H1A424M167 Datasheet, PDF (33/47 Pages) Hynix Semiconductor – Image Signal Processor for Hyundai CMOS Image Sensor

Hyundai Electronics Industries Co., Ltd.
H1A424M167
l Windows Defined for AE
a
b
a
b
c
b
a
b
a
AE Function Control Register[ABh]
[55h]
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
[ 7..6 ] Weight Mode
[R/W]
These Bits are used to select weight mode of AE Function. When block weight
mode is selected, nine AE windows have different weight. When window
weight mode is selected, nine AE windows have same weight and all the pixels
in the center window(window-c) and window-b will be used for AE but pixels in
the window-a are limited by bit 4 Wweight. When block and window mixed
mode, AE windows have different weights and pixel limit function is on too by
bit 4 Wweight. When Weightless mode is selected, all the original pixel value
in the nine AE windows will be used for AE.
[5]
[4]
[ 3..2 ]
00 : Bweight(Block weight) Mode only.
01 : Wweight(Window weight) Mode only.
10 : BWeight + Wweight
11 : Weightless Mode
Bweight
Two kinds of Block Weight are available when Block weight mode.
0 : Smaller center window weight ( a < b < c )
1 : Larger center window weight ( a < b << c )
Wweight
Windows Weight Selector for AE when Wweight Mode Valid.
0 : Larger Y range is used.
1 : Smaller Y range is used.
Anti_Flicker_Control (Lock Range Selector)
[R/W]
[R/W]
[R/W]
Lock range select for Anti-flicker mode. Small value means fine AE control but
unstable , large value means rough AE control but stable.
[ 1 ] Histogram Equalization Fine Control
[R/W]
This bit defines the Histogram Equalization method when the Histogram
Equalization function is on(Auto Function enable Register[5] = 1).
0 : Use small contrast stretching value
1 : Use large contrast stretching value
[ 0 ] Exposure Time update rate control.
This bit is used to set the exposure time update rate.
[R/W]
1999 October 11
Page 33