Showing papers on "Edge enhancement published in 1974"

Edge enhancement for television images

Abstract: Method and apparatus for enhancing the edges of video images displayed on a cathode ray tube. The scanning velocity of the cathode ray tube electron beam is modulated so as to counteract the blurring effect which occurs when a video amplitude transition causes an increase in beam current and a corresponding increase in the size of the electron beam spot at the screen of the cathode ray tube. When such a transition occurs, the beam is deflected in the direction of normal scan at a rate which corresponds to the rate of change in the size of the diameter of the spot so as to substantially arrest the spot edge, thereby causing a displayed video transition to have a better defined vertical edge. Horizontal edges of images are sharpened by auxiliary vertical deflection of the electron beam. Image edges are further improved by a video peaking scheme which eliminates the large spot size growth usually associated with large amplitude video transitions which have been peaked.

The Prom Device In Optical Processing Systems

Abstract: The operation of an electro-optic image modulator device for use in real-time optical processing systems is described. The PROM (Pockel's Read-Out Optical Modulator) is used to provide temporary storage of image or digital data which can then be read out by a laser for coherent optical processing. The stored image may undergo certain operations, such as level slicing, edge enhancement, or contrast inversion by utilizing the electronic characteristics of the device. This feature is useful for incoherent image processing, and also allows zero order suppression in coherent processing applications. The rapid recyclability, high optical quality and high resolution demonstrated by the device are required for practical utilization of the device in the applications described.