Image compression technique

Image analysis – Histogram processing – For setting a threshold

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

382 4, 382 27, 382 50, 358260, G06K 956

Patent

active

047232986

ABSTRACT:
An optical and electronic scan produces an image composed of binary value pixels. An automatic picture compression routine reduces the number of pixels in the image. A first stage four to one reduction in the number of pixels is achieved by treating each mutually exclusive four pixel unit as a separate set. A binary value is assigned to each four pixel set. That binary value is assigned to a single pixel in a first output image. The same process is repeated a second time to provide a final output image that has one-sixteenth the number of pixels as has the original input image. The value assigned to each four pixel unit set is a weighted function of the binary value of each of the sixteen pixels in a four pixel by four pixel subfield in which the unit set is centered. The greatest weight is give to the center pixels, that is, to the four pixels of the unit set. Lesser weight is given to the peripheral pixels. Among the peripheral pixels, lesser weight is given to the four corner pixels than is given to the eight side pixels between the corners. In the weighting process, the significance of the binary value of the sixteen pixels in the subfield is in part a function of the total pattern of the pixel values in the subfield.

REFERENCES:
patent: 3560930 (1971-02-01), Howard
patent: 3849760 (1974-11-01), Endou
patent: 3973239 (1976-08-01), Kakumoto et al.
patent: 3975711 (1976-08-01), McMahon
patent: 4003024 (1977-01-01), Riganatti
patent: 4047152 (1977-09-01), Giuliano
patent: 4184206 (1980-01-01), Harano
patent: 4204227 (1980-05-01), Gurley
patent: 4225850 (1980-09-01), Chang
patent: 4298895 (1981-11-01), Arai et al.
patent: 4356555 (1982-10-01), Ejiri
patent: 4393452 (1983-07-01), Sekigawa
"The Application of an Image-Compression/Feature-Transgeneration Technique to the Computer-Aided Diagnosis of Brain Tumors", K. S. Han, R. W. McLaren, G. S. Lodwick, 8/72.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Image compression technique does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image compression technique, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image compression technique will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1639496

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.