Specifications

Chapter 9 Operating Vision Manager
9-49
Lower Upper Lower Upper
After binary coding
A
fter binary
coding
Fig. 2
Object
Back-
ground
Fig. 1
Before binary
coding
Brightness0 255
- Histogram -
Here, histogram refers to the counting of the frequency of appearance of
brightness values, for a range specified by the window of the image data
input from the camera. When graphically displayed, the histogram provides
ease of understanding the distribution state of brightness, which makes it
easier to determine the binary-coded level, when image data is being
binary-coded. Moreover, the µVision board provides a function for
automatically determining the binary-coded level. This function determines
the binary-coded level by using the histogram.
Figure 1 shows the histogram of image data before it is binary-coded,
showing that the object and background are separated into two portions.
Figure 2 shows the result of binary-coding, on the different binary-coded
level, the lower limit (lower limit of binary) and the upper limit (upper limit o
f
binary) are adjusted to produce different binary-coding results.
Number of pixel