Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ICM205B Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers

Part No. ICM205B
Description  VGA/QVGA CMOS image sensor with digital YUV output
Download  41 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  ETC1 [List of Unclassifed Manufacturers]
Homepage  
Logo 

ICM205B Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers

Zoom Inzoom in Zoom Outzoom out
 7 / 41 page
background image
ICM205B: VGA CMOS sensor with digital YUV output
Data Sheet V1.3, Oct. 2002
©2000, 2001, 2002 IC Media Corporation & IC Media Technology Corp.
10/16/2002
web site: http://www.ic-media.com/
web site: http://www.ic-media.com.tw/
page 7
7
Functional Description
Image Array
The image array consists of 640x480 pixels. Each pixel has a light sensitive photo diode and a set of
control and transfer transistors. At the beginning of the cycle, a row of pixels are pre-charged to its
maximum value. Then they are exposed to light for several lines worth of time and sampled by the ADC.
Correlated double sampling (CDS) is performed by subtracting the reset value (sampled right before
sampling the signal) from the signal value. The purpose of CDS is to eliminate the point-wise fixed
pattern noise (FPN). The output of CDS is approximately proportional to the amount of received light,
ranging from 0 to 255.
Color Filter
Each pixel is covered by a color filter. They form the Bayer Pattern as shown in Figure 2. (Row 0, Column
0) is covered by a Red filter, (Row 0, Column 1) and (Row 1, Column 0) by Green filters, and (Row 1,
Column 1) by a Blue filter. Since each pixel only gets part of the frequency band, the data need further
processing (i.e., color interpolation and color correction) in order to approximate the full visible spectrum.
Figure 2. Color filter Bayer pattern
Exposure and Gain Control
The brightness of the scene may change by a great amount that renders the captured image either
over-exposed or under-exposed. To accommodate for different brightness, the user may change the
exposure time by adjusting the AD_EXPOSE_TIMEH, and AD_EXPOSE_TIMEL. The exposure time is
measured in terms of the time to read out one line of data, which is equal to 64
µs (assuming the line
length is 770 @ 24 MHz). If the number of lines per frame is set at 520 (the default), the exposure time can
vary from 1 to 519 lines.
50/60Hz anti-flickering control
To eliminate the flickering caused by the 50Hz or 60Hz light source normally found indoor, an
anti-flickering control circuit is build in. The selection is between off and on. When it is on, then the
selection is between 50 or 60Hz.
R
R
G
G
R
R
G
G
G
B
G
B
G
B
G
B
R
R
G
G
R
R
G
G
G
B
G
B
G
B
G
B


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn