Crt display of a motion picture film

Claim 2

In the method of displaying images of respective frames of an image bearing medium where an image is in accordance with the opacity of said medium, said frames being transported at a desired frame rate through a scanning field of an optical scanner where a light spot is directed upon a receiving side of a scanned frame, a video signal proportional to light emanating from a transmission side thereof being provided to a display where a beam traces a viewing raster on a viewing surface, the steps of: generating a displacement signal having a value proportional to the time integral of said frame rate; deflecting said light spot vertically in proportion to the sum of the vertical deflection of said display beam and the value of said displacement signal and horizontally in proportion to the horizontal deflection of said display beam, whereby a scanning raster is traced by said light spot. comparing said displacement signal to a reference signal having a value representative of the displacement of a scanned frame which is about to pass from the scanning field; and resetting said displacement signal to a value corresponding to the displacement of the succeeding frame to be scanned by said light spot in response to the value of said displacement signal being at least equal to the value of said reference signal.

Claim 3

The method of claim 1 wherein said medium is a motion picture film and the step of resetting takes place during the vertical retrace of said scanning raster including the steps of: first providing a horizontal offset deflection of said light spot to an alignment with sprocket holes of the frames of said film; then altering the value of said displacement signal in proportion to the time integral of a reset signal; and sensing light from said light spot being provided through a sprocket hole thereby indicating that the value of said displacement signal is altered to correspond to the displacement of a succeeding frame within said scanning field.

Claim 4

The method of claim 1 wherein the steps of deflecting includes deflecting said light spot to trace the first horizontal line of said scanning raster across the portion of said scanned frame which first passes from the scanning field and tracing successive lines along portions of said scanned frame which respectively leave thE scanning field at successively later times.

Claim 5

Apparatus for displaying images of respective frames of an image bearing medium where an image is in accordance with the opacity of said medium, said medium being transported by a drive unit at a desired frame rate through a scanning field of an optical scanner which provides a light spot to a receiving side of a scanned frame within said scanning field, the image of said scanned frame being displayed on a display of the type where a beam traces a viewing raster on a viewing surface comprising: means connected to said display which are disposed to receive light emanating from a transmission side of said scanned frame, said means providing to said display a video signal representative of the intensity of said emanating light; integrator means connected for response to said drive unit for providing a displacement signal having a value proportional to the time integral of said frame rate; a reference signal source for providing a reference signal having a value representative of the displacement of a scanned frame which is about to pass from the scanning field; comparison means connected to said integer means and reference signal source for providing a comparison signal indicative of the value of said displacement signal being at least equal to the value of said reference signal; resetting means connected to said comparison means and said integrator means for resetting said integrator means to change said displacement signal to a value corresponding to the displacement of a succeeding frame in said scanning field in response to said comparison signal whereby said succeeding frame becomes said scanned frame; generating means for providing horizontal and vertical sawtooth signals having amplitudes respectively proportional to the horizontal and vertical displacement of said display beam on said viewing surface; and deflection means connected to said integrator means, said generating means and said scanner for vertically and horizontally deflecting to said light spot to trace a scanning raster in concurrent response to said sawtooth signals and said displacement signal, said light spot being vertically deflected in proportion to the sum of the value of said displacement signal and the vertical deflection of said display beam and horizontally deflected in proportion to the horizontal deflection of said display beam.

Claim 6

Apparatus for displaying images of respective frames of an image bearing medium where an image is in accordance with the opacity of said medium, said medium being transported by a drive unit at a desired frame rate through a scanning field of an optical scanner which provides a light spot to a receiving side of a scanned frame within said scanning field, the image of said scanned frame being displayed on a display of the type where a beam traces a viewing raster on a viewing surface comprising: means connected to said display which are disposed to receive light emanating from a transmission side of said scanned frame, said means providing to said display a video signal representative of the intensity of said emanating light; integrator means connected for response to said drive unit for providing a displacement signal having a value proportional to the time integral of said frame rate; a reference signal source for providing a reference signal having a value representative of the displacement of a scanned frame which is about to pass from the scanning field; comparison means connected to said integer means and reference signal source for providing a comparison signal indicative of the value of said displacement signal being at least equal to the value of said reference signal; resetting means connected to said comparison means and said integrator means for resetting said integrator means to change said displacement signal to a value corresponding to the displacement of a succeeding frame in said scanning field in response to said comparison signal whereby said succeeding frame becomes said scanned frame; generating means for providing horizontal and vertical sawtooth signals having amplitudes respectively proportional to the horizontal and vertical displacement of said display beam on said viewing surface; and deflection means connected to said integrator means, said generating means and said scanner for vertically and horizontally deflecting to said light spot to trace a scanning raster in concurrent response to said sawtooth signals and said displacement signal, said light spot being vertically deflected in proportion to the sum of the value of said displacement signal and the vertical deflection of said display beam and horizontally deflected in proportion to the horizontal deflection of said display beam.

Claim 7

Apparatus according to claim 4 wherein said resetting means resets said integrator means during a vertical retrace of said scanning raster.

Claim 8

Apparatus according to claim 4 wherein said medium is a motion picture film, said resetting means comprising: photomultiplier means disposed to receive light from a sprocket hole of said film and provide a sprocket signal in response thereto; counting means connected to said photomultiplier means for providing a counter signal in response to a sprocket signal indicative of said displacement signal having a value representative of said succeeding frame; and means connected for response to said comparison and counter signals for applying a reset input signal to the input of said integrator means in response to said comparison signal, said reset signal being applied until said counter signal is provided.

Claim 9

Apparatus according to claim 4 wherein said resetting means provides first and second indexing signals, said first index signal being provided contemporaneously with the resetting of said integrator means, said second index signal being indicative of said displacement signal being representative of said scanned frame, said deflection means comprising: a source of a vertical offset signal; a source of a horizontal offset signal; vertical switching means connected to said vertical offset source and said reset means for providing to said scanner a vertical deflection signal having a value proportional to the sum of the values of said displacement and said vertical offset signals in response to said First indexing signal, said vertical deflection signal having a value proportional to the sum of the values of said displacement signal and the amplitude of said vertical sawtooth signal in response to said second indexing signal; and horizontal switching means connected to said horizontal offset source for providing a horizontal deflection signal having a value proportional to the sum of the values of said horizontal offset and horizontal sawtooth signals in response to said first indexing signal, said horizontal deflection signal having a value proportional to said horizontal sawtooth signal in response to said second indexing signal.