The Digital Fact Book - Quantel

Flash – double and tripleDouble flash is commonly used in film projectors so that each of the 24 f/s is shown twice– a total of 48 f/s. This means the movie presentation has less flicker. Triple flash is betterstill with a frames rate of 72 f/s.FWhen presenting 3D cinema, the left and right eyes want motion and the parallax to appearat the same time but the sequential frame presentation of 3D, often using a single projector,naturally offsets motion timing. Double, or better triple, flash improves the motion portrayal.Here total frame rates are double that of 2D, so:single flash is 48 f/sL1, R1, L2, R2, etc.double flash is 96 f/sL1, R1, L1, R1, L2, R2, L2, R2 etctriple flash is 144 f/sL1, R1, L1, R1, L1, R1, L2, R2, L2, R2, L2, R2 etc.Note that the cine player offers only 24 left and right frames/s. It is the job of the projectorto present each frame two or three times. Of course, the projector has to be capable of clearlyshowing frames at that rate.Floating edges or Floating window (Stereoscopic)See: Breaking the frame (Stereoscopic)FlopA floating point calculation per second. Flops are a measure of processing power and todaythis runs into Gigaflops. For example, the powerful Cell processor used in PlayStation 3 is ratedat somewhere between 218 and 250 Gigaflops.Format conversionChanging the format of television or other moving media images without changing the vertical(frame or field) refresh rate. So, starting with 1920 x 1080/50I and converting to 720 x 576/50Iis a format conversion. This only alters the format spatially, changing the vertical andhorizontal size which technically is a relatively straightforward task. Note that this may includeaspect ratio conversion (ARC) typically to account for 16:9 and 4:3 displays.See also: ARC, Down-res, Standards conversion, Up-resFormat (television)General term to define television pictures by the number of active pixels per line and numberof active lines. For example, SD digital television in Europe has a format of 720 x 576 and1920 x 1080 is an HD format.See also: Standards (television)88