초록 ▼

An apparatus and method for signal processing employing intraframe and interframe variable prediction transform coding. Images are represented by sequential frames of two-dimensional arrays of digital signals. The digital signals are transformed to form transform coefficients for each frame. Predict

An apparatus and method for signal processing employing intraframe and interframe variable prediction transform coding. Images are represented by sequential frames of two-dimensional arrays of digital signals. The digital signals are transformed to form transform coefficients for each frame. Predicted transform coefficients are formed using sets of variable prediction factors. The predicted transform coefficients for each frame are compared with corresponding actual transform coefficients for the frame to form transform coefficient difference signals. The difference signals are processed to control their range of values. The processed difference signals are statistically coded such that the more frequently occurring values are represented by shorter code lengths and the less frequently occurring values are represented by longer code lengths. The coded signals are stored in a buffer memory for transmission.

대표청구항 ▼

A method for processing image signals to reduce the amount of data utilized to represent images where the images are defined by a sequence of frames where each frame includes a two-dimensional array of digital signals representing the image, the steps comprising, transforming the digital signals to

A method for processing image signals to reduce the amount of data utilized to represent images where the images are defined by a sequence of frames where each frame includes a two-dimensional array of digital signals representing the image, the steps comprising, transforming the digital signals to form transform coefficients for each of a plurality of frames in the sequence of frames, forming predicted transform coefficients for a first frame using variable prediction factors, comparing said predicted transform coefficients with corresponding transform coefficients of a second frame to provide transform coefficient difference signals for each of the coefficients of said second frame, processing said transform difference signals to form processed difference signals having a controlled range of values, coding said processed difference signals to form statistically coded signals such that the more frequently occurring values of coded signals are represented by shorter code lengths and the less frequently occurring values of coded signals are represented by longer code lengths.