RGB/YCrCb Conversion on 16-bit DSP

9794 19221 3752 16384 -13706 -2677 -5531 -10852 16384

32767 2 (22973) 0 32767 -23412 -11331 32767 0 2 (29015)

• Matrix multiplication (coefficients scaled by 215-1)

[Y Cr Cb]T = M [R G B]T

[R G B]T = M [Y Cr Cb]T

R = Y + 2 (22973 Cr)

B = Y + 2 (29015 Cb)

G = 2 (27929) Y - 6396 B - 18504 R

Y = 9794 R + 19221 G + 3752 B

Cr = 23369 (R - Y)

Cb = 18504 (B - Y)

• Move 8-bit color quantity to upper 8 of 16 bits

• Use 16 x 16 multiplication, 32-bit accumulation

• Nested formulas (coefficients scaled by 215-1)

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