Method for sampling a uniform spatially-distributed sequence of

Details Method for sampling a uniform spatially-distributed sequence of Method for sampling a uniform spatially-distributed sequence of

1996-02-01

1997-04-08

Boudreau, Leo

Image analysis

Image transformation or preprocessing

Changing the image coordinates

382100, 377 44, G06K 932, G06K 900

Patent

active

056195974

ABSTRACT:
A computer-implemented method of transmitting images from a transmitter to a receiver (e.g. in a teleconferencing application). A receiver maintains an image in a local storage (e.g. that from a previous frame in a sequence of frames) and the transmitter receives an updated image for a next temporal period (e.g. the next frame). The transmitter divides the updated image into blocks and comparing a rotating pixel sample(s) of each of the blocks from the updated image with a sampled pixel from a local copy of a receiver's image at a same spatial position of the pixel sample(s). The transmitter determines a difference between the rotating sampled pixel of each of the blocks from the updated image and the local copy of the receiver's image. It stores a reference to the block and associates the difference with the reference. The receiver receives each of the blocks and updates the current image stored in the local storage by replacing each referenced block in the current image with each the received block to create an updated image and then displays the updated image. A computer-implemented method of performing a rotating sample of an image having pixels arranged in two axes (e.g. rows and columns) is also provided.

REFERENCES:
patent: 4546383 (1985-10-01), Abramatic et al.
patent: 5285276 (1994-02-01), Citta
patent: 5389965 (1995-02-01), Kuzma
Glassner "Graphics Gems" Academic Press, Inc. pp. 265-269, 1990.

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