Image Processing Reference
In-Depth Information
Fig. 6. An average of the spectrogram of projections of Radon of a fragment of the image
dimension 1024x1024 pixel for corners from 0 to 360º
In figure 7 the two-dimensional dependence diagram of a magnitude average calculated on
a set of image Radon transforms is shown where peak of normalized averaged spectrum
located at 10
º
of Radon transform for angles from [5
º
..15
º
], applied to the image with an
initial rotation angle of 10º and image scaling factor varied from 1 to 0,1 by 0,1 step. Even at
0.2 scale coefficient the maximum, which corresponds to correct rotation angle, is visible, so
rotation operation can be undone. In figure 6 values of spectrogram average of Radon
transform (rotation angles from (0
º
..20
º
)) for 80 images obtained from one camera and
rotated by 10
º
(a) with histograms (b) are shown.
Fig. 7. Dependence of a normalized mean value of averaged spectrum on scaling factor and
angle of a Radon projection