MT9M114_16 Datasheet, PDF (28/62 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
Figure 23: Gamma Interaction
C a m_ll_sta rt_co n tra s_tlu m a_p e rce n ta g e
C a m_ll_sto p_co n tra s_tlu m a_p e rce n ta g e
C a m_ll_sta r_t co n tra s_tg ra d ie n t
C a m_ll_m o d e[1:0]
C a m_ll_sto p_co n tra s_tg ra d ie n t
C a m_ll_g a m m a
C ontr ast
Enhancem ent
M T9M114calculates19 knee
point gam m a curves
19 knee point calculation
N oise R eduction
L l_g a m m_ase le ct
C ontr ast
Enhancem ent
G am m a c urv e s elec tion Noise Reduction
L l_e n a b le_fa d e_to_b la
ck
Fade to Black selection
C am_ll_star_t contras_tgradient
Final gamma curve
Gamma Knee Point Calculation
The MT9M114 allows for the 19 knee point curves to be programmed based off a small
number of variables. The table below shows the variables which are required.
Table 8: Variables Required for Gamma Knee Point Calculation
Variable
VAR(0x12,0x0124) or
(R0xC924)
VAR(0x12,0x013C) or
(R0xC93C)
VAR(0x12,0x013E) or
(R0xC93E)
VAR(0x12,0x0140) or
(R0xC940)
Name
cam_ll_llmode
cam_ll_start_contrast_bm
cam_ll_stop_contrast_bm
cam_ll_gamma
Function
0x00: User will program 19 knee point gamma curves
0x01: MT9M114 will calculate 19 knee point for contrast curve (first
curve or table).
0x02: MT9M114 will calculate 19 knee point for noise reduction
curve (second curve or table).
0x03: MT9M114 will calculate both 19 knee point curves.
Interpolation start point for first curve
Interpolation stop point for second curve
The value of the gamma curve, this is applied to both 19 knee point
curves. The default is 220, this equates to a gamma of 2.2.
MT9M114/D Rev. 11, 2/16 EN
28
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