ICM107B Mega pixel CMOS sensor

Data sheet Version 0.5, January 2002

©2000, 2001,2002 IC Media Corporation & IC Media Technology Corp

10/29/2002

page 7

Confidential

2.2 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

2.3 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 31.25

µs (assuming the line length is

1500 @ 48 MHz). If the number of lines per frame is set at 1100 (the default), the exposure time can vary

from 1 to 1100 lines. In addition, users can adjust registers AD_M1_L, AD_M1_H, AD_M2_L,

AD_M2_H, AD_M3_L, AD_M3_H, AD_M4_L, AD_M4_H, to optimize the individual R/G1/G2/B gain

(default at 3.8 format for 1/256 to 8) of the 4 Bayer pattern pixels separately.

2.4 Timing Control

Timing control is performed with programming a 32-entry wave table. Its content can be filled by external

circuitry after power up if other than default values are desirable. Bits 19 to 11 are the control signals. Bits

10 to 0 are the change position. Whenever the change position equals the column counter, a new set of

signal values are applied. Please see the Wave Table Programming section for details.

R

G

R

G

R

G

R

G

G

B

G

B

G

B

G

B

R

G

R

G

R

G

R

G

G

B

G

B

G

B

G

B