Abstract: A video-apparatus comprises histogram modification means to match at least luminance signals (Y) for separate pixels to prescribed values. The histogram modification means comprises a first memory (3) with a first look-up table to correct the video luminance signals (Y), while a second memory (4) with a second look-up table is provided, the values within the second look-up table (4) being derived from the values in the first look-up table (3) and being applied to correct the color-difference signals (U and V). Preferably, in order to obtain a distribution of a rounding-off error over a pixel's neighbor, each of the channels for the luminance (Y) and color-difference signals (U and V) comprises a closed lsb (least significant bit) correction loop (14, 14′) with a quantizer (15, 15′) and a pixel memory (16, 16′), the input of the lsb correction loop being formed by the corrected luminance and corrected color-difference signals respectively.

Abstract: A video-apparatus comprises a circuit for reducing noise in the video signals. The noise reducing circuit is provided with a temporal noise filter (S1, LUT, M), a down-sample unit (D) for obtaining a spatial down-sampling of video signals (Vi) of subsequent pixels, which down-sampled video signals are supplied to the temporal noise filter (S1, LUT, M), and an up-sample unit (U) to generate, in response to noise output signals obtained in the temporal noise filter (S1, LUT, M), noise signals of the pixels, and a subtractor (S2) to subtract the noise signals from the respective input video signals (Vi).