further data video data processing is applied to 24-bit RGB(888) data, i.e. YUV
(4:4:4) and RGB(565)/RGB(666) is converted to RGB(888).
Scale and crop
The RGB(888) video data is passed to a scaling and cropping unit, that allows to
resize the image in x- and y-direction independently.
Dithering
In order to reduce visible luminance steps of 16-bit colour format RGB(565), that
is finally stored in the framebuffer, the dither unit adds some small random noise
to the internal 24-bit colour format RGB(888) before reducing to 16-bit output
format – effectively this hides the luminance steps to the human eye. The amount
of noise to add, thus the strength of the luminance steps covering, can be adjusted
by a register value.
The output data format of the dithering unit is 16-bit RGB(565).
Video Input (Ravin-M only)
Chapter 6
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