Systems and methods for digital image compression
AssigneeAccusoft Corporation
InventorsScott J. Warner, Anatholy F. Dedkov
Life of this patent
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Abstract
Systems and methods for compressing portions of a digital image, transmitting the compressed portions over a network, receiving them, decompressing them, and progressively displaying an image representing the original image. An encoder selects an interlaced portion of the original image based on a resolution factor and compresses each line of that portion by selecting the most efficient of multiple compression methods, including Group 3 and modified Group 4 coding schemes. Compressed portions of the original image are transmitted in successive stages, decompressed, and interlaced with the previously transmitted portions of the image, resulting in progressive enhancement of the transmitted, displayed image.
Claims13
A method for compressing an image comprising lines of data, comprising the steps of:
- (a) defining a segment of s consecutive lines in said image;
- (b) determining a selected line in said segment as a starting line;
- (c) determining a plurality of lines, beginning with said starting line, by selecting additional lines spaced by multiples of s from said starting line until no further of said additional lines can be selected from said image for said plurality of lines;
- (d) compressing each of said plurality of lines;
- (e) selecting a longest range of lines yet to be selected in said segment;
- (f) determining a middle line equally distant from the beginning and the end of said longest range of lines;
- (g) setting said middle line as said starting line;
- and
- (h) repeating steps (c) through (g) recursively until a predetermined limit of lines has been compressed.
Dependencies are inferred from the claim text.