Abstract: Video data is processed according to grid-based characteristics. According to an example embodiment of the present invention, regions of an image centered on a horizontal and/or vertical grid are identified. For each of these regions, video data representing central sub-regions therein is filtered to mitigate blocking artifacts. These approaches may be carried out upon regions including a block of pixels, with central sub-regions including a centrally-located pixel and other pixels adjacent thereto. These approaches may also be carried out on video data such as a compressed bitstream, with aspects of the grid identification and filtering based on one or both of the compressed bitstream and decoded data therefrom.

Abstract: The present invention is directed to a method of processing a video signal. The method includes the video signal being split into a low frequency signal and a high frequency signal. The low frequency signal being processed to reduce ringing artifacts. The high frequency signal being processed to reduce blocking artifacts. Further, the low frequency signal and high frequency signal being combined.

Abstract: Image information is stored into a memory device (FMORG) which is controlled in such a manner that only image information from a movement phase different from the movement phase of the image information already stored in the memory device (FMORG), is stored into the memory device (FMORG), whereby the memory device (FMORG) provides image information from a movement phase which differs from a movement phase of the image information by a fixed number of movement phases, even when the image information contains repeated movement phases.

Abstract: In a noise reduction filter having a filter coupled to receive a plurality of input signal samples (.smallcircle.,.sym.) and furnishing noise-reduced signal samples, and a delay circuit coupled to the output of the filter and which furnishes a plurality of delayed noise reduced signal samples (X) to a further input of the filter, the samples (Pn.sub.1 . . . Pn.sub.n) applied to the filter are not directly neighboring samples.

Abstract: In a method of measuring noise in image signals, a number of noise estimates (SAD) is calculated (1). Subsequently, it is determined (3-9) which noise estimation interval [A, B] out of a plurality of predetermined noise estimation intervals [A, B] contains at least a predetermined number of noise estimates (SAD) and has at the same time the lowest upper interval boundary. The output noise measurement value depends on the determined noise estimation interval.

Abstract: In a motion-compensated picture signal interpolation apparatus comprising switched memories (SMX,LM) for furnishing motion-compensated pixel values corresponding to at least two motion vectors (.+-.d, 0), the motion-compensated pixel values are processed by an ordered statistical filter (MED).

Abstract: In a method of converting an interlaced video signal (IS) into an output sequentially scanned video signal (SSS), a first sequentially scanned video signal (SS1) is furnished in dependence upon the interlaced video signal (IS). Subsequently, a motion-compensated sequentially scanned signal (MCS) is furnished in dependence upon the first sequentially scanned video signal (SS1). All video lines of the output sequentially scanned video signal (SSS) are furnished in dependence upon both the first sequentially scanned video signal (SS1) and the motion-compensated sequentially scanned signal (MCS) to prevent inaccuracies in motion vectors used in the motion-compensated processing operation (5-9) from resulting in visible distortions.

Abstract: In a motion-compensated picture signal interpolation apparatus comprising a field memory (FM2) for delaying an input field sequence, a motion vector estimator (ME) for furnishing motion vectors, and a motion-compensated interpolator (MC) coupled to an input and an output of the field memory (FM2) for furnishing a sequence of motion-compensated output fields on the basis of the motion vectors, inputs of the motion vector estimator (ME) are coupled to the input and the output of the field memory (FM2) to estimate the motion vectors by means of the same single field memory (FM2) which is used for the motion-compensated interpolation. (FIG.

Abstract: In a method of controlling a picture signal processing mode, first and second motion vectors are determined (ME, D.sub.T) for first and second fields, and a picture signal processing mode control signal is obtained by comparing (D.sub.T, -, COMP-R) the first and second motion vectors. The control signal may be transmitted along with, for example, a HDTV signal to give an indication to a TV receiver whether the signal originated from movie-film or from non-movie-film or be generated within the receiver.