Abstract: The color balance, hue, saturation, luminance, and other parameters of digital video signals are corrected entirely in the digital domain. Correction signals are combined with the digital video signals and new digital video signals are created to replace the original signals. Thus, color correction is performed without victorial addition or similar techniques. A digital "six-vector" color correction circuit, as well as an infinitely variable color selection correction circuit are provided. Also provided is a window for isolating the color corrections, with the capability of limiting the isolation provided by the window to a single selected hue so that one color can be corrected under the restrictions of the window, while others are corrected free of those restrictions. A separate window can be provided simultaneously for each of six colors and the infinitely variable correction circuit. Different corrections of the same color can be made inside and outside of the window.

Abstract: Video signals from two different sources are interwoven with one another so that segments of one picture are intermixed evenly with segments of another picture. It is preferred that the segments be interwoven in a checkerboard pattern, with at least one pixel from each picture forming adjacent elements in the pattern. In one embodiment using a pattern in which only one pixel forms each element, a selected image in one frame of a video program can be readily aligned with the same image appearing in a different frame. Both images are visible simultaneously. The zoom and/or horizontal and vertical pan control on a telecine or other video signal source then can be used to match and align the images in size and position. In another embodiment, the checkerboard squares of the interweave pattern each can be made large enough to be seen by the naked eye.