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WO/1992/003017A1 |
In letterbox colour television systems, additional data must be transmitted in the most compatible possible manner. However, additional crosstalk effects and, in known television receivers, synchronization disturbances can occur. If the ...
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WO/1992/003019A1 |
A method of processing digital image data such as obtained from a television screen for transmission along telephone lines such thtat the transmitted data can be transformed to produce images in colour. The method includes storing a fram...
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WO/1992/000652A1 |
A color imagery compression/decompression mechanism employs a contrast sensitivity function model of the human visual system for color images, to derive normalization values for compressing chromatic components of the color imagery data....
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WO/1991/020158A1 |
Digital samples of an HDTV video signal are compressed by determining groups each of three successive samples in the video signal lines, the groups in adjacent lines being offset from one another, and transmitting only a first sample in ...
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WO/1991/020159A1 |
The amount of high frequency variation, horizontally and/or vertically, which is in a video image is evaluated by processing a video signal representing the image so as to produce a lower definition version thereof, reconstructing the vi...
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WO/1991/019397A1 |
A video display system comprises a first video signal source (304) of a first picture and a second video signal source of a second picture. A first signal processor (304) speeds up the first video signal. The second video signal (306) is...
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WO/1991/019393A1 |
A two stage interpolation system provides greater bandwidth for signals compressed and expanded by interpolation, such as video signals displayed in a zoom or enlarged mode. A finite impulse response filter (391) generates from a first s...
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WO/1991/019386A1 |
A picture overlay system assures proper size and placement of picture overlays in simultaneous picture displays. The system comprises a video memory (350, 356, 358) and a control circuit (300) for writing and reading information from a v...
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WO/1991/019399A1 |
Video luminance data from a video signal is selectably compressed and expanded in a first signal path including a first line memory (356). A second line memory (358) in a parallel signal path processes video chrominance data from the vid...
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WO/1991/019380A1 |
The perceived quality of a dithered or dithered/dedithered video signal can be improved under some circumstances by skewing the dither sequence. The dither sequence, whether a 1-bit or 2-bit sequence, repeats continuously on a given line...
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WO/1991/019388A1 |
A video display has a first format display ratio. A mapping circuit maps an adjustable picture display area on the video display. A signal processor generates first and second video signals from input video signals having one of differen...
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WO/1991/019400A1 |
A dither signal is added to an n-bit video signal. The adder (376) should include a limiter to avoid overflows. The samples are truncated after the addition. The least significant two bits are simply discarded. A dither signal which can ...
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WO/1991/019385A1 |
First and second field type detectors (702, 710) for first and second video signals have outputs indicating whether the video signals have first or second field types. The first video signal is synchronized with the second video signal f...
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WO/1991/019381A1 |
A line memory and control system comprises a line memory (356, 358) for example a first in first out (FIFO) device. A comparator (1102) compares a first value (P), specifying a location in the horizontal line period where reading or writ...
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WO/1991/019394A1 |
A circuit for compressing and expanding video data comprises a FIFO line memory (356) and an interpolator (337). A timing circuit (339) generates control signals for writing data into the line memory (356) and for reading data from the l...
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WO/1991/019384A1 |
A wide screen television apparatus comprises a video display (244) having a first format display ratio of width to height, for example approximately 16x9. A first video signal defines a first picture. A second video signal defines a seco...
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WO/1991/019387A1 |
A picture overlay system assures proper image aspect ratios for picture overlays. The system comprises a video memory (350, 356, 358) and a control unit (300) for writing and reading information from a video signal into and out of the vi...
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WO/1991/019398A1 |
A circuit for compressing and expanding video color component data comprises a FIFO line memory (358) and a delay circuit (540). A timing circuit (339) generates control signals for writing data in the line memory and for reading data fr...
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WO/1991/019395A1 |
A video display system comprises analog to digital converters (342, 346) for quantizing first and second video signals, representing first and second pictures respectively, at higher and lower levels of quantization resolution relative t...
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WO/1991/019378A1 |
A display system controls vertical zoom and panning. A video display has a first format display ratio. A circuit (30), for example one generating a raster, maps on the video display an adjustable picture display area represented in a vid...
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WO/1991/019379A1 |
A field synchronization system for asynchronous video signals, comprises a video display synchronized with a first video signal having a first line rate component and a first field rate component. A second video signal having a second li...
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WO/1991/019390A1 |
A video control system comprises a deflection system having a dimensionally adjustable raster, a circuit (1032) for detecting a letterbox video signal source and a circuit (50) for dimensionally controlling the raster of the deflection s...
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WO/1991/017646A2 |
In the case of telefax, coding was carried until now on the basis of the run length principle, i.e. all image points of the same colour are digitally sensed until a change occurs and coded according to the MHC process. The transmission i...
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WO/1991/017629A1 |
In the process described, original images are divided for image-data transmission purposes into zones and, for each zone, transformation data prepared and/or motion vectors determined in accordance with a modification criterion. For tran...
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WO/1991/015929A1 |
A method and an apparatus are set forth for encoding and decoding video to achieve bandwidth compression. In one form of the disclosure, two video signals (810, 850), representative of different images, can be transmitted using only the ...
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WO/1991/015085A1 |
When transmitting television signals with a 4:3 picture format for reception on a standard receiver and additional information, which may consist of additional lateral picture portions produced in the transmitter, for a 16:9 picture form...
