Method and device for protecting displays from burn-in effect
The invention concerns a device and a method for protecting display time. The image processing method according to the invention comprises a step of shifting pictures by a pattern at a pixel shift frequency characterized in that the frequency is changed for a group of at least one picture depending on a motion degree of the group.
1. Method of image processing for burn-in protection in a picture display device, comprising shifting pictures by a pixel shift pattern at a pixel shift frequency; wherein said frequency is dynamically adjusted for a group of at least one picture depending on motion data of said group and the pixel shift frequency value is inversely proportional to said motion data.
2. The method according to claim 1 , wherein said motion data is computed by:
collecting n motion data samples relating to m pictures, m<=n; and
averaging said n samples to get a motion data average for said m pictures.
3. The method according to claim 1 , wherein the method comprises:
defining K motion ranges;
associating a pixel shift frequency to each motion range;
computing a motion data for a group of at least one image;
selecting the motion range including the computed motion data; and
changing pixel shift frequency with the pixel shift frequency associated to said selected motion range.
4. The method according to claim 3 , wherein the pixel shift frequency is changed only if at least T consecutive computed motion data belong to the same motion range.
5. The method according to claim 4 , wherein said motion data is computed by:
collecting n motion data samples relating to m pictures, m<=n; and
averaging said n samples to get a motion data average for said m pictures.