Datasheet

Confidential for truly Only
color CMOS QSXGA (5 megapixel) image sensor with OmniBSI™ technology
OV5647
proprietary to OmniVision Technologies PRELIMINARY SPECIFICATION version 1.0
4.5.3 average luminance (YAVG)
Auto exposure time calculation is based on a frame brightness average value. By properly setting x_start, x_end, y_start,
and y_end as shown in
figure 4-8, a 4x4 grid average window is defined. It will automatically divide each zone into 4x4
zones. The average value is the weighted average of the 16 sections. table 4-7 lists the corresponding registers.
figure 4-8 average-based window definition
table 4-7 average luminance control function registers (sheet 1 of 2)
address
register
name
default
value R/W description
0x5680 XSTART 0x00 RW
Bit[3:0]: x_start[11:8]
Horizontal start position for average window high
byte
0x5681 XSTART 0x00 RW
Bit[7:0]: x_start[7:0]
Horizontal start position for average window low
byte
0x5682 YSTART 0x00 RW
Bit[3:0]: y_start[11:8]
Vertical start position for average window low byte
0x5683 YSTART 0x00 RW
Bit[7:0]: y_start[7:0]
Vertical start position for average window low byte
0x5684 X WINDOW 0x0A RW
Bit[4:0]: Window X in manual average window mode
high byte
sensor array size X
5647
_
DS
_
4
_
8
average
window
size
sensor array
size Y
start
end
VH
HW
0123
12 13 14 15
8 9 10 11
Y
X
4567