Abstract: A method of and apparatus for displaying an image clip comprising a plurality of image frames on an electronic monitor includes separating each image frame from the next image frame by an overscan period. In this way image frames captured at a first frame rate can be displayed at the first frame rate on a monitor arranged normally to display images at a second frame rate, different to the first frame rate. In practice, the overscan period is created by adjusting driving circuitry for the monitor to increase the number of lines of data output to the monitor during a frame or field period whilst maintaining the line rate constant.

Abstract: A video processing system which can produce a different shape of output picture than the input. Addresses into which incoming picture points must be written to produce the desired shape changes are stored in a shape store. These addresses can also be manipulated in real time so that the position of the shape they define is changed. For example a Mercator projection of a map can be projected onto a globe and this globe could then be tilted, rotated etc.

Abstract: A video signal processing system changes the shape of a video frame so that it appears to take the form of a three dimensional object. The system also applies shading to the object in response to an imaginary light source. The address data is processed to produce light intensity factors and the value of each pixel in each video frame is adjusted in response to a light intensity factor.

Abstract: A system for converting video signals from a scanner from, for example, an air surveillance system comprising an interface (2) which applies incoming video signals directly to a bulk store (5) and to a scan converter (4). The interface can also apply signals from the bulk store to the scan converter. The signals received from the bulk store can be processed differently from those received directly by the scan converter. This system allows maximum possible resolution of the image to be maintained for zoom in and for roaming.

Abstract: A video processing system in which the shape or size of an image can be altered by providing a map of address signals representing the addressess in the store to which input video signals must be written to produce the desired change. These addresses can be manipulated so that there are a number of changes to the image. Where there is an expansion in the image the address signals are filtered to prevent picture break up. The incoming video signals are written into the filtered addresses and then new picture points are interpolated to produce the desired expansion.