MT9M114_16 Datasheet, PDF(29/62 Page) ON Semiconductor – High-Definition (HD) System-On- A-Chip (SOC) Digital Image Sensor

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MT9M114_16 Datasheet, PDF (29/62 Pages) ON Semiconductor – High-Definition (HD) System-On- A-Chip (SOC) Digital Image Sensor

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MT9M114: 1/6-Inch 720p High-Definition (HD) System-On-A-Chip (SOC) Dig-

ital Image Sensor

Table 8: Variables Required for Gamma Knee Point Calculation

Variable

VAR(0x12,0x0142) or

(R0xC942)

VAR(0x12,0x0143) or

(R0xC943)

VAR(0x12,0x0144) or

(R0xC944)

VAR(0x12,0x0145) or

(R0xC945)

VAR(0x12,0x0156) or

(R0xC956)

Name

Function

cam_ll_start_contrast_gradient The value of the contrast gradient which would be used for the first

curve

cam_ll_stop_contrast_gradient The value of the contrast gradient which would be used for the

second curve

cam_ll_start_contrast_luma_p The percentage of target luma for the inflexion point in the first

ercentage

curve

cam_ll_start_contrast_luma_p

ercentage

The percentage of target luma for the inflexion point second curve

cam_ll_inv_brightness_metric Measure of scene brightness, reference points for

cam_ll_start_contrast_bm and cam_ll_stop_contrast_bm

The concept of how the variables cam_ll_XX_contrast_gradient and cam_ll_XX_con-

trast_luma_percentage interact to produce a curve is shown below.

Figure 24: Automatic Gamma Curve

256

Target_luma

Inflexion point

MT9M114/D Rev. 11, 2/16 EN

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