698 |
independently from each other. |
independently from each other. |
699 |
|
|
700 |
\else |
\else |
701 |
The distribution should contain occurrences |
The distribution should contain occurrences of |
702 |
as many different features |
as many different features |
703 |
as possible, and |
as possible, and |
704 |
the features should be distributed |
the features should be distributed |
729 |
in order to produce a unique background from |
in order to produce a unique background from |
730 |
a random vector. |
a random vector. |
731 |
Features that are orthogonal for human perception |
Features that are orthogonal for human perception |
732 |
(e.g.,~color and direction of fastest luminance change) |
(e.g.,~color and the direction of the fastest luminance change) |
733 |
should be independently random, and features not orthogonal |
should be independently random, and features not orthogonal |
734 |
(e.g., colors of neighbouring pixels) |
(e.g., colors of neighbouring pixels) |
735 |
should be correlated so as to maximize the entropy. |
should be correlated so as to maximize the entropy. |
767 |
% relatively small basis size, not to have too many features. XXX why? |
% relatively small basis size, not to have too many features. XXX why? |
768 |
|
|
769 |
|
|
770 |
An important point is generating the backgrounds is that |
An important point in generating the backgrounds is that |
771 |
the texture appearance should have {\em no correlation} with any attribute |
the texture appearance should have {\em no correlation} with any attribute |
772 |
or content of the document |
or content of the document |
773 |
so that the textures of any hyperlinked documents |
so that the textures of any hyperlinked documents |