Abstract: Material is represented by transform coefficients represented by digital numbers. A method of perceptibly watermarking the material comprises the steps of: changing representations of the said numbers according to an invertible algorithm without changing the number of bits in the said numbers; and encoding the changed n bit numbers to effect compression encoding of the material.

Abstract: A spatial domain image I produced by a source 1 is combined with watermark data Ri to produce a spatial domain watermarked image I′.

Abstract: Apparatus 10 for providing a plurality of output video signals for near video on demand transmission, said apparatus 10 comprising: a control unit 30 connected to a primary video data storage unit 20 for receiving video data therefrom; and a temporary storage and replay array 50 for storing and replaying said video data, said array comprising of a plurality of serially connected individual storage units 60(1) . . . 60(n), a first 60(1) of said storage units being connected to said control unit 30 for data transfer therebetween; wherein, in use, data is transferred sequentially from said control unit 30 to said first storage unit 60(1) for transmission, said first storage unit 60(1) retransferring said data to a second 60(2) and subsequent storage units for retransmission.

Abstract: Digital image enhancement apparatus for processing an input sampled image signal having an input sample rate to generate an output, enhanced, image signal at the input sample rate comprises one or more filters for filtering and sample rate up-converting the input image signal to generate a detail signal at an intermediate sample rate higher than the input sample rate and for generating an intermediate image signal, the intermediate image signal being a sample rate up-converted version of the input image signal; a detecting circuit for detecting whether a combination of the detail signal and the intermediate image signal goes beyond predefined limits on the signal level of the output image signal and, if so, for modifying the detail signal so that a combination of the detail signal and the intermediate image signal would not go beyond the predefined limits on the signal level of the output image signal; a sample rate down-converter for converting the detail signal to a down-converted detail signal at the input

Abstract: Signal processing apparatus comprises a control read only memory storing:(i) two or more sets of signal processing parameter data to control signal processing operations of the apparatus; and(ii) configuration data specifying one of the sets of signal processing parameter data stored in the control read only memory;a control read/write memory capable of storing:(i) at least one set of signal processing parameter data; and(ii) configuration data capable of specifying a set of signal processing parameter data stored in the control read only memory or a set of signal processing parameter data stored in the control read/write memory;and control logic, responsive to an input selection signal specifying whether the configuration data in the control read only memory or the configuration data in the read/write memory should be selected for use, for controlling the signal processing apparatus to perform signal processing operations in accordance with the signal processing parameter data specified by the selected confi

Abstract: Video down-conversion apparatus in which an input, higher definition video signal is converted to an output, lower definition video signal having a smaller number of active lines and/or a smaller number of active pixels per line than the input video signal, comprises: an interpolator for receiving pixels of the input video signal at an input pixel rate and interpolating output data values at the input pixel rate, the output data values comprising active output pixel values interspersed with dummy pixel values; control logic for generating an active enable signal associated with the output data values generated by the interpolator, the active enable signal having a first state when an active output pixel value is generated and a second state when a dummy pixel value is generated; a signal processing device connected to receive the output data values generated by the interpolator, the signal processing device comprising an input latch operable to latch an output data value from the interpolator only when the ac

Abstract: Video down-conversion apparatus in which lines of successive output video field are interpolated from lines of respective input video fields, the apparatus being selectively operable to interpolate each output field from an input field of either field polarity so that the successive output video fields can maintain a regular odd-even field polarity sequence even if there is a discontinuity in the field polarity sequence of the input video fields.