Motion adaptive field rate upconversion algorithms for 900 lines/100 Hz/2:1 displays

An algorithm for motion adaptive field rate upconversion is described. It applies one of two low-pass vertical filters to the source signal, depending on whether the source is moving or static. The theory justifying this approach is also presented. In the case of high-definition multiplexed analog component (HD-MAC) signals, the motion adaptive control can be derived from the transmitted digitally assisted TV data, while for existing standards a motion detector is required. An algorithm for motion detection is also described. To improve the quality of moving images, an additional median filtering algorithm that can be applied after the vertical filtering is presented. The display standard of 900 lines, 100 Hz/2:1 is presented as an engineering compromise, allowing the construction of 100-Hz displays using conventional techniques while avoiding any compromise of the displayed image quality. A motion adaptive field rate upconverter has been constructed that converts either 1250- or 625-line 50-Hz inputs for display at 900 lines, 100 Hz. Initial tests have shown that the concept of a high-quality receiver, as described in the text, is valid in terms of image quality