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Frequency domain filtering-based CBCT (Cone Beam Computed Tomography) panoramic image enhancement method

A technology of panorama and frequency domain, which is applied in the field of CBCT panorama enhancement based on frequency domain filtering, can solve the problem of unsatisfactory high-resolution CBCT image enhancement, and achieve the effect of enriching edge information

Active Publication Date: 2015-04-01
南通市牧井微电科技发展有限公司 +1
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Problems solved by technology

[0005] Purpose of the invention: the purpose of the present invention is to solve the problem of the overall contrast of the image in the prior art, which cannot meet the shortcomings of high-resolution and low-contrast CBCT image enhancement, and to provide a method that utilizes the global characteristics of the image to enhance the overall contrast of the image, thereby An enhancement method based on frequency domain filtering to achieve enhanced edge information of CBCT images

Method used

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  • Frequency domain filtering-based CBCT (Cone Beam Computed Tomography) panoramic image enhancement method
  • Frequency domain filtering-based CBCT (Cone Beam Computed Tomography) panoramic image enhancement method
  • Frequency domain filtering-based CBCT (Cone Beam Computed Tomography) panoramic image enhancement method

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Embodiment Construction

[0026] Such as figure 1 A kind of CBCT panorama enhancement method based on frequency domain filtering shown, comprises the following steps:

[0027] (1) Read an image f(x,y) with a size of M×N, calculate the filling parameters P and Q, and fill f(x,y) with 0 to form an image f with a size of P×Q p (x,y);

[0028] (2) Calculate the Fourier transform of the image f(x,y) to obtain F(u,v);

[0029] (3) Generate a real, symmetrical high-frequency filter function H HP (u,v), whose size is P×Q, the center of the filter is on the four corners of the matrix boundary;

[0030] (4) generate a high-frequency emphasis filter according to the expression;

[0031] (5) Calculate the high-frequency emphasis filter and F(u,v) according to the calculation formula;

[0032] (6) carry out inverse Fourier transform to the image obtained in step (5), and convert it into a space domain image;

[0033] (7) Extract the M×N region from the upper left quadrant of the image obtained in step (6), an...

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Abstract

The invention discloses a frequency domain filtering-based CBCT panoramic image enhancement method, which includes the following steps: Fourier transform is carried out on an original image, a high-pass filter is produced, high-pass filtering is carried out on the original image, an offset is added according to the high-frequency emphasis filter, and finally, Fourier inverse transform is carried out, so that a spatial-domain image is obtained. The method overcomes the defect of low contrast in conventional CBCT images, enriches the edge information of images, and offers effective help to clinical applications for doctors.

Description

technical field [0001] The invention relates to a method for enhancing a CBCT panorama, in particular to a method for enhancing a CBCT panorama based on frequency domain filtering. Background technique [0002] Cone beam (cone beam) CT is a three-dimensional imaging device that has developed rapidly in recent years and has the most advantages in dental clinics. CBCT uses flat-panel detectors and cone-beam X-rays to perform rotational scans around the object (180-360 times, depending on the product). The obtained two-dimensional projection image is used in the computer to use the cone beam CT reconstruction algorithm to obtain three-dimensional volume data. The biggest difference between it and spiral CT is that the projection data in each direction during CBCT scanning is two-dimensional, and the three-dimensional volume data can be directly obtained after reconstruction, while the projection data in each direction during spiral CT scanning is one-dimensional, and reconstru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/10
Inventor 徐建军王远军聂生东
Owner 南通市牧井微电科技发展有限公司
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