lqr_carver_set_side_switch_frequency - set LqrCarver object side switch
void lqr_carver_set_side_switch_frequency(LqrCarver* carver,
When the function lqr_carver_resize(3) is invoked, it computes a
relevance value for each pixel in the image, then chooses the optimal
seam to carve based on such relvance values. However, in the case two
seams are equivalent (which may happen when large portions of the image
have the same colour, for example), the algorithm always chooses the
seams from one side.
In order to overcome this effect, an option is given to automatically
switch the favoured side during rescaling, at the cost of a slightly
The function lqr_carver_set_side_switch_frequency sets the side switch
frequency to switch_frequency for the LqrCarver object pointed to by
carver. This will have the effect that, for each rescale operation, the
favoured side will be switched switch_frequency times (or as much times
as the number of pixels to rescale).
The default value for newly created LqrCarver objects is 0.
As for the final result, a very small value (e.g. 1 to 4) will
normally suffice to balance the left and right side of the image (or
the top and the boddom sides for vertical rescalings), without
noticeable computational costs. However, in order to obtain a smoother
behaviour for the visibiliy map, i.e. for the intermediate steps,
higher values may be required.
Copyright © 2007-2009 Carlo Baldassi