Public Version
Camera ISP Functional Description
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6.4.6.1.4 Camera ISP CCDC DMA
The CCDC module is a master. It has its own address generator and sends addresses and data to the
central-resource shared-buffer logic. The central-resource shared-buffer logic arbitrates the data requests
and generates the bursts to memory.
6.4.6.1.5 Camera ISP CCDC Memories
The CCDC module has one memory:
•
REFORMATTER BUFFER: 3 x 1376 x 40 bits
•
LSC PREFETCH BUFFER: 1536 x 32 bits
6.4.7 Camera ISP Video-Processing Back End
The video-processing back end (VPBE) comprises the preview and Resizer modules.
6.4.7.1
Camera ISP VPBE Preview Engine Features
The preview module is responsible for transforming data from a RAW image sensor into YUV422 data that
is amenable to still-image encoding, video encoding, or display. It supports the following features:
•
Flexible input: Module input data can come from the RAW image sensor (10 bits) or from memory (8 or
10 bits).
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Flexible input formats: Bayer RGB color filter array, complementary-color filter array, Super CCD
Honeycom® sensors
•
Horizontal averaging by a factor of 1, 2, 4, or 8 in the horizontal direction. The preview module can
output a maximum of only 4096 pixels horizontally due to fixed memory-line sizes.
•
A-Law decompression: Transforms nonlinear 8-bit data to 10-bit linear data. The CCDC module can
perform A-Law compression.
•
Noise reduction and faulty-pixel correction:
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Dark-frame capture and subtraction
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Horizontal median filter
–
Programmable noise filter: 3x3 kernel of same color pixels
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Couplet faulty-pixel correction
•
Digital gain and white balance
•
Programmable CFA interpolation that operates on a 5x5 grid
•
Programmable RGB-to-RGB blending matrix: 9 coefficients for the 3x3 matrix
•
Programmable gamma correction: 1024 entries for each color held in local memory
•
Programmable RGB-to-YUV color conversion: 9 coefficients for the 3x3 matrix
•
Luminance enhancement (nonlinear), chrominance suppression and offset
6.4.7.1.1 Camera ISP VPBE Preview Block Diagram
shows the preview engine block diagram.
1206
Camera Image Signal Processor
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
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Страница 3054: ...3054 Multichannel SPI SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
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