Method for image compression on a personal computer

Details Method for image compression on a personal computer Method for image compression on a personal computer

1992-04-08

1994-02-15

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

36471502, 348384, G06K 936, H04N 712

Patent

active

052874206

ABSTRACT:
A method and apparatus for image compression suitable for personal computer applications, which compresses and stores data in two steps. An image is captured in real-time and compressed using an efficient method and stored to a hard-disk. At some later time, the data is further compressed in non-real-time using a computationally more intense algorithm that results in a higher compression ratio. The two-step approach allows the storage reduction benefits of a highly sophisticated compression algorithm to be achieved without requiring the computational resources to perform this algorithm in real-time. A compression algorithm suitable for performing the first compression step on a host processor in a personal computer is also described. The first compression step accepts 4:2:2 YCrCb data from the video digitizer. The two chrominance components are averaged and a pseudo-random number is added to all components. The resulting values are quantized and packed into a single 32-bit word representing a 2.times.2 array of pixels. The seed value for the pseudo-random number is remembered so that the pseudo-random noise can be removed before performing the second compression step.

REFERENCES:
patent: 4903317 (1990-02-01), Nishihara et al.
patent: 5050230 (1991-09-01), Jones et al.
patent: 5068745 (1991-11-01), Shimura
patent: 5101280 (1992-03-01), Moronaga et al.
patent: 5124811 (1992-06-01), Ohsawa et al.
patent: 5138459 (1992-08-01), Roberts et al.

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