Image analysis – Histogram processing – For setting a threshold
Patent
1990-02-27
1992-03-17
Moore, David K.
Image analysis
Histogram processing
For setting a threshold
382 56, 358451, 358428, G06K 936
Patent
active
050975188
ABSTRACT:
Apparatus and accompanying method(s) for digitally scaling, particularly reducing, an original image to yield a scaled image particularly suited for display by a document workstation in an image management system as one image in a composite multi-image display. Reduction scaling is achieved by logically combining pixels values in each block of pixels in an original bi-tonal image, preferably through an "OR" operation, in order to generate a corresponding single pixel value in a scaled bi-tonal image. To reduce the original image by a non-integer scale factor, the pixel blocks that form the original image are assigned differing groupsizes that periodically vary on a two-dimensional pattern from block to block throughout the original image. The average value of the periodic variation occurring in each direction throughout a sufficiently large two-dimensional area in the original image substantially equals the fractional portion of the non-integer scale factor. If integer scaling is desired in either the horizontal or vertical direction, then the groupsize remains the same along that direction from block to block throughout the original image. Alternatively, to digitally enlarge (magnify) an original bi-tonal image, each pixel in the original image is replicated to form a corresponding block of pixels in a destination (enlarged) image. In order to two-dimensionally magnify the source image by non-integer scale factors in both the horizontal and vertical directions, the groupsize of successive pixel blocks in the destination image is appropriately varied, also through a corresponding two-dimensional pattern. The groupsize remains fixed along either direction if the original image is to be magnified along that direction by an integer scale factor.
REFERENCES:
patent: 3976982 (1976-08-01), Eiselen
patent: 4129860 (1978-12-01), Yonezawa et al.
patent: 4302776 (1981-11-01), Taylor et al.
patent: 4503469 (1985-03-01), Kato
patent: 4532602 (1985-07-01), DuVall
patent: 4587621 (1986-05-01), DuVall
patent: 4610026 (1986-09-01), Tabata et al.
patent: 4616268 (1986-10-01), Shida
patent: 4636869 (1987-01-01), Tomohisa et al.
patent: 4656467 (1987-04-01), Strolle
patent: 4665551 (1987-05-01), Sternberg
patent: 4712140 (1987-12-01), Mintzer et al.
patent: 4764975 (1988-08-01), Inoue
patent: 4829587 (1989-05-01), Glazer et al.
patent: 4831659 (1989-05-01), Miyaoka et al.
patent: 4872064 (1989-10-01), Tutt et al.
patent: 4907171 (1990-03-01), Nagashima
S. Hazan, "A Novel LSI Architecture for Image Scaling", Proceedings of TENCON 87: 1987 IEEE Region 10 Conference `Computers and Communications Technology Toward 2000`, Seoul, Korea, 25-28 Aug. 1987, vol. 1, pp. 110-114.
K. Kashiwagi et al, "Scaling Algorithm for Bit-Map Image", IBM Technical Bulletin, vol. 27, No. 7B, Dec. 1984, pp. 4323-4325.
H. Hou et al, "Digital Processing of Halftone Images", Proceedings of the SPIE--The International Society of Optical Engineering, Methods of Handling and Processing Imagery, Los Angeles, Calif., 15-16 Jan. 1987, vol. 757, pp. 118-124.
P. Zamperoni, "Scaling of Contour-Coded Binary Images", Electronic Letters, 14 Sep. 1978, vol. 14, No. 19, pp. 608-610.
Knudson Mark
Scott Kevin C.
Arndt Dennis R.
Eastman Kodak Company
Jung Yon
Moore David K.
LandOfFree
Technique for performing digital image scaling by logically comb does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Technique for performing digital image scaling by logically comb, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Technique for performing digital image scaling by logically comb will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1481943