MT9M114_16 Datasheet, PDF (39/62 Pages) ON Semiconductor – High-Definition (HD) System-On- A-Chip (SOC) Digital Image Sensor

MT9M114: 1/6-Inch 720p High-Definition (HD) System-On-A-Chip (SOC) Dig-
ital Image Sensor
Output Conversion and Formatting
The YUV data stream can either exit the color pipeline as is or be converted before exit to
an alternative YUV or RGB data format.
Color Conversion Formulas
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 various operating systems.
Y= 0.299  R + 0.587  G + 0.114  B
(EQ 1)
U= 0.564  (B – Y  + 128
(EQ 2)
V= 0.713  (R – Y  + 128
(EQ 3)
There is an option where 128 is not added to U'V'.
Y'Cb'Cr' Using sRGB Formulas
The MT9M114 implements the sRGB standard. This option provides YCbCr coefficients
for a correct 4:2:2 transmission.
Note: 16 < Y601< 235; 16 < Cb < 240; 16 < Cr < 240; and 0 < = RGB < = 255
Y= (0.2126  R + 0.7152  G + 0.0722  B   (219  256) + 16
(EQ 4)
Cb= 0.5389  (B – Y   (224  256) + 128
(EQ 5)
Cr= 0.635  (R – Y   (224  256) + 128
(EQ 6)
Y'U'V' Using sRGB Formulas
These are similar to the previous set of formulas, but have YUV spanning a range of 0
through 255.
Y= 0.2126  R + 0.7152  G + 0.0722  B
(EQ 7)
U= 0.5389  (B – Y) + 128 = – 0.1146  R – 0.3854  G + 0.5  B
(EQ 8)
V= 0.635  (R – Y  + 128 = 0.5  R – 0.4542  G – 0.0458  B
(EQ 9)
There is an option to disable adding 128 to U'V'. The reverse transform is as follows:
R= Y + 1.5748  V – 128
G= Y – 0.1873  (U – 128  – 0.4681  (V – 128)
B= Y + 1.8556  (U – 128)
(EQ 10)
(EQ 11)
(EQ 12)
MT9M114/D Rev. 11, 2/16 EN
39
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