TMS320DM355 datasheet(117/153 Pages) TI

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TMS320DM355

Digital Media System-on-Chip (DMSoC)

SPRS463 – SEPTEMBER 2007

5.9.1.3.1 CFALD – CFA Multiply Mask / Lens Distortion Module

This hardware module, CFALD, contains two functions: lens distortion correction and CFA multiply mask.

The two functions share hardware components so only one can operate at a time. Lens geometric

distortion, or barrel distortion, refers to the warping of image contents typically at the corners of a captured

image. This is a common problem in digital photography, so being able to correct the distortion in

hardware enhances the value and competitiveness of a digital camera DSP device. The CFA multiply

mask function takes a down-sampled multiplication mask from external memory, and up-samples it to pixel

resolution to scale the corresponding pixels of a CFA image. CFA multiply mask is useful for lens shading

compensation and scene-dependent lighting adjustment. .

• Lens distortion correction:

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Correct barrel distortion

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Radius-to-magnification-factor table to accommodate various distortion functions via programming

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Configurable center point and horizontal/vertical adjustment

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Separate lookup table for each color to correct chromatic aberration

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Support CFA data format input/output for pre-image-pipe correction

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Support up to 14-bit data input/output

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Support up to 16383 x 16383 image dimension

• CFA multiply mask:

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Multiply mask in 8x8 down-sampled format

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Support 8-bit mask (in U8Q5 format)

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Support up to 14-bit image data input/output

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Support up to 16383 x 16383 image dimension

5.9.1.3.2 Auto Exposure (AE) and Auto White Balance (AWB) Engine

The following features are supported by the Auto Exposure (AE) and Auto White Balance (AWB) Engine.

• Accumulate clipped pixels along with all non-saturated pixels.

• Up to 36 horizontal windows.

• Up to 128 vertical windows.

• Programmable width and height for the windows. All windows in the frame will be of same size.

• Separate vertical start coordinate and height for a black row of paxels that is different than the

remaining color paxels.

• Programmable Horizontal Sampling Points in a window.

• Programmable Vertical Sampling Points in a window.

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