Datasheet

PDF: 09005aef8202ec2e/Source: 09005aef8202ebf7 Micron Technology, Inc., reserves the right to change products or specifications without notice.
MT9D111__5_REV5.fm - Rev. B 2/06 EN
84 ©2004 Micron Technology, Inc. All rights reserved.
MT9D111 - 1/3.2-Inch 2-Megapixel SOC Digital Image Sensor
JPEG Indirect Registers
Micron Confidential and Proprietary
17 bestPosition uchar 0 RW
This variable is used in 3 different ways depending on values of
bits 6 and 7 of af.mode.
When bit 7 equals 1 (in manual lens control mode), the position
of AF lens can be changed by changing the value of
af.bestPosition, which is interpreted by the AF driver as logical
lens position desired by its user. The AF driver reads
af.bestPosition once every frame, and if it differs from current
logical lens position (afm.curPos), the AF driver gives the AFM
driver a command to make these variables equal by moving the
lens. Physical movement of the lens corresponding to the change
of afm.curPos to af.bestPosition always takes some time, during
which it is best not to change the value of af.bestPosition to
avoid possible errors.
When af.mode bits [7:6] are both 0, af.bestPosition serves to store
AF algorithm output rather than user input.
After both first and second scan, the AF algorithm outputs to this
variable the offset of programmable logical lens position found
to be best relative to the start position of the scan. In other
words, after each scan, the best lens position found is
af.positions[af.initPos+af.bestPosition].
When af.mode bit 7 is 0 and bit 6 is 1 (creep compensation mode
is enabled) af.bestPosition is used during lens repositioning
triggered by setting bit 1 of af.mode to 1. It is used to store the
desired final lens position, which is assumed to be the same as
afm.curPos before the repositioning. As a result after every
successful repositioning, af.bestPosition equals afm.curPos.
18 shaTH uchar 10 RW
Sharpness score variability threshold. Only AF windows whose
min. and max. normalized sharpness scores satisfy the condition
1-(min.score/max.score) > = af.shaTH/256 are used to select best
focus position.
19 positions[0] uchar 0 RW
Programmable logical lens position 0
20 positions[1] uchar 28 RW
Programmable logical lens position 1
21 positions[2] uchar 56 RW
Programmable logical lens position 2
22 positions[3] uchar 85 RW
Programmable logical lens position 3
23 positions[4] uchar 113 RW
Programmable logical lens position 4
24 positions[5] uchar 141 RW
Programmable logical lens position 5
25 positions[6] uchar 170 RW
Programmable logical lens position 6
26 positions[7] uchar 198 RW
Programmable logical lens position 7
27 positions[8] uchar 226 RW
Programmable logical lens position 8
28 positions[9] uchar 255 RW
Programmable logical lens position 9
29 positions[10] uchar 27 RW
Programmable logical lens position 10
30 positions[11] uchar 55 RW
Programmable logical lens position 11
31 positions[12] uchar 84 RW
Programmable logical lens position 12
32 positions[13] uchar 112 RW
Programmable logical lens position 13
33 positions[14] uchar 140 RW
Programmable logical lens position 14
34 positions[15] uchar 169 RW
Programmable logical lens position 15
35 positions[16] uchar 197 RW
Programmable logical lens position 16
36 positions[17] uchar 225 RW
Programmable logical lens position 17
37 positions[18] uchar 254 RW
Programmable logical lens position 18
38 positions[19] uchar 26 RW
Programmable logical lens position 19
Table 15: Driver Variables-Auto Focus Driver (ID = 5) (continued)
Off Name Type Default RW Description