Isadora Manual v1.3 - TroikaTronix

Eyes++ (v1.3)
Tracks the position, velocity, size and other characteristics of up to sixteen
objects within a video stream.
Eyes++ uses the standard computer vision technique of tracking blobs – with a blob
being defined as any group of contiguous pixels of a similar color. Because Eyes++
typically tracks the brightness object in the frame, you could say that the similar
color is anything that isn’t black – e.g., the bright objects in the frame. (You can
invert this behavior by turning on the inverse input, in which case Eyes++ tracks the
dark objects in the frame.)
As each new frame of video arrives at the video input, Eyes++ looks for every blob
it can find. Only the largest blobs of those found are tracked. You can use the
objects input to determine how many objects will be tracked simultaneously – this
can be set to as few as one, and as many as sixteen. So, if Eyes++ finds 15 blobs,
and the objects input is set to 5, the smallest ten will be ignored.
Information about the blobs being tracked is routed to Eyes++’s sixteen blob
outputs. These will be connected to a Blob Decoder actor (see page 230) to access
the various characteristics of the blobs being tracked.
To help you configure the Eyes inputs, turn on the monitor input. When you do, a
miniature monitor window will appear in the center of the actor. Each object being
tracked will be surrounded by a colored rectangle – the color indicates which blob
output will be used to report the characteristics of the blob. The table below shows
the relationship between the bounding box color and the blob number.
Isadora Manual
Blob Color Table
275