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WO/1991/014346A1 |
In the letterbox colour television system, additional data are transmitted with an appreciably reduced amplitude for reasons of compatibility, low frequency components having a relatively high amplitude. This results, however, in a reduc...
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WO/1991/014342A1 |
A method of compressing an original signal which is converted into a plurality of binary signal vectors. Each signal vector contains a plurality of data elements of the original signal being compressed. The method includes the step of ha...
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WO/1991/012696A1 |
In order to demodulate SECAM-coded colour-TV signals with a line-coupled cycle, a phase-stable colour carrier is first multiplied, in a first phase-control circuit, with a chrominance signal which is to be demodulated and then fed to a l...
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WO/1991/011882A1 |
In letter-box colour television system additional information is transmitted at a markedly reduced amplitude for reasons of compatibility. This however also reduces the ability to make full use of the maximum attainable channel capacity ...
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WO/1991/010329A1 |
A system for synchronizing first and second (A) video signals which are to be combined is disclosed. The second signal is a time compressed digital signal containing macro blocks (B) of composite data preceded by a field sync flag (SF) s...
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WO/1991/010326A1 |
Methods to reduce the quantization error in the higher spatial resolution digital image signals of a hierarchical decomposition and reconstruction scheme are disclosed. The quantization errors in the high spatial resolution digital image...
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WO/1991/009499A1 |
TV signals, for example HDTV picture signals, are distributed within or between TV studios, using a transmission rate, for example 560 Mbit/s, which is less than the data rate of the picture signal used, for example 886 Mbit/s. To this e...
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WO/1991/008546A1 |
The image compression method consists in processing a current frame of pixels displaced in the image to be compressed by using a network of N neurons, 1 through N, arranged in a same plane, each neuron having a number of inputs equal to ...
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WO/1991/008648A1 |
An image processing method is described for the hierarchical storage and display of high resolution digital images in a multiuse environment. The method makes reduced resolution versions of the original image available to quick display o...
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WO/1991/007852A1 |
In order to prevent phase errors in the transmission of a colour television signal in time and frequency multiplex without taking account of image interference, a reference signal is inserted during image generation in at least one line ...
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WO/1991/007847A1 |
According to the main application P 38 31 103, the HDTV signal is divided into two signal components, whereby the first is a standard TV signal and the second is a spatial high-resolution and temporal low-resolution HDTV signal. An impro...
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WO/1991/007846A1 |
A method for modulation and demodulation of multiplexed color picture signal is disclosed to increase resolution in the vertical direction by means of 2-line array of CRT cathode which produce 2-line of electron beam. The horizontal reso...
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WO/1991/007840A2 |
In a method for creating a scan sequence for a single chip color camera an analysis of typical images, captured through a color filter array, is performed to determine an optimal scan sequence for the particular array and/or the typical ...
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WO/1991/007049A1 |
In a TV transmission system which operates on the ''letter box'' principle for the 16:9 image format, every fourth line is removed and transferred as additional information to the upper and lower edges of the image, in a form compatible ...
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WO/1991/007054A1 |
Being discussed at present is the so-called 'letter-box' method for the insertion of a 16:9 wide-picture format into existing standard systems (e.g. PAL, SECAM, NTSC) in 4:3 format. Format information is transmitted as auxiliary data in ...
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WO/1991/007062A1 |
In a widescreen signal encoding system for a television-type signal, side panel chrominance information (45, 46) is not subjected to time compression in an overscan region such as a horizontal overscan region containing time compressed (...
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WO/1991/007063A1 |
In a widescreen signal encoding/decoding system for a television-type signal, side panel chrominance information (I, Q) is conveyed (45, 46, 55) in double sideband form on an auxiliary subcarrier (ASC) having a field inverting phase rela...
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WO/1991/005439A1 |
An image signal (V1) is transform coded in a Discrete Cosine Transform Coder (DCT) and the output coefficients thus provided are encoded in a zonal encoder (QZ). The output of QZ is inversely coded (IQZ) and substrated from the coefficie...
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WO/1991/005441A1 |
Blurring along edges between regions of different color characteristics in interpolated color images is avoided by a signal processing technique that segments the fully sampled channel into a plurality of contiguous image regions of resp...
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WO/1991/005440A1 |
Color fringing of edges between regions of different color in an interpolated image is effectively avoided by a signal processing technique that infers the existence of a color edge in response to prescribed changes in image characterist...
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WO/1991/004637A1 |
In television transmission systems which use the 'letter-box' technique, an active 16:9 format image is transmitted within a 4:3 image format. This does not, however, overcome the disadvantages of interlaced scanning (e.g. line shake, ed...
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WO/1991/003906A1 |
In a TV transmission system which operates on the ''letter box'' principle for transmitting the 16:9 aspect ratio, every fourth line is removed and transmitted in a compatible form as additional information at the upper and lower edges o...
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WO/1991/003131A2 |
A convergence control system for multiple vertical modes or formats, having respective rasters with different vertical heights, comprises a selector (4) for initiating operation in one of the available vertical modes, and a circuit (40) ...
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WO/1991/002431A2 |
Apparatus for augmenting a television signal with auxiliary signal includes circuitry for modulating a picture carrier with baseband video signal to generate a vestigial sideband television signal. Auxiliary signal (54) is modulated on a...
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