ADLINK Technology HDV62, User Manual

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50 Function Library
5: 16bit YCbCr 4:2:2 (YUY2) – 8bit Y + 8bit Cb/Cr
6: 20bit YCbCr 4:2:2 – 10bit Y + 10bit Cb/Cr
‘x’ means ‘don’t care bit’.
Note: 1. Actual width of image setting in WriteCropping routine
needs to be multiple of 8 and actual height needs to
be an even number.
2. Total bytes of one scan line need to be aligned to mul-
tiple of 16. If the requirement is not met, HDV62 ap-
pends dummy bytes to the end of each line. For
example, if 20bit YCbCr 4:2:2 is selected and
width = 800 pixels, each line = 2144 bytes (11 dummy
bytes appended);
width = 640 pixles, each line = 1712 bytes (5 dummy
bytes appended);
width = 720 pixles, each line = 1920 bytes (0 dummy
bytes appended).
The formula is: total bytes of each line = ((width * 16 /
6) + 15) & ~15 with all integer calculation.
3. The formula of YCbCr to RGB is as following:
R = Y + 1.371(Cr-128)
G = Y – 0.698(Cr-128) – 0.336(Cb-128)
B = Y + 1.732(Cb-128)
DWORD
Pixel Data [31:0]
[31:24] [23:16] [15:8] [7:0]
dw0 Cr Y Cb Y
DWORD
Pixel Data [31:0]
[31:24] [23:16] [15:8] [7:0]
dw0
Cr0[1:0]+Y1[9:4] Y1[3:0]+Cb0[9:6] Cb0[5:0]+Y0[9:8] Y0[7:0]
dw1
xxxx+Cb2[9:6] Cb2[5:0]+Y2[9:8] Y2[7:0] Cr0[9:2]
dw2
Cb4[1:0]+Y4[9:4] Y4[3:0]+Cr2[9:6] Cr2[5:0]+Y3[9:8] Y3[7:0]
dw3
xxxx+Cr4[9:6] Cr4[5:0]+Y5[9:8] Y5[7:0] Cb4[9:2]