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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 4562467 | Data compression apparatus and method for encoding and decoding multi-line signals Apparatus and method for encoding and decoding a signal which is divided into a plurality of signal lines, each of which is a successive line of pixel signal values taken from a two-dimensional informational field. The apparatus for encoding includes the ... | 12/31/1985 |
| 4562466 | Digital data transmission/reception having adaptive error control A conditional replenishment video data transmission system involves the transmission of updating digital data for clusters of consecutive picture elements, all or most of which show a change since the previous frame, in lines of a raster over an image to ... | 12/31/1985 |
| 4558350 | Vector quantizer A vector quantizer receives a plurality of input signals in block form and operates to determine an output vector having the least distortion with respect to an input vector by various techniques. A coded output or output vector codetable address is outpu... | 12/10/1985 |
| 4533957 | Method of processing picture signal to increase average run length and apparatus therefor A prediction error signal and a prediction state signal are generated for each of a plurality of picture elements (or bit planes or gray codes) to be encoded. The picture error signal is based on a plurality of previously encoded picture element data (or ... | 08/06/1985 |
| 4529839 | Multilocation video conference terminal including an arrangement to reduce disruption in video switching In a Multilocation Conference Terminal (MLCT), disruptions in the video being viewed which are caused by switching from one conference location to another are minimized by delaying switching of the video signal until a so-called get ready control signal i... | 07/16/1985 |
| 4494140 | T.V. apparatus for movement control A video processing system for reducing data content requirements along a transmission path. A movement processor which includes a framestore is capable of detecting both interfield and interframe movement and uses this to manipulate the data so as to inhi... | 01/15/1985 |
| 4491953 | Dual mode coding A dual mode encoding/decoding technique for use in digital systems wherein transmitted digital words are limited, on average, to an alotted number of bits. The transmitted digital words are coded into first and second modes. The first coding mode utilizes... | 01/01/1985 |
| 4488174 | Method for eliminating motion induced flicker in a video image In an image processing system, a method is shown for efficiently transmitting data representing picture information in fields subsequent to a first field and for suppressing motion induced flicker in the processed image. Using previously processed first f... | 12/11/1984 |
| 4477915 | Differential pulse code modulation transmission system Differential pulse code modulation transmission system comprising a transmitter and a receiver. In the transmitter there is subtracted from an information signal x(n) to be transmitted, a prediction signal y(n) for the purpose of generating a difference s... | 10/16/1984 |
| 4468708 | Combined data rate reduction system A method and apparatus are disclosed for performing a reduction of the data rate of a data stream for transmission through a transmission channel or recording and for subsequently reconstructing the original data stream upon receipt or during reproducing.... | 08/28/1984 |
| 4435726 | One shot predictor for mixed mode documents A predictor bit pattern comprising selected bits of the current and previous raster scan lines and a method of predicting a plurality of bits per clock are disclosed. Generally, a predictor is used prior to the encoding of data to increase the compression... | 03/06/1984 |
| 4430670 | Reconstruction of quantized DPCM or PCM signals DPCM or PCM samples which have been quantized at a transmitter are assigned a representative value associated with one of a plurality of mutually exclusive quantization levels, each having predefined upper and lower limits. The sample values are reconstru... | 02/07/1984 |
| 4420771 | Technique for encoding multi-level signals A series of words each representing one of at least M (Mࣙ3) different values is encoded by grouping the words into alternate runs of (1) a first, frequently occurring value, and (2) all other values. A coded representation of each run length as well as ... | 12/13/1983 |
| 4402010 | Digital television signal processing and transmission system An input signal source of any form (e.g. camera or recorder) supplies a standard base band video wave. This video signal is fed to a conventional analog-to-digital converter (11) which samples the incoming wave train at a rate of 8 megahertz under the con... | 08/30/1983 |
| 4369464 | Digital video signal encoding and decoding system The system encodes a high rate digital video signal conveying picture elements into a low rate digital signal conveying words representative of some picture elements. The system comprises a frame store, a movement detector for detecting the movement area ... | 01/18/1983 |
| 4363103 | Device for following and estimating the local state of picture contours A device for following and recursively estimating the local state of pict contours defined by lines of N points distributed in accordance with an orthogonal sampling structure, said points being defined by successive numerical samples. The invention also... | 12/07/1982 |
| 4334246 | Data decompressor circuit A circuit and method for decompressing video subsequent to its prior compression for transmission or storage. The circuit assumes that the original video generated by a raster input scanner was operated on by a two line one shot predictor, coded using run... | 06/08/1982 |
| 4281344 | Video interframe transform coding technique The efficiency with which a video signal is encoded is increased by examining successive blocks of M picture elements to determine which K pels have frame differences which do not exceed a predetermined threshold. The values of these K pels are intentiona... | 07/28/1981 |
