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Camera ISP Functional Description
–
Memory: Enables differed processing
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Memory: CCDC module: Enables on-the-fly processing
•
Flexible input format:
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YUV422 packed data (16 bits)
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Color-separate data (8 bits). The data must be contiguous in memory. The input source for the data
must be the memory: not available for on-the-fly processing.
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Same output format as input
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Upsampling: Up to 4. Enables digital zoom:
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General polyphase filter:
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Ratio of 1 to 4: 4 taps (horizontal and vertical) and 8 phases
•
Downsampling: Down to 0.25:
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General polyphase filter:
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Ratio of 0.25 to 0.5: 7 taps (horizontal and vertical) and 4 phases
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Ratio of 0.5 to 1: 4 taps (horizontal and vertical) and 8 phases
•
Constraints:
–
The following input width (IW) and output width (OW) constraints must be obeyed due to limited
on-chip memory resources.
Table 6-41. Camera ISP VPBE Resizer Use Constraints
Resizer Use Constraints
Horizontal Resizer Ratio
0.25 to 0.5
0.5 to 4
7 taps
4 taps
0.25 to 0.5
7 taps
OW<=2048
OW<=2048
Vertical Resizer ratio
0.5 to 4
4 taps
OW<=4096
OW<=4096
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The horizontal resizer output rate must not exceed half the functional clock; Moreover, the
horizontal resizer output rate must not exceed 100M pixels/s. This limitation applies only for the
on-the-fly processing input source.
•
Flexible resizing ratios: Independent resizing factors for the horizontal and vertical directions. The
applicable ratio is 256/N, with N ranging from 64 to 1024.
•
Programmable luminance enhancer
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Continuous and one-shot operation
6.4.7.2.2 Camera ISP VPBE Resizer Block Diagram
The resizer module performs either upsampling (digital zoom) or downsampling on image/video data
within a range of 0.25 to 4 resizing. The input source can be sent to either the preview engine/CCDC or
memory, and the output is sent to memory.
The resizer module performs horizontal resizing, then vertical resizing, independently. Between them there
is an optional edge-enhancement feature. This process is shown in
1213
SWPU177N – December 2009 – Revised November 2010
Camera Image Signal Processor
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
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Страница 2868: ...2868 HDQ 1 Wire SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2974: ...2974 UART IrDA CIR SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3054: ...3054 Multichannel SPI SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
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