Abstract: In each of stages of a nonlinear filter, a successively determined target signal and plural adjacent signals are weighted-averaged with plural sets of different coefficients to calculate plural smoothed signals. Differences in level between the target signal and each of adjacent signals and signals arranged within the predetermined interval from the each of the adjacent signals are compared with a threshold value. According to the comparison, flags are set to the adjacent signal, to an adjacent signal arranged at a symmetrical position, and to adjacent signals arranged beyond the adjacent signals. The intervals of adjacent signals are different among stages. The target signal in level is used instead of the adjacent signals with smoothed signals, which are selected according to the flags. Weighting coefficients may be calculated on the basis of the comparison result, and smoothed signals may be synthesized according to the weighting coefficients.

Abstract: An input signal is accurately separated into a component in which a change in signal level is sharp and having a large edge, and the other components.

Abstract: A video processing apparatus includes a selection means (14) for selecting a video signal constituting a main screen and a video signal constituting a sub-screen, a first video processing means (16, 18) for processing the video signal for the main screen selected by the selector, a second video processing means (17, 19) for processing the video signal for the sub-screen selected by the selector, a synthesizing means (20, 21, 22) for setting a video signal obtained when the main screen and the sub-screen are synthesized in one screen by using the video signal processed by the first video processing means and the video signal processed by the second video processing means, and a controller (31) for, when the video signals of the main screen and the sub-screen selected by the selection means are the same video signals, performing control for setting a video signal obtained when the main screen and the sub-screen are synthesized in one screen by using only the video signal processed by the first video processing