JPS6474679A - Image processor for filter processing - Google Patents
Image processor for filter processingInfo
- Publication number
- JPS6474679A JPS6474679A JP23116687A JP23116687A JPS6474679A JP S6474679 A JPS6474679 A JP S6474679A JP 23116687 A JP23116687 A JP 23116687A JP 23116687 A JP23116687 A JP 23116687A JP S6474679 A JPS6474679 A JP S6474679A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- information
- fourier transform
- image
- projection
- 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.)
- Pending
Links
Abstract
PURPOSE:To improve the speed of image processing by using a filter means which performs the multiplication between an image and a filter function in a frequency space in a state where the Fourier transform FFT points are kept short, a means which calculates the return error component of said filter means from the image and the filter function, and a means which applies an error correcting process to the image of the filter output. CONSTITUTION:Projection information (the value equivalent to transmitted X rays with a CT device) is stored in a projection data storing means 1. A FET2 expands the information read out of the memory 1 and applies the fast Fourier transform to the expanded information. An information expanding part has the shortage of FFT points. An weight function W is stored in a filter function part 4 and then undergoes the Fourier transform through a FFT5. A filter 3 performs the convolution arithmetic (multiplication) between the projection information P(i) on the frequency areas of both FFT2 and 5 and the filter function. An error delta(h) calculation part 7 calculates a return error delta(h) based on the positive or negative delta(h). A correction part 8 corrects the projection information q(i) obtained by transforming the processing result of the filter 3 into a space area via an inverse Fourier transform part 6 by means of the error delta(h) for acquisition of the information q'(i). In such a way, the projection information can be corrected at a high speed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23116687A JPS6474679A (en) | 1987-09-17 | 1987-09-17 | Image processor for filter processing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23116687A JPS6474679A (en) | 1987-09-17 | 1987-09-17 | Image processor for filter processing |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6474679A true JPS6474679A (en) | 1989-03-20 |
Family
ID=16919349
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23116687A Pending JPS6474679A (en) | 1987-09-17 | 1987-09-17 | Image processor for filter processing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6474679A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010038411A1 (en) * | 2008-09-30 | 2010-04-08 | Canon Kabushiki Kaisha | Image processing method, image processing apparatus, and image pickup apparatus |
-
1987
- 1987-09-17 JP JP23116687A patent/JPS6474679A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010038411A1 (en) * | 2008-09-30 | 2010-04-08 | Canon Kabushiki Kaisha | Image processing method, image processing apparatus, and image pickup apparatus |
CN102165761A (en) * | 2008-09-30 | 2011-08-24 | 佳能株式会社 | Image processing method, image processing apparatus, and image pickup apparatus |
US9041833B2 (en) | 2008-09-30 | 2015-05-26 | Canon Kabushiki Kaisha | Image processing method, image processing apparatus, and image pickup apparatus |
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