Datasheet

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MT9D111__6_REV5.fm - Rev. B 2/06 EN
115 ©2004 Micron Technology, Inc. All rights reserved.
MT9D111 - 1/3.2-Inch 2-Megapixel SOC Digital Image Sensor
Output Format and Timing
Micron Confidential and Proprietary
Color Conversion Formulas
Y'Cb'Cr' ITU-R BT.601
A widely known color conversion standard. Note that 16 < Y
601
< 235 and 16 < Cb, Cr <
240. 0 < = RGB < = 255.
Y
601
' = Y'*219/256 + 16
Cr' = 0.713 (R' - Y')*224/256 + 128
Cb' = 0.564 (B' - Y')*224/256 + 128
where Y' = 0.299 R' + 0.587 G' + 0.114 B'
The reverse formulas to convert YCbCr into RGB, 0 < = RGB < = 255:
R' = 1.164(Y
601
' - 16) + 1.596(Cr' - 128)
G' = 1.164(Y
601
' - 16) - 0.813(Cr' - 128) - 0.391(Cb' - 128)
B' = 1.164(Y
601
' - 16) + 2.018(Cb' - 128)
Y'U'V'
This conversion is BT 601 scaled to make YUV range from 0 through 255. This setting is
recommended for JPEG encoding and is the most popular, although it is not well defined
and often misused in Windows.
Y' = 0.299 R' + 0.587 G' + 0.114 B'
U' = 0.564 (B' - Y') + 128
V' = 0.713 (R' - Y') + 128
There is an option where 128 is not added to U'V'.
Y'Cb'Cr Using sRGB Formulas
The MT9D111 implements the sRGB standard. This option provides YCbCr coefficients
for a correct 4:2:2 transmission. Note that 16 < Y60 1< 235, 16 < Cb, Cr < 240 and 0 < =
RGB < = 255.
Y' = (0.2126*R' + 0.7152*G' + 0.0722*B')*219/256 + 16
Cb' = 0.5389*(B '- Y')*224/256 + 128
Cr' = 0.635*(R' - Y')*224/256 + 128
Y'U'V' Using sRGB Formulas
Similar to the previous set of formulas, but has YUV spanning a range of 0 through 255.
Y' = 0.2126*R' + 0.7152*G' + 0.0722*B'
U' = 0.5389*(B' - Y') + 128 = -0.1146*R - 0.3854*G + 0.5*B
V' = 0.635*(R' - Y') + 128 = 0.5*R - 0.4542*G - 0.0458*B
There is an option to disable adding 128 to U'V'. The reverse transform is as follows:
R' = Y + 1.5748*V
G' = Y - 0.1873*(U - 128) - 0.4681*(V - 128)
B' = Y + 1.8556*(U - 128)