Generate a bandpass filter with Gaussian or sinusoidal shape.
::gen_std_bandpass generates a rotationally invariant bandpass filter with the response being determined by the parameters Frequency and Sigma: Frequency determines the location of the maximum response with respect to the DC term, while Sigma determines the width of the frequency band that passes the filter. For Mode = 'gauss', a Gaussian response is generated with Sigma being the standard deviation. For Mode = 'sin', a sine function is generated with the maximum at Frequency and the extent Sigma.
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ImageFilter (output_object) |
image(-array) -> Hobject * : HImage(Array) ( byte ) |
| Bandpass filter as image in the frequency domain. | |
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Frequency (input_control) |
real -> HTuple.double |
| Distance of the filter's maximum from the DC term. | |
| Default value: 20 | |
| Suggested values: 0.0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 80, 100, 150, 200 | |
| Typical range of values: 0.0 <= Frequency <= 1000 | |
| Minimum increment: 1 | |
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Recommended increment: 2 | |
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Sigma (input_control) |
real -> HTuple.double |
| Bandwidth of the filter (standard deviation). | |
| Default value: 1.0 | |
| Suggested values: 0.1, 0.3, 0.7, 1.0, 1.5, 2.0, 3.0, 5.0, 7.0, 10.0, 15.0, 20.0, 30.0, 50.0 | |
| Typical range of values: 0.05 <= Sigma <= 100.0 | |
| Minimum increment: 0.001 | |
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Recommended increment: 0.1 | |
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Size (input_control) |
integer -> HTuple.long |
| Size (dimension) of the image (filter). | |
| Default value: 512 | |
| List of values: 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192 | |
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Mode (input_control) |
string -> HTuple.char * |
| Filter type. | |
| Default value: 'sin' | |
| List of values: 'sin', 'gauss' | |
::gen_std_bandpass returns H_MSG_TRUE if all parameters are correct. If necessary, an exception handling is raised.
::gen_sin_bandpass, ::gen_bandpass, ::gen_bandfilter, ::gen_highpass, ::gen_lowpass
Image filters
