Edge extraction using bandpass filters.
bandpass_image serves as an edge filter. It applies a linear filter with the following convolution mask to Image:
FilterType: 'lines' In contrast to the edge operator sobel_amp this filter detects lines instead of edges, i.e., two closely adjacent edges. 0 -2 -2 -2 0 -2 0 3 0 -2 -2 3 12 3 -2 -2 0 3 0 -2 0 -2 -2 -2 0
At the border of the image the gray values are mirrored. Over- and underflows of gray values are clipped. The resulting images are returned in ImageBandpass.
|
Image (input_object) |
(multichannel-)image(-array) -> object : byte / uint2 |
| Input images. | |
|
ImageBandpass (output_object) |
(multichannel-)image(-array) -> object : byte / uint2 |
| Bandpass-filtered images. | |
|
FilterType (input_control) |
string -> string |
| Filter type: currently only 'lines' is supported. | |
| Default value: 'lines' | |
| List of values: 'lines' | |
bandpass_image(Image,&LineImage,"lines"); threshold(LineImage,&Lines,60.0,255.0); skeleton(Lines,&ThinLines);
bandpass_image returns 2 (H_MSG_TRUE) if all parameters are correct. If the input is empty the behaviour can be set via set_system(::'no_object_result',<Result>:). If necessary, an exception handling is raised.
bandpass_image is reentrant and automatically parallelized (on tuple level, channel level, domain level).
convol_image, topographic_sketch, texture_laws
Image filters
