A system for encoding and decoding a color video signal wherein information obtained from the luminance component is used to reduce the amount of color information which must be sent from encoder to decoder. In the encoder, at least two different predictions are made of the present luminance sample, based upon individual or combined values of the previous luminance samples. Each prediction is evaluated against the true luminance value, to determine the best predictor pattern or strategy. If good...

PAL color television signals are processed in the form of a luminance signal Y and a composite chrominance signal consisting alternately of U + V on one line and U - V on the next. The composite chrominace signal is sampled at a frequency substantially equal to the PAL color subcarrier frequency and the luminance signal is sampled at the sub-Nyquist frequency of twice the color subcarrier frequency. Comb filters are included to remove undesired aliasing effects. The signals can be received in Y,...

A compatible high-definition television system may be achieved by dividing a standard picture element into four arranged sub-picture elements arranged in a parallelo-grammatic fashion. In the system a sum signal which is the sum of the four sub-picture elements is transmitted as a standard luminance signal. Further, the system includes means for computing three difference signals and transmitting these in separate channels. The first difference signal is the horizontal difference signal, the sec...

A remote television viewing system employing an eye tracker is disclosed, wherein a small region of the image appears in high resolution, and the remainder of the image appears in low resolution. The eye tracker monitors the position of the viewer's line of sight. The eye tracker position data is transmitted to the remote television camera and control. Both the remote camera and television display are adapted to have selectable high-resolution and low-resolution raster scan modes. The position d...

A high definition television transmission system in which a wide band interlaced television signal (FIG. 2) having 1249 lines per field is divided to provide first and second interlaced television signals each having 625 lines per field and consequently reduced bandwidth. Adjacent lines of the first television signal have their low frequency information (0-3 MHz) (FIG. 2) derived from alternate lines in the wide band signal while the corresponding information for adjacent lines in the second tel...

The disclosure is directed to an apparatus and method for encoding and/or decoding video signals for use in a compatible high definition television system or in other applications. In a form of the disclosure there is provided an encoder which includes means for storing an input frame as an array of digital pixel values, and means for interrogating the stored array and for generating a sum signal and at least one difference signal. The sum signal is representative of the sum of the pixel values ...

The full potential of high resolution television by synchronized modulation of the scan lines at the camera and display unit is achieved in standard transmission through band limited channels by: separating out of the video signal from the television camera the modulation frequency as sidebands with pixel information, for example 7.16.+-.1/2 MHz in the case of a color subcarrier at 3.58 MHz under the NTSC standards and pixel information modulated on sidebands in a narrow band (about .+-.1/2 MHz)...

A method for receiving a high definition television signal has been used by the band-splitting and sub-sampling method. The concrete embodiment for the method can be accomplished by converting the received radio frequency signal into a first intermediate frequency signal, and by splitting a second intermediate frequency signal and a narrow band intermediate frequency signal therefrom. The narrow band intermediate frequency signal is lacked a given fixed frequency to demodulate the second interme...

A method of color image compression processing provides compensation for lossy luminance compression (30) by adjusting (34) the red and blue color components using a lossy luminance compression factor equal to the difference between compressed and decompressed luminance. The compensated color components are then used to compute (42) chrominance color differences. Chrominance is range compressed (44) by bit-reduction using a non-linear range compression function that minimizes compression for sma...

A compressing apparatus for compressing color image data including R, G and B data. The apparatus includes a converter for converting the R, G and B data into luminance data and chrominance data, and an encoder. The encoder encodes the luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive, such as, e.g., in dark or bright areas. The encoder also encodes the c...