Digital Signal Processing Reference
In-Depth Information
used the same parameters for both techniques, such as the number of bins (Fig. 6.b.)
and the value of
λ
(Fig. 7), which strongly affect the final results. Fig. 6.b presents the
error value for the images pair “stone” while varying the number of histogram bins
from 5 to 40. We remark that 10 bins per color channel works well since we obtain
0.8% as error value with the proposed technique, in contrast to [3] for which an error
value of 1.2% was recorded. We can also note that starting from 15 bins, the error
value increases remarkably for both techniques. Concerning the used value of
λ
, the
extracted foregrounds were compared with these produced by [3] while varying the
value of
λ
from 1 to 10
-4
for the “stone” pair of images (Fig. 7). We can clearly deduce
that, comparatively to [3], the proposed technique is much less sensitive to the
value of
λ
.
(a) (b)
Fig. 5.
Subjective evaluation: (a) comparison of our results with those of [3]: the first row
shows the images pair, second and third rows illustrate respectively the results of [3] and our
results, (b) some results obtained by the proposed technique
(a) (b)
Fig. 6.
Objective evaluation: (a) comparison of the error values of the proposed technique and
those of [3], (b) influence of the bins number on the error value for the “stone” images
pair
