Superposition image preprocessing method based on principal direction restraining high-pass filter
A high-pass filter, superimposed image technology, applied in image data processing, image enhancement, image analysis and other directions, can solve problems such as false alarms, and achieve the effect of reducing false detection, improving detection rate, and suppressing undulating background.
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[0024] The accompanying drawings constituting a part of this application are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention:
[0025] Such as figure 1 Shown, specifically, provided by the present invention, comprises the following steps:
[0026] (1), the input superimposed image is subjected to Fourier transform;
[0027] (2), fuse the second-order Butterworth filter with the direction filter, and design a main direction suppression high-pass filter. The calculation formula of the filter is:
[0028]
[0029] (3), adopt the filter designed in step 2 to filter the Fourier transform result of the superimposed image obtained in step 1, and the calculation formula is as follows:
[0030]
[0031] (4) Perform inverse Fourier transform on the filtering result obtained in...
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