摘要:
A film scanner scans a frame of film three times by reciprocating a clapper gate assembly (160) holding the film (50) past a solid state line array sensor (210). Successive scans are in an opposite sense to the previous scan and R,G,B filter wheel (40) is placed in the optical path and advanced for each scan so that separate high resolution R,G and B scan are produced which can be combined to form a high resolution video signal.
摘要:
A digital video signal and a control plane are stored together by replacing (20) a data word in the video signal (Y, U, V) with a predetermined combination (24) of bits in response to a bit or bits (22) in a corresponding pixel of the control plane (Fig. 5). An image composition system receives the thus combined video signal and control plane and regenerates (2, 6) the control plane data from the predetermined combination of bits (Fig. 2). The control plane can then be used to combine the video image with a second video image.
摘要:
A film scanner scans a frame of film three times by reciprocating a clapper gate assembly (160) holding the film (50) past a solid state line array sensor (210). Successive scans are in an opposite sense to the previous scan and R,G,B filter wheel (40) is placed in the optical path and advanced for each scan so that separate high resolution R,G and B scan are produced which can be combined to form a high resolution video signal.
摘要:
Dans un télécinéma à point d'exploration comprenant un moyen de balayage à tube à rayons cathodiques servant à générer un point d'exploration, ainsi qu'un photodétecteur recevant la lumière transmise par une bande de film balayée par le télécinéma, on a prévu un dispositif de commande provoquant le balayage, par le moyen de balayage à TRC, d'une région (8, 18) correspondant à la position d'une ou de plusieurs perforations (16) dans la bande de film (10) balayée. Le signal de sortie provenant du photodétecteur pendant un balayage de la région (18) fournit un signal de correction servant à régler le niveau des signaux vidé. On procède au balayage de la région (18), de préférence pendant les périodes de suppression de ligne ou de suppression de la trame.
摘要:
A CCD sensor for use in telecine equipment has at least one transport register (40) into which at least some of the sensor photosites discharge. A plurality of detectors n+ (42B, 42C and 42D) are coupled to the transport register (40). Successive charge packets from the register (40) are passed selectively to a respective one of the plurality of detectors n+ in turn.
摘要:
A signal produced by a telecine suffers from losses and defects caused by difference in response to incident light of different areas of the screen area scanned. These differences may arise from burning of the screen, blemishes, dirt in the system, differences in grain size of phosphor particles, missing particles and losses in the internal optical system of the machine. Burn at the ends of video lines may be reduced by reducing the intensity and/or dwell time of the scanning spot on any one area of the screen in the vicinity of the line end. This may be achieved by accelerating the scanning spot at the line ends or defocussing the spot.
摘要:
A line segment display 20 is generated as two peripheral sections 24a, 24b joined by a middle section 22. The middle section is generated as a series of bars of pixels, so that no pixel falls in more than one bar, and a calculation to determine whether or not a pixel is within or outside the line segment is carried out only once for each pixel.
摘要:
@ A microform reader for reading microfilm filmed at a reduction of about 200 times forms an image of a selected page on the microform on a linear solid state sensor which scans down the image of the page to produce a line-by-line or video-type representation of the page for transmission to a remote location. Selected lines of the sensor output are analysed to provide a determination of image parameters and enable the image-forming system to be adjusted to improve the transmitted image quality. Thus each filmed page carries at its head a registration target of well defined shape such that a selected scanned line yields precise information as to the X-Y location of the page. Also selected pages include a focussing target including a pattern carrying a black/white discontinuities. Analysis of the scanned line representing the discontinuities gives a measure of the accuracy of focus enabling appropriate adjustment to be made automatically.