Image trigger

An image trigger initiates the capture of single or multiple frames of a <a href="/facts/Digital_camera/LSGTserm">digital camera</a> by analysing the signals of its sensor.
For capturing and analysing of fast moving objects (e.g. as in quality control of production lines) modern <a href="/facts/High_speed_camera/xXoRQoHe">high speed cameras</a> are frequently used.
Typically the initiation of an image-series starts as soon as the object is entirely visible in the field of the camera.
By using a so-called "image trigger" this task can be done much faster and more accurately, without the cost and effort of additional equipment as in standard methods (for instance, via <a href="/facts/Cable_release/5uRW43Lh">cable release</a>).
The on-board "ImageBLITZ" image trigger uses the live picture of the camera itself as a flexible and accurate sensor, with the result that the process synchronisation takes care of itself.
By using <a href="/facts/CMOS_camera/6Trt4SWj">CMOS cameras</a> (which provide the information of every single <a href="/facts/Pixel/UzwBvXBV">pixel</a> in digitized form) a fast processing of the supplied data is ensured.
To prepare the ImageBLITZ, a <a href="/facts/Line_segment/V8E0M4qk">line segment</a> of a predefined length is set up in the field of view, just where the triggering event is likely to take place. Then the amount of <a href="/facts/Grayscale/Tjb9kR8v">grey level</a> alteration (and its direction from dark to bright or reverse) is set, as well as the minimum number of affected pixels.
At each triggering event the camera head now sends a <a href="/facts/Film_frame/27Uqo8WN">frame</a> (or a set of frames) to the host computer to be processed or archived for further use.

Image trigger open-in-new

Image trigger