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)： 41/44頁(yè)
文件大?。?/td> 768K
代理商： AT76C453AC-MY19T
6
5446A–IMAGE–02/06
AT76C453AC-MY19T
First the input black level is restored to have the data referred to digital code "0". Then the raw
RGB signal is applied to a reconstruction function. This function basically generates a triplet of
raw RGB data for every pixel of the video stream. Red, green and blue information are recov-
ered for every single pixel by means of spatial filtering, using the physically surrounding colored
pixels.
Parallel to the reconstruction a contour signal is generated which is later on in the processing
added to the video luminance signal to improve the sharpness impression of the final picture.
Both horizontal and vertical contour information are generated.
Behind the reconstruction function a three by three color matrix corrects for the non-ideal spec-
tral response of the colored pixels. The matrix takes care of the color fidelity in the finally
displayed picture. It matches the spectral sensitivity of the image array with the color response of
the displaying device (CRT is used for default settings).
The succeeding white balance circuit takes care of the color fidelity over a wide color tempera-
ture range. The white balance consists of controllable gain circuits in the red and blue channel.
By default the gains are controlled by the Auto White Balance (AWB) loop which runs on the
embedded micro-controller. The loop takes care that white parts in the scene remain white when
the color temperature of the scene illumination changes.
Besides automatic white balance also fixed white balance settings can be applied. A set of set-
tings is available for incandescent, fluorescent and daylight illumination conditions. If desired the
white balance settings for the red and blue gain can be overruled by the application.
After white balancing the signals are applied to a gamma/knee correction circuit. Knee compres-
sion takes care for the visibility of details in highly illuminated areas. The gamma correction
compensates for the non-linear response of the displaying Cathode Ray Tube (CRT). The
applied gamma correction is programmable in 64 steps. By default the gamma correction is
tuned to be compliant with the normalized ARD gamma-function (0.45 gamma).
5.2.4
YUV Processing
Figure 5-3.
YUV Processing
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