Photron Fastcam SA6 User Manual page 163

Item
Threshold Adjust the acceptable amount of change in the image from the background image.
magnification 100% is the unchanged value of the amount of change calculated from the first
100 images. For example, setting this value to 150% makes the acceptable
amount of change in the image 1.5x the calculated value.
Detection pixel Of the pixels in the detection area, specifies how many pixels to meet the condition
before the trigger is applied. Specify as a percentage of the pixels in the area.
Options "Store the background image when Image trigger close."
Check this option to save the acquired background image when the image trigger
ends. The next time you use the image trigger, you can select the previous
background image that was saved.
"Use background image of live mode was stored, when playback mode"
Check this option and you can use the background image during image trigger
playback that was used during image trigger recording. When using this function,
you must check the "Store the background image when Image trigger close."
option during image trigger recording.
Area parameter Check "Area Specification" and you can specify the area to be the detection target
by dragging your mouse on the desired area or by specifying the values.
Uncheck " Area Specification " to make the entire area the detection target.
Histogram view Check this option to display the histogram.
<When "Level trigger" is selected under "Detection method">
Item
Level mode Specify the direction of change in the brightness value. The trigger is applied in the
situations below.
Level Up
Level Down
Out of Range
Level 1/Level 2 Specify the brightness values to be the threshold values.
Detection pixel Of the pixels in the detection area, specifies how many pixels to meet the condition
before the trigger is applied. Specify as a percentage of the pixels in the area.
Explanation
Explanation
When the brightness value surpasses the brightness
value specified in Level 1
When the brightness value falls below the brightness
value specified in Level 1
When the brightness value deviates from between the
brightness values specified in Level 1 and Level 2
153 Photron FASTCAM Viewer