Binary Matched Filtering
Binary Matched Filtering with Pre-Processing
Techniques to Improve Matched Filtering
Binary Matched Filter with Pre-Processing
by Robert Sparr
Second Approach
Since the absolute pixel values representing the facial and eye tone will vary with image subject, lighting conditions, etc., we decided to binarize our matched filter to enhance the contrast in the pattern.
Figure 3. Binary matched filter based on Lenna's right eye.
Figure 4. Lenna (shown for reference) and result of Lenna filtered with figure 3, contour plot and direct plot.
As you can see, the binary filter does produce a sharper result in this example. The detection peak at Lenna's right eye is quite a bit narrower and higher above the rest of the image than in the previous example. Unfortunately, however, false peaks remain in the same locations noted before, and the detection peak at Lenna's left eye is lower than many of these.
jchen@micro.ti.com
tdorney@ti.com
sparr@owlnet.rice.edu
Last updated on May 3, 1997
Copyright © 1997 All rights reserved.