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eyes:logics:filtering [2017/06/07 15:33] jschlie1 |
eyes:logics:filtering [2017/06/12 17:38] (current) jschlie1 |
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| ===== Usage ===== | ===== Usage ===== | ||
| - | A stack of images/3Ds or an individual 3D will be subjected to the selected filter with its respective filter parameters. For more detail on the capabilities of the available filters and their parameters, consult the respective process section below. Since most of the filters just have one input (stack of images) and one output (stack of images w/ applied filter), only divergent in-/outputs are mentioned. | + | A stack of images/3Ds or an individual 3D will be subjected to the selected filter with its respective filter parameters. For more detail on the capabilities of the available filters and their parameters, consult the respective process section below. Since most of the filters just have one input (e.g. stack of images) and one output (e.g. stack of images w/ applied filter), only divergent in-/outputs are mentioned. |
| - | + | ||
| - | ===== Example ==== | + | |
| - | FIXME | + | |
| ===== Processes ===== | ===== Processes ===== | ||
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| Applies a [[http://en.wikipedia.org/wiki/Butterworth_filter|Butterworth Filter]] with the chosen parameters to the images. A butterworth filter has a smooth transfer function without any discontinuity. The filter functions used in this logic are: | Applies a [[http://en.wikipedia.org/wiki/Butterworth_filter|Butterworth Filter]] with the chosen parameters to the images. A butterworth filter has a smooth transfer function without any discontinuity. The filter functions used in this logic are: | ||
| - | //B(Low Pass)= 1/ (1+[D(u,v)/D<sub>L </sub>]<sup>2n</sup>)// | + | B(Low Pass)= 1/ (1+[D(u,v)/D<sub>L </sub>]<sup>2n</sup>) |
| - | //B(High Pass)= 1- (1/ (1+[D(u,v)/D<sub>H</sub>]<sup>2n</sup>))// | + | |
| + | B(High Pass)= 1- (1/ (1+[D(u,v)/D<sub>H</sub>]<sup>2n</sup>)) | ||
| where D(u,v) is the distance from the origin, n is the order of the filter and D<sub>L</sub>/D<sub>H</sub> is the cut frequency. | where D(u,v) is the distance from the origin, n is the order of the filter and D<sub>L</sub>/D<sub>H</sub> is the cut frequency. | ||