Comparison of color transforms
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Mihai Cartoaje
Jun 17, 2009, 10:08:21 AM6/17/09
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This is a comparison of color transforms. All the color transforms
were tested at a bitrate of 1:100. The luma channel is between 0 and
1. The chroma channels are approximately between -1 and 1. For
example, in the YCoCg transform the Y channel has half the norm of the
Cg channel. So with a quantization of 2:1:1 both the Y and Cg channels
would have the same norm. These are the images:
were tested at a bitrate of 1:100. The luma channel is between 0 and
1. The chroma channels are approximately between -1 and 1. For
example, in the YCoCg transform the Y channel has half the norm of the
Cg channel. So with a quantization of 2:1:1 both the Y and Cg channels
would have the same norm. These are the images:
Original of the Majandra image
YCoCg 4:1:2
YUV 4:1:1
YUV 8:1:1
YCbCr 4:1:1
YCbCr 8:1:1
Lossless YIQ 4:1:1 with a rotation of 45 degrees
Lossless YIQ 8:2:1 with a rotation of 45 degrees
Lossless YIQ 8:2:1 with a rotation of 33 degrees and I and Q having
the same norm
The ratios are the quantization factors.
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