US4590582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image data processing apparatus for performing spatial filtering of image data
Assignee: Toshiba Corp
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Filing: 1983-10-06
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Granted: 1986-05-20
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Expires: 2003-10-06
Abstract
Abstract In a digital radiographic technique, a spatial filtering process has been widely introduced. The image data processing apparatus includes a first storage device for storing original image data in a digital form which is used for medical diagnosis. A filtering device is provided for performing a filtering function to the original image data so as to control spatial frequency characteristics of the original image data. A second storage device is used for storing the filtered image data derived from the filtering device, and a first multiplexer device is provided for multiplying the filtered image data which is stored in the second storage device, by a first parameter so as to give a first weighted value to the filtered image data. A second multiplier device is used for multiplying the original image data which is stored in the first storage means, by a second parameter so as to give a second weighted value to the original image data, and a parameter input terminal device is provided for producing the two parameters and delivering the same to the first and second multiplier devices respectively. An adder is provided for performing a linear combination operation between the first and second multiplied image data so as to obtain an added image data whose spatial frequency characteristics are controlled to be different from that of the original image data.
Inventors
- 👤 Yoshiyuki Umemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:54
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/20; Y; Y10; Y10S; Y10S378/00; Y10S378/901
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
A filtering apparatus for digital image data comprising: first memory means for storing original image data; filtering means for smoothening said original image data derived from said first memory means to produce smoothened image data; second storage means for storing said smoothened image data derived from said filtering means; first multiplier means for multiplying said smoothened image data, derived from said second storage means, by a first constant; second multiplier means for multiplying said original image data, derived from said first memory means, by a second constant; adder means for adding said smoothened image data multiplied by said first constant to said original image data multiplied by said second constant to produce filtered image data; and control means for adjusting said first constant and second constant to vary characteristics of said filtered image data.
Claim 2
Dependent Claim
134 words
A filtering apparatus for digital image data comprising: first memory means for storing original image data; filtering means for smoothening said original image data derived from said first memory means to produce smoothened image data; second storage means for storing said smoothened image data derived from said filtering means; first multiplier means for multiplying said smoothened image data, derived from said second storage means, by a first constant; second multiplier means for multiplying said original image data, derived from said first memory means, by a second constant; adder means for adding said smoothened image data multiplied by said first constant to said original image data multiplied by said second constant to produce filtered image data; and control means for adjusting said first constant and second constant to vary characteristics of said filtered image data.
Claim 3
Dependent Claim
29 words
An image data processing apparatus as claimed in claim 1, wherein: further comprising third storage means for storing said filtered image data which is derived from said adder means.
Claim 4
Dependent Claim
43 words
An image data processing apparatus as claimed in claim 1: said adder means further comprising an address signal generating circuit for frequency-dividing clock pulse signals so as to generate the address signals which are used to access said first and second storage means.
Claim 5
Dependent Claim
129 words
An image data processing apparatus as claimed in claim 1, further comprising a parameter input terminal means including a first parameter generator comprising a first variable resistor for producing a first DC voltage, a first analog/digital converter for converting said first DC voltage into a corresponding first digital value, and a first arithmetic logic unit for performing an arithmetic logic operation so as to obtain said first constant from said first digital value, and a second parameter generator comprising a second variable resistor for producing a second DC voltage, a second analog/digital converter for converting said second DC voltage into a corresponding second digital value and a second arithmetic logic unit for performing an arithmetic logic operation so as to obtain said second constant from said second digital value.
Claim 6
Dependent Claim
67 words
An image data processing apparatus as claimed in claim 4, said parameter input terminal means further including an operation panel on which a plurality of spatial frequency characteristic curves are illustrated and which is electrically coupled to said first and second parameter generators, whereby when one of said spatial frequency characteristic curves is designated, said first and second parameter generators produce the corresponding first and second constants.
Claim 7
Dependent Claim
22 words
An image data processing apparatus as claimed in claim 1, wherein: all coefficients of said filtering means are selected to be "1".
Claim 8
Dependent Claim
109 words
A filtering apparatus for digital image data comprising: first memory means for storing original image data; filtering means for smoothening said original image data derived from said first memory means to produce smoothened image data; second storage means for storing said smoothened image data derived from said filtering means; multiplier means for multiplying said smoothened image data, derived from said second storage means, by a constant; adder means for adding said smoothened image data multiplied by said constant and said original image data derived from said first memory means to produce filtered image data; and control means for adjusting said constant to vary characteristics of said filtered image data.
Claim 9
Dependent Claim
109 words
A filtering apparatus for digital image data comprising: first memory means for storing original image data; filtering means for smoothening said original image data derived from said first memory means to produce smoothened image data; second storage means for storing said smoothened image data derived from said filtering means; multiplier means for multiplying said smoothened image data, derived from said second storage means, by a constant; adder means for adding said smoothened image data multiplied by said constant and said original image data derived from said first memory means to produce filtered image data; and control means for adjusting said constant to vary characteristics of said filtered image data.
Claim 10
Dependent Claim
28 words
An image data processing apparatus as claimed in claim 7, further comprising third storage means for storing said filtered image data which is derived from said adder means.
Claim 11
Dependent Claim
43 words
An image data processing apparatus as claimed in claim 7: said adder means further comprising an address signal generating circuit for frequency-dividing clock pulse signals so as to generate the address signals which are used to access said first and second storage means.
Claim 12
Dependent Claim
60 words
An image data processing apparatus as claimed in claim 7, further comprising a parameter input terminal means including a variable resistor for producing a DC voltage, an analog/digital converter for converting said DC voltage into a corresponding digital value and an arithmetic logic unit for performing an arithmetic logic operation so as to obtain said constant from said digital value.
Claim 13
Dependent Claim
22 words
An image data processing apparatus as claimed in claim 7, wherein: all coefficients of said filtering means are selected to be "1".
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |