Method for producing a printing form by means of scanning a master and the recording surfaces in accord with a scanning raster or, respectively, a conforming recording raster upon employment of a random generator for the distribution of smallest points which are still printable to each raster field of the recording surface, whereby the plurality of said points which are still printable determines the respective tonal value and each raster field at the original side is resolved by means of fine-s...

In an arrangement wherein vertical contour enhancement is performed by subtracting a video signal between horizontal scanning lines and applying a white- or black-level signal before or after the contour (edge portion) of an image based on the result of the subtraction operation, the application of the black-level signal is selectively suppressed to diminish unattractive black borders. In another embodiment, application of the black-level signal to portions having a strong red-signal component i...

A system that determines the integration time periods for the channels of a color scanner. The slowest channel or longest time period is used to set a line scan clock period or transfer clock period of the scanner. The exposure start times for the other channels, which are charged faster than the slowest channel, are set relative to the transfer clock. The transfer clock and exposure start time of all channels is adjusted if necessary for the density of the film being scanned.

A closed loop automatic boost control of an aperture correction circuit for a television camera using a high pass filter and thresholding circuitry in order to control the frequency boost by sensing the RMS value of the high frequency noise. The boost is achieved by separating the signal into a flat response and a high frequency boosted response. The amount of boost is determined by passing the high frequency boosted response through a variable gain amplifier.

The system and method are used to convert images on motion picture film or slides to video signals. Color corrections in the video signals are made by adjusting not only the color balance, but also the color hue and saturation, as well as the separate component parts of the luminance signal. During the first phase of operation, the "load" mode, a "standard" set of color correction values is selected so as to provide a video picture which is pleasing to the eye. Then the whole film is color-corre...

A contrast detection analyzer for detecting all edges sensed during a cirar scan and their angles with respect to vertical, wherein an edge near the center of the scan is detected, the angle is measured regardless of the light or dark orientation, and the exclusivity of the edge is determined. The analyzer output is in a digitized format suitable for computer calculations.

A video signal processing circuit, particularly for use in conjunction with a single-tube indexing color television camera, provides an output video signal to which a vertical aperture correction has been added, and which cancels undesired line-to-line amplitude changes, thereby preventing line-crawling distortion. The video signal processing circuit includes an input circuit to which an input video signal is supplied, a delay circuit for delaying the input video signal from the input circuit by...

An image reproducing apparatus for reproducing an image recorded on successive frames of a film having a storage medium which information for each frame is readable from and writable on, the reproducing apparatus includes a pick-up device for picking up the image from the film; a read and write device for reading and writing frame information from and on the storage medium in a specified relative movement to the film; a drive device for rendering the specified relative movement and such special ...

Method and apparatus for examining a gemstone to determine a parameter thereof. A thin beam of light is projected onto the stone, the beam is moved relative to the stone, the position where the beam strikes the stone is sensed in a direction different from that in which the beam is projected, and a parameter is determined making use of information derived from such sensing.

The graphic information contained in the image is converted by means of a television camera to a video signal constituted by a succession of lines, each line being sampled sequentially so as to obtain an ordered series of points which is stored in memory. The method consists in selecting a parent point forming part of an isolated figure of the image. All the points in which the level of blackening on the image exceeds an adjustable threshold value are isolated automatically by marking with an au...