Abstract:
A rotary gate (1) for digitally scanning frames of a motion picture film (5) has a motor drive wheel (3) and a coaxially spaced free wheel (13) which support and engage sprocket holes (12, 14) in the film (5). The free wheel (13) has no connection to the driven wheel (3) other than the film (5) which rotates the free wheel (13) as it is driven by the drive wheel (3) for advancing the film (5) through the gate (1). A light source (21) and sensor (24) are provided on opposite sides of the film (5) for illuminating the film (5) and digitally scanning motion picture frames (19). Sprockets (11) on the drive wheel (3) are profiled to stabilize the film (5) laterally while it is advanced for scanning of each frame (19). A fixed disc with a smooth track may be substituted for the free wheel (13) for supporting the film (5).
Abstract:
Apparatus (10) for positioning film media (30, 50) in alignment with video imaging means includes frame means having a window (28), primary gate means (12) mounted on the frame means for holding film media in a first plane, secondary gate means (13) mounted on the frame means for holding film media in a second plane, and, sensor (14) for detecting the presence or absence of film media whereby the video imaging means is caused to move with respect to the primary and secondary gate means to focus on the film media. A carrier (61) comprising a base (80) and cover (81) is provided with a channel (83) for filmstrips (50). The base and cover snap together for the removal and insertion of filmstrips. A plurality of notches (78) are associated with each frame (76) for accurate positioning of the filmstrip.
Abstract:
The invention relates to a lighting arrangement for a film scanner, comprising a line sensor, a light source and an optical device for generating a diffuse line shaped illumination on the film. The optical device comprises a cross-section transducer (16) made from a bundle of optical fibres, comprising a flat cross-section on a light input surface (15) and a line shaped cross-section on a light output surface (18), in addition to an integration bar (19), which conducts light to the film from the light output surface of the cross-section transducer (16).
Abstract:
One or more lenses (10) are revolved around an axis (12) normal to a flat scan plane (21) to provide a scanning mechanism for exposure onto (or reading off of) a flat plane of a substrate (20). The data for the image is remapped electronically or in software to compensate for the curved path (13) of the focal point of the scanning lens. combined with a conventional scanning mechanism (35, 40) in a second axis, an area scan is accomplished inexpensively on a flat plane.
Abstract:
A telecine can be adapted to write video signals onto film. The film gate and flying spot scanner (12) are enclosed in a light tight shield (30) and an R, G, B clear, colour filter wheel (134) is interposed in the optical path (34) between the scanner and the imaging optics (113). The CRT grid is modulated sequentially by R, G, and B components of the video signals which are preprocessed for shading and colour errors. The film may be scanned a number of times under the modulation of each component, displaced in both X and Y directions to increase resolution. In a preferred embodiment the scan is displaced by a 1/4 pixel for each of four scans to increase horizontal resolution and, for each displacement, four scans are performed each 1/4 line spacing apart to increase vertical resolution. Thus, each frame is scanned 16 times per colour component, and 48 times in all.
Abstract:
A film video player for producing a standard television signal from photographic film includes an image sensor for sensing a film image illuminated by a pulse of light from an electronic strobe light. The electronic strobe light includes a high voltage power supply with a voltage greater than the minimum ignition voltage of a flash tube in the strobe light for igniting an arc in the flash tube, a low voltage power supply having a voltage less than the minimum ignition voltage of the flash tube for producing an extended pulse of light of constant intensity, means including a photocell for sensing the quantity of light produced by the flash tube and including a control device in series with the flash tube for terminating the pulse of light after a predetermined quantity of light is produced, and means for dispersing the light from the flash tube to produce more uniform illumination. The film video player has the advantage of providing a video signal free from visible flicker, of uniform intensity, and constant color balance. A further advantage is that the video player generates very little heat from its electronic strobe light source and therefore requires minimal cooling.
Abstract:
There is herein described a method for the calibration and validation of motion picture scans using a transparent calibration pattern (14) being placed in front of or behind a motion picture film (10) wherein the calibration pattern is measured through perforations (12) in the film.
Abstract:
One or more lenses (10) are revolved around an axis (12) normal to a flat scan plane (21) to provide a scanning mechanism for exposure onto (or reading off of) a flat plane of a substrate (20). The data for the image is remapped electronically or in software to compensate for the curved path (13) of the focal point of the scanning lens. combined with a conventional scanning mechanism (35, 40) in a second axis, an area scan is accomplished inexpensively on a flat plane.
Abstract:
A lamp, a film guide, and a photosensitive detector are combined into an optical system contained in a portable device that generates electrical signals representing images recorded on motion picture film. The film guide has a surface proximate to the motion picture with an aperture therein through which light from the lamp passes to image the film on the photosensitive detector. A digital processor, which is electrically connected to the photosensitive detector processes an electronic signal output by the photosensitive detector. To provide compactness, the optical system has a folded path comprising three segments each separately mounted on a different surface. The first segment includes the lamp, the second includes the film guide, and the third includes the photosensitive detector. An optical detector positioned so as to receive light from the lamp enables adjusting the device when the device is moved to a location where the temperature and other environmental conditions change. This configuration also finds use when the device is located in an environment whose temperature remains consistently hot.
Abstract:
The invention relates to a digitizing apparatus (1) for forming (digitizing) a digital, electrical image of a subject (3). The digitizing apparatus (1) comprises a light sensor (4) consisting of one or several photosensitive picture elements (P1, P2, ..., P10) and to which the image of the subject (3) is arranged to be directed in one or several parts, the image being divided into pixels. Each picture element (P1, P2, ..., P10) to be used in digitizing is arranged to conduct a photoelectric conversion to generate a signal proportional to the lightness of the pixel directed to the picture element. At least one pixel to be digitized is arranged to be subjected to at least two conversions. In at least two different conversions, the quantity of light to be directed during the conversion of said pixel to the picture element conducting the conversion is arranged to be adjustable, wherein in at least two conversions, the quantities of light are unequal.