Medical / Vision & Sensors Vision & Sensors - Image Analysis
Using algorithms to extract quantitative information from an
image.  May 14, 2013  Counting objects in an image seems like an
easy task, which can be automated through machine vision and
image analysis, but it becomes difficult when objects touch,
move randomly, or are hard to distinguish from their background.
Image analysis algorithms extract quantitative information from
an image.  These algorithms run on a machine vision system (MVS)
consisting of lighting, cameras, computers and software.  In
this article we’ll look at using machine vision to solve
counting tasks of increasing difficulty. Humans can rapidly
count about four or less objects, a process called subitizing1.
With more than four objects counting slows from 50 to 100
milliseconds per additional object to about 250 to 350
milliseconds per additional object and counting accuracy
decreases.  When you add reaction time2, our counting rate is
probably less than five objects a second.  Ou