Elimination of distortions which occur when converting interlaced deflection into progressive one in digital television

Converting deflection in television in most cases is down to changing the parameters of the discrete sampling through time (changing the frame rate and the fields). The use of digital technology has made it possible to perform various kinds of deflection converting. The conversion of interlace deflection into progressive one is of great importance for improving the image quality. This problem is particularly acute in digital television while reducing spatial and temporal redundancies from the TV picture, but when two fields are superimposed to form a single frame, one shall have appreciable distortions of moving objects in the frame space (the effect of «comb» and «blinds» type), which, unfortunately, not always can be eliminated. The need for such a conversion is associated with an increase in the efficient removing of redundancy from TV reports. For example, when an object, the black square on a white background, moves in the vertical direction there also occurs a distortion, but of a different nature: the square is stretched vertically, turning into a rectangle, with thereof top and bottom becoming discharged in density due to a mismatch of horizontal borders (distortion of «jalousie» type). That is, there is a distortion not only of the shape of the object, but also of its content. The problem of removing the specific distortion of the «comb» and «blinds» type and an additional reduction of the digital video stream when converting interlaced deflection into progressive one remains relevant today. To solve the problems mentioned above, a comparative analysis of the gained conversion results has been conducted and the structural scheme has been developed.