參數(shù)資料
型號(hào)： AT76C453AC-MY19T
廠商： E2V TECHNOLOGIES PLC
元件分類： 圖像傳感器
英文描述： IMAGE SENSOR-CMOS, 708(H) X 494(V) PIXEL, 30fps, SURFACE MOUNT
文件頁(yè)數(shù)： 43/44頁(yè)
文件大?。?/td> 768K
代理商： AT76C453AC-MY19T
8
5446A–IMAGE–02/06
AT76C453AC-MY19T
5.3
Output Formatting
5.3.1
Scaler
The scaler behind the signal processing chain guarantees an optimum quality video stream for
sub-VGA resolution output formats. Limiting the resolution at the input of the CSP would lead to
color aliasing effects from the reconstruction block because of low spatial correlation between
the image data samples in high frequent areas.
The scaler function performs Region Of Interest (ROI) selection and sub-sampling.
The flexible ROI definition in combination with an up to 5 times sub-sampling ratio, in both hori-
zontal and vertical direction, allows for zooming and a wide range of active resolution output
formats.
In advance of sub-sampling the YUV data passes a selectable low pass filter to suppress alias-
ing artefacts.
5.3.2
Output Formatter
Depending on the desired output format, first a YUV or RGB formatter is passed.
The YUV formatter performs a simple clipper function to limit the data according one of three
supported data ranges.
In case of an RGB output format one can select between an RGB 565, RGB 555 or RGB 444
package formats. The RGB-data is regenerated from the YUV input signals. In this way the sig-
nal conditioning as performed on the YUV data is maintained. To mask the truncation for the
different RGB output formats noise shaping can be applied.
After the YUV/RGB data formatting following functions are passed successively:
Inactive video level insertion. Blanking levels for Luminance (by) and Chrominance (bc) can
be selected. (by/bc = #10/#80 or by/bc= #00/#00)
UV swapping. This function will swap the bytes of UYVY to VYUY, YUYV or YVYU (the
inactive levels are also swapped)
Synchronization code insertion. Optionally synchronization codes according the CCIR656
standard can be merged into the digital video stream.
Data spreading. When the output resolution is reduced by means of sub-sampling, this
function enables it to have a continuous or broken Pixel Qualifier signal during a line period.
5.3.3
Micro-controller (C)
The device is equipped with a 80C51 micro-controller core.
The controller takes care of:
Controlling of auto-loops (AE, AWB, NGC, etc.)
I2C command handling
Power Down
Request processing
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