Abstract: The present invention provides systems, methods, and computer program products for performing color gamut mapping between different color gamuts on a pixel basis. A set of desired parameters is initially defined representing the desired color gamut transformation to which the color values of the pixel are to be mapped. The parameters describe the best-fit lines for the portions of the curve for the gamut transform to which the specific parameters are applied. The present invention next maps the color values used for the pixel in the first color gamut and the color values used for the pixel in the second gamut to the parameters of the transform. The present invention performs mapping by isolating portions of a curve and approximating those portions of the curve with a best straight-line fit. This method of mapping from one color gamut to another color gamut is less computationally intensive than conventional methods.

Abstract: A token passing media access protocol provides distributed time scheduling. The token provides an indication of each time at which a network device is to perform a cyclic or time critical operation. The token also provides an indication of system time to enable all devices on the network bus to be synchronized. The format of data transmissions on the network bus employs a shortened device address when referencing the device as a source. The source address corresponds to a unique portion of the device address.

Abstract: Through the method and apparatus of the present invention the collision of two packets can be detected with a high degree of accuracy under a variety of conditions. The preamble of each packet transmitted is modified to include collision detection data comprising an initial pulse having an amplitude sufficiently high to be detected even when attenuated and having a pulse width twice the normal data pulse width followed by a transceiver code of a predetermined length unique to each transceiver. Thus, in the event two packets collide, the collision may be detected by recognizing a second large pulse within a time period less than the sum of the packet duration and the gap between packets, by determining if a large initial pulse has a pulse width larger than the generated pulse width, and by determining if the transceiver code echoed back to the transmitting transceiver is equal to transceiver code stored in memory on the transceiver.

Abstract: A majority-voted output circuit generates an output parameter which is the majority vote of its input parameters by series-parallel combination of four intermediate switches, each said switch being a Boolean function of the input parameters, and the circuit being arranged so that failure of any one switch does not affect the value of the output parameter. Alternate embodiments are provided which use "don't care" signals to allow the majority vote of less than the full complement of input parameters. The majority-voted output circuit is subjected to testing by stepped transitions of its input parameters (to test for failure of any of the four intermediate switches) and by forcing current flow through predetermined current paths (to test for failure of a particular electrical connection).