Datasheet

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MT9D111__7_REV5.fm - Rev. B 2/06 EN
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MT9D111 - 1/3.2-Inch 2-Megapixel SOC Digital Image Sensor
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transitions. In addition, the slope of the "S" curve is zero at the top (white) and bottom
(black) points. The slope of the linear region determines how much contrast is applied;
more contrast corresponds to a higher, midtone linear slope.
Figure 36: Contrast “S” Curve
The contrast values are shown in Table 40.
The contrast curve function is applied to the gamma curve points used (whether the
gamma curve points are predefined or user-uploaded).
S-curve is a function to correct image pixel values. When applied to pixel values, it typi-
cally compresses dark and bright tones, while stretching the midtones. Figure 37 shows
how input tone range is remapped to output tone range. Suppose we categorize input
pixel values as dark, midlevel, and bright. When no S-curve is applied, pixel values are
unchanged. That is, dark tones 0..x
1
map to same dark tones 0..x
1
=y
1
, and midlevel maps
to identical midlevel x
1
=x
2
, and bright maps to identical bright. When an S-curve is
applied, the mapping is changed. In particular, midtones are stretched (y
1
-y
2
)>(x
1
-x
2
),
causing increase of contrast. Here (y
1
-y
2
)/(x
1
-x
2
) is a measure of contrast. Value of 1 cor-
responds to no change; >1 and <1 indicate contrast increase and decrease, respectively.
Dark tones are compressed, y
1
<x
1
, causing suppression of noise.
Table 40: Contrast Values
Contrast Setting Definition
0 No contrast correction
1 Contrast slope = 1.25
2 Contrast slope = 1.50
3 Contrast slope = 1.75
4 Noise reduction contrast