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OV2655 View Datasheet(PDF) - OmniVision Technologies, Inc.

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OV2655 Datasheet PDF : 74 Pages
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5-1
5 image sensor processor digital functions
5.1 ISP_TOP
The ISP_TOP includes all module enable signals, buffer power down and cen control, top level control signals as well
) as ISP modules that require control bytes (WBC, VarioPixel, UV_AVG, and YUV444to422).
ial ly • WBC: White Black pixel Canceling is used to detect and remove defect pixels.
• VarioPixel: This module is used to do pixel 2:1 sub sample in horizontal view. There are various ways to use
VarioPixel function such as give out the average of 2 pixels, give out the first pixel and drop the second, or give out
the second and drop the first.
n • UV_AVG: The U and V average module is used to smooth chrominance to let color image looks better around
edge. It has 2 options to do that: average with 5 consecutive U or V and get median value from 5 consecutive U
or V.
t • YUV444to422: This module is used to convert YUV444 to YUV422. This module has two options: average mode
n O and drop mode.
5.2 ISP DCW, border cutting
e a This part includes the size registers for ISP input windowing, ISP output windowing, and Scaling input windowing. The
ISP input windowing is designed to support digital zoom. It can get any size window in any position. The ISP output
id in windowing and Scaling input windowing are both for cutting some border pixels or border lines which are not good
enough due to algorithm limitation.
f h 5.3 auto white balance (AWB)
The main purpose of the Auto White Balance (AWB) function is to automatically correct the white balance of the image.
n C There are two main functions AWB: AWB_Stat and AWB_Gain.
o • AWB_Stat is used to automatically generate digital gains for different light sources
• AWB_Gain is used to apply the AWB_Stat information gains on RAW data to remove unrealistic color
C T 5.4 gamma
V The main purpose of the Gamma (GMA) function is to compensate for the non-linear characteristics of the sensor. GMA
converts the pixel values according to the Gamma curve to compensate the sensor output under different light strengths.
The non-linear gamma curve is approximately constructed with different linear functions.
O 5.5 lens correction (LENC)
r The main purpose of the Lens Correction (LENC) function is to compensate for lens imperfection. According to the radius
of each pixel to the lens, the module calculates a gain for the pixel, correcting each pixel with its gain calculated to
(Fo compensate for the light distribution due to lens curvature.
07.01.2008
PRELIMINARY SPECIFICATION
proprietary to OmniVision Technologies
 

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