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RMV Operations Manual Revision Copyright illunis LLC, 2014
Page 98
6.12: Image Detectors
Exposure Histogram Detector
The Brightness detector is used to measure the
brightness of the image within the auto exposure detector
(AED) window.
The Exposure Histogram Detector is used to
measure the number of pixels at specific brightness levels
through the concept of bins. Bins are used to count the
number of pixels within two ADC values that occur in the
AED window. The bin sizes are determined by three regis-
ter values that define points in the ADC count. There are
five bins. The typical usage of the bins are: BIN0 is used
for black measurement, BIN1 and BIN2 are used to meas-
ure mid range, BIN3 is used to measure bright points and
BIN4 is used to measure saturated pixels.
In addition to the histogram bin counts a reference
count of the number of pixels in the AED window is provid-
ed. This reference count can be used easily to calculate
percentages of pixel counts within the bins.
Serial Commands
Target
Index
Command
R/W Description
04
1a
Read Bin and AED size values
R
0x0011 = Bin #0
0x0012 = Bin #1
0x0013 = Bin #2
0x0014 = Bin #3
0x0015 = Bin #4 = # sat pixels
0x0016 = Number of pixels in
03
03
0c
13
AE Histogram Point
Register Address
R/W Location in histogram bin point in units
of 16 DN
0x004A = Set AEH point #1
0x004B = Set AEH point #2
0x004C = Set AEH point #3
04
19
Show Detectors
W
0x000A = Blooming
0x0009 = disable
Quick FAQ’s:
►The Saturated Pixel Counter (SPC) uses bin 4.
►The bin register values are in units of 16 DN.
►The PT1 value is usually 4X the black clamp
►The PT2 value is usually one half the max count
►The PT3 value is usually 85% the max count
►Typical register values for the points are
PT1: 0x08 = 0x08 * 16dec = 128 dec DN
PT2: 0x80 = 0x80 * 16dec = 2048dec DN
PT3: 0xE0 = 0xE0 * 16dec = 3568 dec DN
►The Auto exposure OSD displays the bin counts
and a new super cool bar graph display !
0
4095
P
ix
e
ls
@
D
N
DN
PT1
PT2
PT3
PT4 = 4094
B
IN0
B
IN1
B
IN2
B
IN3
B
IN4