CA2097951A1 - Compression and reconstruction of radiological images - Google Patents

Compression and reconstruction of radiological images

Info

Publication number
CA2097951A1
CA2097951A1 CA2097951A CA2097951A CA2097951A1 CA 2097951 A1 CA2097951 A1 CA 2097951A1 CA 2097951 A CA2097951 A CA 2097951A CA 2097951 A CA2097951 A CA 2097951A CA 2097951 A1 CA2097951 A1 CA 2097951A1
Authority
CA
Canada
Prior art keywords
image
compression
present
compression scheme
scheme
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2097951A
Other languages
French (fr)
Other versions
CA2097951C (en
Inventor
Dennis L. Wilson
James T. Stenstrom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lockheed Martin Tactical Systems Inc
Original Assignee
Loral Aerospace Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Loral Aerospace Corp filed Critical Loral Aerospace Corp
Publication of CA2097951A1 publication Critical patent/CA2097951A1/en
Application granted granted Critical
Publication of CA2097951C publication Critical patent/CA2097951C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
    • H04N19/86—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving reduction of coding artifacts, e.g. of blockiness
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H04N19/126—Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/154—Measured or subjectively estimated visual quality after decoding, e.g. measurement of distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/527—Global motion vector estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding

Abstract

The present invention provides for a compression scheme (10) tailored to the compression of large radiological images processed with image processing workstations.
The compression scheme (10) is a variation of the CCITT JPEG compression scheme with special care taken to suppress blocking effects of the 8x8 discrete cosine transform used therein. In accordance with the present invention, an original image (11) is downsampled (12), then interpolated (14) back to its original size, resulting in a smoothed image (14a). The difference (13) between the smoothed image (14a) and the original image (11) is then compressed (15) using an 8x8 discrete cosine transform with 12 bit data. Major artifacts present in the original image (11) are due to the mis-matching of the low frequency components of the image at the edges of the blocks.
When the low frequencies are removed by subtracting out the low frequency components, the artifacts disappear except in areas having very large dynamic changes. The compression scheme (10) of the present invention is particularly useful for archiving or telecommunicating images, achieving compression of more than 10:1 without losing the characteristics of the radiological image that permit effective diagnosis. A
reconstruction scheme is also disclosed which allows recovery of the image (11) from a compressed image file.
CA002097951A 1992-06-30 1993-06-08 Compression and reconstruction of radiological images Expired - Fee Related CA2097951C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US906,787 1992-06-30
US07/906,787 US5289548A (en) 1992-06-30 1992-06-30 Compression and reconstruction of radiological images

Publications (2)

Publication Number Publication Date
CA2097951A1 true CA2097951A1 (en) 1993-12-31
CA2097951C CA2097951C (en) 1999-08-17

Family

ID=25422977

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002097951A Expired - Fee Related CA2097951C (en) 1992-06-30 1993-06-08 Compression and reconstruction of radiological images

Country Status (5)

Country Link
US (1) US5289548A (en)
EP (1) EP0577363B1 (en)
JP (1) JP3182260B2 (en)
CA (1) CA2097951C (en)
DE (1) DE69320117T2 (en)

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Also Published As

Publication number Publication date
EP0577363A1 (en) 1994-01-05
DE69320117T2 (en) 1999-04-22
JPH06224769A (en) 1994-08-12
US5289548A (en) 1994-02-22
EP0577363B1 (en) 1998-08-05
DE69320117D1 (en) 1998-09-10
JP3182260B2 (en) 2001-07-03
CA2097951C (en) 1999-08-17

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