Suppose an image consists of N pixels
and denote the spatial position of the nth pixel {, ..., } nN 1 ! by p xy nn n
T
= ^h and its intensity by . In Let b denote a histogram
bin, being a range of pixel intensities and let () x 1b denote the
indicator function (returning one if xb ! and zero otherwise).
The spatiogram triplet for bin b is then computed as follows:
The normalizing constant h is chosen such that . c 1 b b
B
1
= = /
For bins with , c 0 b = the values of b n and b R are also set to zero
(not of interest). To enable comparison between images of differ-
ent sizes, we normalize all spatial coordinates to the range [-1, 1].
For the purpose of visualization of the highly dimensional spatio-
gram data, [23] proposed spatiogram triple-plots (S1, S2, S3) illus-
trated in Figure 9:
■ S1: connected centers of bins, () xy bb b n = rr
■ S2: b n –positioned counts of bins (the radii of the circles
are proportional to bin counts)
■ S3: b n –positioned variances in the x- and y-direction.
Figure 9 demonstrates that mutually similar pearls produce
similar spatiogram triple-plots.
Suppose an image consists of N pixels and denote the spatial position of the nth pixel {, ..., } nN 1 ! by p xy nn nT= ^h and its intensity by . In Let b denote a histogrambin, being a range of pixel intensities and let () x 1b denote theindicator function (returning one if xb ! and zero otherwise).The spatiogram triplet for bin b is then computed as follows: The normalizing constant h is chosen such that . c 1 b bB1= = / For bins with , c 0 b = the values of b n and b R are also set to zero (not of interest). To enable comparison between images of differ-ent sizes, we normalize all spatial coordinates to the range [-1, 1]. For the purpose of visualization of the highly dimensional spatio-gram data, [23] proposed spatiogram triple-plots (S1, S2, S3) illus-trated in Figure 9: ■ S1: connected centers of bins, () xy bb b n = rr ■ S2: b n –positioned counts of bins (the radii of the circles are proportional to bin counts) ■ S3: b n –positioned variances in the x- and y-direction.Figure 9 demonstrates that mutually similar pearls produce similar spatiogram triple-plots.
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