| abstract |
A system including a camera, display screen and processing device. A privacy mask obscures a portion of displayed images. The processing device transforms the privacy mask in accordance with changes in the field of view of the camera, wherein in a first field of view, the privacy mask is defined by a plurality of vertices having co-ordinates (x1, y2) - (xn, yn), and in a second field of view, the processing device determined transformed co-ordinates (x'1, y'2) - (x'n, y'n) for each of the vertices based on changes in the field of view of the camera. The privacy mask 186 is definable by a plurality of pixel blocks wherein at least one location point for each block is identified to represent one of the said mask vertices. The pixel blocks may be pixel rows wherein opposing ends R'2L, R'2R of each of the rows are identified to represent the mask vertices and the mask may include at least on non-perimeter block entirely circumscribed by pixel blocks forming a portion of the privacy mask. The privacy mask may also include an unmasked area 190 completely encircled by a masked area 186. |