MT9M114_1 datasheet(21/45 Pages) ONSEMI

部件名	MT9M114

功能描述	High?륞efinition (HD) System?륮n?륾?륝hip (SOC) Digital Image Sensor

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制造商	ONSEMI [ON Semiconductor]

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MT9M114

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21

Digital Gain

Image stream processing starts with multiplication of all

pixel values by a programmable digital gain. Independent

color channel digital gain can be adjusted with registers.

Adaptive PGA (APGA)

Lenses tend to produce images whose brightness is

significantly attenuated near the edges. There are also other

factors causing fixed pattern signal gradients in images

captured by image sensors. The cumulative result of all these

factors is known as image shading. The MT9M114 has an

embedded shading correction module that can be

programmed to counter the shading effects on each

individual R, Gb, Gr, and B color signal.

In some cases, different illuminants can introduce

different color shading response. The APGA feature on the

MT9M114 will compensate for the dependency of the lens

shading of the illuminant. The MT9M114 will allow for up

to three different illuminants to be compensated.

Color Interpolation and Edge Detection

In the raw data stream fed by the sensor core to the IFP,

each pixel is represented by a 10-bit integer, which can be

considered proportional to the pixel’s response to

a one-color light stimulus, red, green, or blue, depending on

the pixel’s position under the color filter array. Initial data

processing steps, up to and including the defect correction,

preserve the one-color-per-pixel nature of the data stream,

but after the defect correction it must be converted to a

three-colors-per-pixel stream appropriate for standard color

processing. The conversion is done by an edge-sensitive

color interpolation module. The module adds the incomplete

color information available for each pixel with information

extracted from an appropriate set of neighboring pixels.

The algorithm used to select this set and extract the

information seeks the best compromise between preserving

edges and filtering out high-frequency noise in flat field

areas. The edge threshold can be set through variable

settings.

Color Correction and Aperture Correction

To achieve good color fidelity of the IFP output,

interpolated RGB values of all pixels are subjected to color

correction. The IFP multiplies each vector of three pixel

colors by a 3

× 3 color correction matrix. The three

components of the resulting color vector are all sums of three

10-bit numbers. Since such sums can have up to 12

significant bits, the bit width of the image data stream is

widened to 12 bits per color (36 bits per pixel). The color

correction matrix can either be programmed by the user or

automatically selected by the AWB algorithm implemented

in the IFP.

Traditionally this would have been based off two sets of

CCM, one for Warm light like Tungsten and the other for

Daylight (the part would interpolate between the two

matrixes). This is not an optimal solution for cameras used

in a Cool White Fluorescent (CWF) environment, for

example when using a webcam. A better solution is to

provide three CCMs, which would include a matrix for CWF

(interpolation now between three matrixes). The MT9M114

offers this feature which will give the user improved color

fidelity when under CWF type lighting.

Color correction should ideally produce output colors that

are independent of the spectral sensitivity and color

crosstalk characteristics of the image sensor. The optimal

values of the color correction matrix elements depend on

those sensor characteristics and on the spectrum of light

incident on the sensor. The color correction settings can be

adjusted using variables.

To increase image sharpness, a programmable 2D

aperture correction (sharpening filter) is applied. The gain

and threshold for 2D correction can be defined through

variable settings.

Gamma Correction

The gamma correction curve (as shown in Figure 22) is

implemented as a piecewise linear function with 19 knee

points, taking 12-bit arguments and mapping them to 8-bit

output. The abscissas of the knee points are fixed at 0, 64,

128, 256, 512, 768, 1024, 1280, 1536, 1792, 2048, 2304,

2560, 2816, 3072, 3328, 3584, 3840, and 4096. The 8-bit

ordinates are programmable through variables.

The MT9M114 IFP includes a block for gamma

correction that has the capability to adjust its shape, based on

brightness, to enhance the performance under certain

lighting conditions.

Two custom gamma correction tables may be uploaded,

one corresponding to a contrast curve for brighter lighting

conditions, the other one corresponding to a noise reduction

curve for lower lighting conditions. Also included in this

block is a Fade-to-Black curve which sets all knee points to

zero and causes the image to go black in extreme low light

conditions.

The MT9M114 has the ability to calculate the 19 point

knee points based on a small number of variable inputs from

the host, another option is for the host to program one or both

of the 19 knee points. The diagram below shows how the

gamma feature interacts in MT9M114.

类似零件编号 - MT9M114_1

制造商	部件名	数据表	功能描述
ON Semiconductor	MT9M114	2Mb / 62P	High-Definition (HD) System-On- A-Chip (SOC) Digital Image Sensor Rev. 11, 2/16 EN

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类似说明 - MT9M114_1

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