Abstract: A luminaire comprises a relatively thin and flat light-emitting panel (1) having a light-emitting window (2) and, opposite said light-emitting window, a rear wall (3) with opposed edge surfaces (4, 14). At least one of the edge surfaces (4) is light transmitting and associated with a plurality of light sources (5, 5′, 5″, . . . ). Light originating from the light sources (5, 5′, 5″, . . . ) is spread in the panel (1). The invention is characterized in that a plurality of deformities (7, 7′, 7″, . . . ; 8, 8′, . . . ) is provided in the panel (1) for extracting light from the panel (1) via the light emission window (2). The deformities (7, 7′, 7″, . . . ; 8, 8′, . . . ) are clustered so as to form at least one light symbol (27; 28). The configuration of the clusters (17; 18) of deformities (7, 7′, 7″, . . . ; 8, 8′, . . . ) corresponds to the shape of the light symbol (27; 28).

Abstract: A method for writing an optical record carrier, in which a mark representing recorded data is written in the record carrier by a sequence of radiation pulses. The radiation power has a different level in between the pulses of a sequence and immediately after the last pulses of a sequence. This allows an independent control of the leading and trailing edge jitter of the marks written.

Abstract: A compression method and apparatus are provided for use in image data processing where two-dimensional pixel images have respective absolute depth values specified per pixel, and that depth data is required to be compressed prior to transmission or storage with the image data. The process of compressing the depth data per image begins by determining patches of adjoining pixels of the image (90), which pixels of a patch have the same or similar depth values, and assigning a common depth value to all pixels of the patch. Next, pixel patches having the same or similar common pixel depth values are grouped together (92), and a common depth value is assigned to all pixels of the patches so grouped, following which for each discrete pixel depth value, a determination is made (94) as to the area or number of pixels of the image having that depth value. For the smallest of these areas, the depth value of each of those pixels concerned is modified (100) to the nearest existing discrete depth value.