Abstract: The present invention provides a method for robust interactive multimedia communications without the necessity of forward error correction or re-transmission. Video data is transmitted in the form of spatial packets known as I-frames and temporal packets known as motion vectors and associated prediction errors. The I-frames are inversely coded and stored and utilized as a basis for the motion vectors until a new I-frame is successfully inversely coded. Likewise, the motion vectors are also stored and used to produce P-frames until a new set of motion vectors is successfully transmitted.

Abstract: An apparatus and method for providing two way video communications includes a source and destination at each location. The destination includes dual display buffers, dual I-frame buffers, a motion vectors buffer and a backup display buffer. A first I-frame is transmitted from a source to a destination via a plurality of fragmented sub-frames. The sub-frames comprising the first I frame are received in a first frame buffer. Corresponding motion vectors and associated prediction error are received in the motion vectors buffer. Once each of the sub-frames of the first I-frame have been received in the first I frame buffer, they are inversely coded into the first display buffer. At predetermined time intervals a motion vector is applied to the inversely coded I-frame to display the applied I-frame stored in the first display buffer. Each of the motion vectors stored in the motion vectors is sequentially applied to the first I-frame.

Abstract: The present invention provides a method of minimizing the computation requirements involved in transmitting video images. By encrypting only a select portion of the transmitted data the transmission rate is improved without compromising privacy and still thereby reducing the compute time requirements. Wavelet-transform is repeatedly applied to a pixel matrix until a smooth coefficient matrix is achieved. The smooth coefficient matrix is necessary to regenerate the transmitted image at the receiving end. Only a single value of the smooth coefficient matrix is encrypted, thereby increasing the transmission rate of the entire image.