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Conventional video acquisition systems store images in a computer memory as a matrix of pixels corresponding to the image viewed. This typically requires large storage capacity and long processing times.
English (United States)
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Adaptive Video Image Acquisition System
Conventional video acquisition systems store images in a computer memory
as a matrix of pixels corresponding to the image viewed. This typically requires
large storage capacity and long processing times.
The present system stores images in memory as a table of vectors that
describe the image recorded in terms of a series of horizontal lines which
requires less memory and processing time for acquisition and analysis.
This video acquisition system uses a camera for image pickup, and an
analog to digital converter to produce a binary image signal from the original
analog camera signal. This binary signal is fed to a historizer which counts the
number of pixels that are included in an opening of a masked region for each
horizontal scan of the video image. The vector stored for each horizontal scan is
composed of the start coordinates of the mask edge (x,y) and a count of the
number of pixels included in the mask area scanned. If the mask edge chosen is
a vertical line, then the amount of information stored can be reduced, e.g., for the
unchanging x coordinate.
The historizer operates using a hardware counter which is incremented when
a pixel is detected. When the end of the scanning line is reached the count is
stopped. The count value achieved (i.e., the vector length) is stored in memory,
and the memory location is incremented for the next vector to be stored, thus
building up an image in memory for a mask opening.