Phytec eGrabber-4plus, Hardware Manual

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eGrabber-4plus
62 
PHYTEC Meßtechnik GmbH 2004 L-608e_4
4.6 Special Functions
The demo program offers several special functions to manipulate and
analyze image contents.
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Display Histograms
Histogram enables a histogram to be calculated from a static
image, i.e. an image obtained using the Snapshot.
A histogram provides the distribution of the gray- or color values
of an image.
The relative Frequency of the corresponding intensity values are
represented by brightness, as well as the intensity (see Figure 32).
Figure 32: Histogram
The X-axis includes the values between 0 and 255. Using the
check boxes in the histogram window, the curves of gray values,
or the separate color values, can be turned on/off.
Caution:
A histogram can only be created from a static image, and not from
a live image. To create a histogram for a live image, you must first
create a static image using the snapshot function.