| 4255763 | Technique for reducing transmission error propagation in an adaptively predicted DPCM video encoder Propagation of transmission errors in adaptively predicted, DPCM encoded video signals is reduced by including a leak circuit (114) in the encoder (FIG. 1). The leak circuit modifies each prediction in response to local characteristics in the area of the ... | 03/10/1981 |
| 4237484 | Technique for transmitting digital data together with a video signal Supplementary digital data is encoded together with a video signal by predicting the intensity values of a first set of video samples, compressing the range of the prediction errors and superimposing a value indicative of the supplementary data on the com... | 12/02/1980 |
| 4200886 | Method for transmitting video signals with the aid of DPC modulation and controlled quantizer A method for transmitting video signals by differential pulse code modulation employing an adjustable quantizer which can be switched between different quantizing characteristics, by deriving the control criterion for switching the quantizer from the quan... | 04/29/1980 |
| 4193092 | Image interpolation system Analog image data pixels are sampled and held to produce a box car wave representative of the image data. Wave height differences are bridged by linear interpolation, with frequency enhancement imposed at the bridge junctures. The modified image wave is t... | 03/11/1980 |
| 4193096 | Half tone encoder/decoder A system for compressing or compacting scanned image data is disclosed. The system electronically subdivides the image data pixel pattern into quadrants and predictively encodes pictorial data by predicting, from the established image values of adjoining ... | 03/11/1980 |
| 4185303 | Run length encoding of facsimile pictures A series of bits which represent the intensity values of elements of a facsimile picture are preprocessed to eliminate runs of length one, and then applied to a predictive encoder which treats values for alternate pels in two distinct ways. Specifically, ... | 01/22/1980 |
| 4173771 | High speed predictive encoding and decoding system for television video signals A high speed predictive encoding and decoding system for frequency band compression of television video signals has a transmitting unit and a receiving unit coupled by a transmission link for transmitting a video signal produced through a repeated horizon... | 11/06/1979 |
| 4163257 | Spatial toner for image reconstitution An apparatus is described which is responsive to a sequence of received data-compacted pixels representative of a coarse two-dimensional image of a remote scene for reconstituting picture point intensity signals representative of the smoothly shading in o... | 07/31/1979 |
| 4158856 | Apparatus and method for generating digital words representative of video information A technique for converting video information into sequences of digital words in a form which can be readily accepted by a computer. The generated digital words exclude some information content of the video signals which is not necessary for certain patter... | 06/19/1979 |
| 4125861 | Video signal encoding When a video signal is encoded using differential pulse code modulation (DPCM) techniques, the frequency of occurrence of the various quantizer output or representative levels is non-uniform; usually, low levels occur more frequently than high levels, and... | 11/14/1978 |
| 4099122 | Transmission system by means of time quantization and trivalent amplitude quantization Indicated as hybrid D-PCM a new transmission system is given which is based on differential pulse code modulation (DPCM) with signal compression at the transmitter end and signal expansion at the receiver end. In the transmitter defined auxiliary information i... | 07/04/1978 |
| 4077053 | Television signal encoder utilizing a correlation between frames A television signal encoder uses correlation between frames for data compression or reduction in redundancy of information to be transmitted. The coding error occurring in the interframe coding process is effectively corrected by low-bit intraframe coding... | 02/28/1978 |
| 4054909 | Method and system for bandwidth-compressed transmission of a video signal in the NTSC system Bandwidth-compressed transmission of an NTSC-type video signal is performed by converting the analog composite NTSC signals to digital signals and then orthonormally transforming the digital signals corresponding to each horizontal line period of the comp... | 10/18/1977 |
| 4051530 | Frame-to-frame coding system An input video signal is fed to a substracter wherein a difference is taken between the input and the output from a frame memory to provide a difference signal, the magnitude of which is controlled by a magnitude adjuster. The controlled output is then fe... | 09/27/1977 |
| 4027331 | Digital television system A digital transmission system for television signals in which signals are transmitted only in respect of picture elements which differ from those in the preceding frame, the signals being in differential pulse code modulation form and means is provided fo... | 05/31/1977 |
| 4005411 | Compression of gray scale imagery to less than one bit per picture element In a continuous tone image approximated by a two-dimensional array of gray scale coded points, more than one bit per picture element is required. Compression coding consists firstly of delta coding sequences representative of the successive scan lines of ... | 01/25/1977 |
| 3962535 | Conditional replenishment video encoder with sample grouping and more efficient line synchronization A video sample is selected for transmission only if it differs significantly in amplitude from the sample corresponding to the same spatial point in a previous video frame. An address word which indicates by its value the position of a sample within a vid... | 06/08/1976 |
| 3940555 | Picture signal transmission system A picture signal transmission system for transmitting after coding a picture signal obtained by scanning at least one picture to be transmitted, in which a difference between a representative level value of each picture element unit formed by at least one... | 02/24/1976 |
| 3937871 | Code communication A method and apparatus for code communication is disclosed in order to achieve band-width compression. Successive portions of information are derived and the next portion of information is predicted from at least one preceding portion, an error signal is ... | 02/10/1976 |
