Automated encoded signal color image compositing

Details Automated encoded signal color image compositing Automated encoded signal color image compositing

H - Electricity

04

N

350/42

H04N 9/04 (2006.01) H04N 9/75 (2006.01)

Patent

CA 1207078

44 ABSTRACT A method and apparatus to cause a colored backing to be replaced by a background scene, such that the composite scene shows no loss of detail, no edge anomalies, no evid- ence of a colored backing having been present, and no evid- ence that the final scene is a composite, even when the foreground scene contains fine strands of hair, glassware, smoke, fog, or other semi-transparent subjects. Control signals Eb and Ec are created to cause the foreground and background scenes to mutually interact in a natural manner, so that shadows on the colored backing appear as shadows on the background scene, and the luminance of the background selectively causes back and edge lighting of foreground subjects. The hue and luminance of the colored backing are continuously and automatically tracked and removed by a subtraction process. The background level is automatic- ally held constant even though backing illumination changes. Hue and luminance removal and background level are control- led by comparators (35,36) and digital counters (39,40). Levels set by the automatic circuits are retained when the camera pans off of the (blue) backing. No disturbance occurs to the picture when the camera returns to the back- ing. Digital memories have manual override (64), allowing the creation of night scenes and other special effects. Chroma and luminance removal are performed by a subtract- ion process on the encoded video signals in both the NTSC and PAL systems. Chroma removal in the PAL system is acc- omplished by independently tracking (115, 116) the chroma of each line, and is not affected by PAL quadrature errors. The blue cast on foreground subjects caused by lens flare and secondary illumination of the subject by the blue back- ing is removed from the composite image. Such discolor- ation of the subject may also be removed (121,122) from the subject in the foreground scene when it is not being composited.

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