Configuration MC132x
Users Manual Rev. 0.22
26
MC132x has a 16-Bit image counter whose count can replace the first two pixel of every image. The
image counter is cleared with every low to high transition of r7[1], the camera enable bit. It is incre-
mented by every new image.
Command example:
:r7002
r7[1]
Response:
none
6.17 ImageBLITZ
®
shutter release
ImageBLITZ can replace an external signal (e.g.: a light barrier) to release the shutter. Like a light bar-
rier, ImageBLITZ is used to capture fast moving objects on the exact same position on the image.
Contrary to the light barrier, ImageBLITZ uses the same information as condition to release the shutter
as the then exposed image.
ImageBLITZ defines one specific line or a part of the 1024 lines as trigger window. This is true even if
the selected image size is less 1024 lines or outside of the selected image area.
After activation of ImageBLITZ and after issuing the EXP signal as an enable signal, the MC131x
hardware checks the gray values in the trigger window at a repetition rate that is defined by the expo-
sure time selected with bits 3..0 of r6.
If a selectable number of pixels along that trigger window exceed or fall short of a selectable threshold,
one single image is exposed and output.
To adjust ImageBLITZ®, the trigger line can be superimposed to the image. Within the selected line, 10
pixel are displayed as a dotted black- and white line as long as the selected threshold is not passed.
ImageBLITZ is configured with the registers r8..rC
h
:
6.17.1 ImageBLITZ® processing
When ImageBLITZ® is activated with :r7
h
[0] = 1:
1. Wait for an active edge on the EXP input.
2. The MC13xx exposes a line, that was chosen with :rC[9..0] and is called trigger line, for an
exposure time defined by :r2[9..0]. It compares the intensity of a group of 10 pixel along the
selected trigger line against an adjustable threshold (:rA
h
[7..0], Range: 255..0).
3. The number of exceedings (:rA
h
[8] = 0) or fall backs (:rA
h
[8] = 1), are counted, and the re-
sult is compared to a second threshold (:rB
h
[6..0], Range: 127..0).
4. Each time this threshold is exceeded (release condition); an “inhibit counter” (:rD
h
[9..0],
Range 1..255) is loaded.
5. The inhibit counter” :rD
h
[9..0] is counted down, each time the “release condition” was not
reached. Once this “inhibit counter” has expired, a new image is exposed and output.After
image is output, repeat at 1.
6.17.2 ImageBLITZ® programming
ImageBLITZ® is programmed by registers r8..rD
h
and activated with r7[0].
