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ICM515NB Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers

Part No. ICM515NB
Description  Color CMOS Image Sensor With 574x483 Pixel NTSC Composite Video Output
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ICM515NB Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers

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ICM515NB 574x483 Pixel CMOS NTSC Sensor
Data Sheet V1.0 November 2002
©2000, 2001,2002 IC Media Corporation & IC Media Technology Corp
1/17/2003
page 6
Company Confidential
2.2 Color Filters and Image Signal Processing
Each pixel is covered by a color (R, G, or B) filter. Since each pixel only gets part of the spectral band, the data
need further processing (i.e., color interpolation and color correction) in order to produce the full visible spectrum
for best image quality.
ICM-515NB incorporates the following digital signal processing functions.
An automatic exposure (AE) time control to accommodate for different brightness, the AE feature will adjust the
exposure time thru various gain control mechanisms to achieve the appropriate brightness.
An anti-flickering control circuit to eliminate flickering caused by a 50Hz or 60Hz light source normally found
indoors.
A color interpolation and Automatic White Balance (AWB) module to perform color interpolation and gain on
each color pixel to obtain a set of correlated RGB value for each pixel. The result of this operation is a data stream
consisting of 24-bit RGB per pixel with balanced color components.
A color control module to adjust color contrast, hue, and saturation.
To boost darker signal to match the video monitor characteristic, gamma correction are performed:
where Vi is normalized (ranged from 0 to 1) R, G, or B signal coming from the white balancing module, and Vo is
normalized final output. The parameter
γ is programmable with default value of 2.2.
2.3 Output Format
The output format of ICM-515NB is analog composite video output suitable for TV display. This output is tied
through a parallel 75
Ω ohms resistor to ground, and to a pi-network of one 1.7 µH inductor and two 560 pF
capacitors, before connecting to a 75
Ω cable.
γ
/
1
i
o
V
V
=


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