Datasheet

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MT9D111__5_REV5.fm - Rev. B 2/06 EN
80 ©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
Flicker Detection
Table 14: Driver Variables−Flicker Detection Driver (ID = 4)
Offs Name Type Default RW Description
0vmtvoid*
59884 RW Reserved
2 windowPosH uchar
29 RW Width of flicker measurement window and position of its
left boundary X0
Bits [3:0]
—width (in units of 1/16th of frame width)
decremented by 1
Bits [7:4]
—X0 (in the same units as the width)
At the beginning of each flicker measurement, the top
boundary (Y0) of the flicker measurement window is set
at row 64. Average luminance in the window is measured
by the IFP measurement engine and stored in fd.Buffer[0].
Then Y0 is incremented by fd.windowHeight and the
buffer index by 1. By repeating these steps 47 times, the
entire fd.Buffer is filled with average luminance values
from a vertical array of 48 equal-size windows.
3 windowHeight uchar
4 RW Bits [5:0]
—flicker measurement window height in rows
4modeuchar0
RW Mode switches and indicators
Bit 7
—1 enables manual mode, 0 disables it
Bit 6 —0 selects 60Hz settings for manual mode, 1 selects
50Hz settings
Bit 5
—read-only, indicates current settings (0–60Hz,
1–50Hz)
Bit 4—1 enables debug mode, 0 disables it
Bits [3:0]
—read-only, reserved for auto FD
5 wakeUpLine uint 64
R Number of image row at which MCU wakes up to perform
flicker detection. Changing the value of fd.wakeUpLine
has no effect on the functioning of the FD driver, because
it does not use this variable. It simply sets it to 64 at
initialization, to indicate the top of the flicker
measurement area. See fd.windowPosH above.
7smooth_cntuchar
5 RW Reserved
8 search_f1_50 uchar
30 RW Lower limit of period range of interest in 50Hz flicker
detection. If the FD driver is searching for 50Hz flicker and
detects in a frame a flicker-like signal whose period in
rows is between fl.search_f1_50 and fl.search_f2_50, it
counts the frame as one containing flicker.
9 search_f2_50 uchar
32 RW Upper limit of period range of interest in 50Hz flicker
detection. See fd.search_f1_50 above.
10 search_f1_60 uchar
37 RW Lower limit of period range of interest in 60Hz flicker
detection. If the FD driver is searching for 60Hz flicker and
detects in a frame a flicker-like signal whose period in
rows is between fl.search_f1_60 and fl.search_f2_60, it
counts the frame as one containing flicker.
11 search_f2_60 uchar
39 RW Upper limit of period range of interest in 60Hz flicker
detection. See fd.search_f1_60 above.
12 skipFrame uchar
0 RW Skip frame before subtracting two frames.
13 stat_min uchar
3 RW Flicker is considered detected if fd.stat_min out of
fd.stat_max consecutive frames contain flicker (periodic
signal of sought frequency).
14 stat_max uchar
5 RW See fl.stat_min.