Abstract: A process and apparatus for generating a deinterlaced digital output image from a plurality of sequential interlaced image fields processes selected ones (a pair of immediately successive fields of the same polarity) of the plurality of sequential interlaced image fields, so as to produce a global motion vector estimate of global translational motion between the selected image fields. An accuracy map representative of accuracy of motion compensation is then generated in accordance with the global motion vector estimate. An adaptive deinterlacer selectively deinterlaces one of the image fields in accordance with the accuracy map. The selectively deinterlaced image field is subjected to postprocessing in order to remove judder artifacts that may be present in the deinterlaced image field as a result of a misclassification of the global motion vector estimate as being accurate in one or more image regions of the deinterlaced image field.

Abstract: Method and apparatus are disclosed for deinterlacing of an interlaced video frame sequence using interpolation estimations, such as spatial and temporal interpolations. Interpolations requiring a less accurate estimation of missing pixel values in the frames being deinterlaced, such that an interpolation may be performed with a minimum of error, are performed before interpolations which require a more accurate estimation of missing pixel values for performing an interpolation, such that estimates of missing pixel values are obtained with a minimum of error. Interpolation estimations are weighted in combination for computing approximations of missing pixel values in accordance with the errors associated with the respective interpolations.

Abstract: A system and method for removing motion artifacts from an interlaced image is disclosed. The interlaced image comprises an odd and an even field. The system and method includes providing one of the odd and the even fields on every other line of the display and then providing a set of constant signal level lines to the remaining lines of the display. The method and system further includes shifting the location of the constant signal levels lines by a scan line responsive to a timing signal from the display, and providing the other of the odd and the even field to the display responsive to the shift.

Abstract: A scan converting apparatus receives an NTSC signal which is scan converted and which has a changed aspect ratio. The subtitle domain, which is vertically overscaned out of the screen and cannot be observed, is extracted and superimposed on the scan converted image. Scanning lines of a brightness output signal of a brightness/chrominance signal separator are interpolated at a scanning line interpolator and are converted to a system which has more scanning lines at a scanning line converter. An odd/even field discriminator prevents deterioration of the resolution of the subtitle letters which is caused by an interchange of the positions between two adjacent scanning lines when the subtitle is transferred to a different field. By stopping the writing of data to a field memory in the subtitle signal processor when a subtitle is transferred, a subtitle transfer can be accomplished even when there is no subtitle on the image.

Abstract: A method for processing video data to produce a progressively scanned signal from an input of conventional interlaced video. The data is received at a processor (1), used to determine a motion signal (26) over time between field of the data. The motion signal is filtered to reduce errors caused by noise-corrupted video sources and then further filtered to spread out the determined motion signal. Edge information (30) is located and combined with the motion signal to produce an integrated progressive-scan signal (36) for display on a video display device, producing images with sharper edges and motion signals which have a lower susceptibility to noise.

Abstract: An image reproduction apparatus which converts a sampling frequency from a first frequency to a second frequency, performs interfield interpolation at a third frequency, and converts the sampling frequency from the third frequency to the first frequency, wherein the interfield-interpolation is performed at the first frequency between signals one field apart from each other. The apparatus also converts a number of vertical scanning lines to convert a high definition TV signal of the MUSE format to a signal of NTSC format, sets a scanning period used in the vertical scanning line conversion, and generates a coefficient used in the vertical scanning line conversion.

Abstract: A device for converting image signal frame format including a motion compensator for restoring image signals by carrying out motion compensations employing motion information, variable length decoding, inverse multiplex conversion, displaced frame difference, inverse quantization, and inverse discrete cosine conversion. A first frame ratio convertor is used for classifying areas by pixels and converting frame ratios of image signals received from the motion compensator according to the classified areas. The device provides users with the advantage of natural display pictures having good picture quality by carrying out classification of the corresponding pixel areas and subsequent interpolation utilizing various informations applied from an image signal decoder.

Abstract: A motion detection circuit within MUSE decoder for reproducing a high definition television picture signal from a MUSE signal obtains one-interframe differential signal and preferably one-interfield differential signal from an interframe interpolation signal. The differential signals are passed through a vertical filter to limit the vertical frequency and through a horizontal filter or filters to obtain a high and a low frequency component signal. The judgment circuit judges the reliability of the high and low component signals on the basis of the levels of peak values thereof, and the selector selects an appropriate signal in accordance with the judgment. Horizontal and vertical width extenders and absolute value output circuits may be provided to improve the performance.

Abstract: An interpolating component generator for a scanning line interpolator using pseudo median filters wherein in generating an interpolating component signal required for converting an image signal of the interlaced scanning system into an image signal of the progressive scanning system, a determination is made whether an inter-field variation is larger than an intra-field variation, based on a determination signal from an inter-field/intra-field determination processor so that an intra-field pseudo median filter is used when the inter-field variation is larger than the intra-field variation, whereas an inter-field pseudo median filter is used when the intra-field variation is larger than the inter-field variation, so as to calculate a pixel value to be finally used in interpolation, thereby solving problems such as a step edge phenomenon and a reduced vertical resolution encountered in fixed intra-field or inter-field interpolation systems, an overlap phenomenon occurring in median filters, arid an increase in c

Abstract: A scan converting apparatus receives an NTSC signal which is scan converted and which has a changed aspect ratio. The subtitle domain, which is vertically overscaned out of the screen and cannot be observed, is extracted and superimposed on the scan converted image. Scanning lines of a brightness output signal of a brightness/chrominance signal separator are interpolated at a scanning line interpolator and are converted to a system which has more scanning lines at a scanning line converter. An odd/even field discriminator prevents deterioration of the resolution of the subtitle letters which is caused by an interchange of the positions between two adjacent scanning lines when the subtitle is transferred to a different field. By stopping the writing of data to a field memory in the subtitle signal processor when a subtitle is transferred, a subtitle transfer can be accomplished even when there is no subtitle on the image.

Abstract: Television signal processing apparatus act on a received standard-bandwidth television signal to produce a high-definition-like video image relatively free of artifacts. A motion-adaptive line doubler operates in combination with a non-linear enhancer. In a practical implementation, the combination further includes a digital decoder. When the output of the decoder is applied to the line doubler, an interface provides a transition from the time base of the decoder to the time base of the line doubler. The non-linear enhancer includes bandwidth expanding enhancement for horizontal and/or vertical picture transitions.

Abstract: For obtaining motion information by using a conventional motion estimator, a composite signal obtained from both the luminance signal and the chrominance signal is applied to this motion estimator. Based on the signals (Cb, Cr) of the two chrominance components (U, V), the contour of the colored elements of the image is extracted by means of Sobel filters (9, 10), i.e. high-pass two-dimensional filters, and the output signals of these filters are added to the luminance signal (2) in an adder (14), the resultant signal (3) being applied to the motion estimator.

Abstract: For a digital television including an analog/digital converter for converting interlaced scanning video signals into digital video signals, a motion compensating system comprises a color/brightness signal separator for separating the signal and the brightness signal of said digital video signal from each other; a picture transition sensing stage for detecting the amount of the horizontal and time motion of the picture by said brightness signal and the amount of the vertical transistion of the picture by said digital video signal to compare and compensate the two amounts, obtaining the signal of sensing the amount of the motion of the picture; and a mixer for interpolating the color signal, the brightness signal of the color/brightness separator and compensating the interpolated color signal and the brightness signal and the present color signal and the present brightness signal with the signal of the sensed amount of motion of the picture generated by the picture transition sensing stage.