面罩发电机面板
This panel hosts several ways of automatic mask generation. Specific areas of interest from the generated mask may further be selected for segmentation.See more about masks.
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Contents
Common fields
There are several common fields that do not depend on type of the selected mask generator.
- 1.Filter typecombo box, allows to select one of the possible mask generators
- 2. TheModeradio buttons:
- current, generate mask for the currently shown slice;
- 2D所有, generate mask for the whole dataset using the 2D mode, i.e. slice by slice;
- 3D, generate mask for the whole dataset using the 3D mode;
the whole dataset in the 2D mode,i.e.slice by slice;3D使用3D模式进行掩码生成
3.Do itbutton:
- -left mouse click, starts the selected generator. The existing mask will be deleted.
- -right mouse click + Do new mask, starts the selected generator. The existing mask will be deleted.
- -right mouse click + Generate new mask and add it to the existing mask, the generated mask will be added to the existing mask. This option may be used for multi-dimensional filtering: 1. run Generator for XY; 2. Change dimension by pressing |'XZ'| or |'YZ'| button in the Toolbar; 3. Run Generator again with the |Generate new mask and add it to the existing mask| option.
Frangi Filter
Hessian based Frangi Vesselness filter, written by Marc Schrijver and Dirk-Jan Kroon. This function uses the eigenvectors of the Hessian to compute the likeliness of an image region to contain vessels or other image ridges, according to the method described by Frangi1998,2001.
Note, to work properly this function should be compiled. See details inSystem Requirements
Parameters:
- Range, the range of sigmas used, default [1-6]
- Ratio, step size between sigmas, default [2]
- beta1, the Frangi correction constant, default [0.9]
- beta2, the Frangi correction constant, default [15]
- beta3, the Frangi vesselness constant which gives the threshold between eigenvalues of noise and vessel structure. A thumb rule is dividing the the greyvalues of the vessels by 4 till 6, default [500];
- B/W threshold, defines thresholding parameter for generation of theMasklayer. When set to 0 results in the filtered instead of binary image.
- Object size limit, after the run of the Frangi filter removes all 2D objects that are smaller than this value.
- Black on whitecheckbox, if checked, detects black ridges on white background.
Morphological filters
基于Matlab的形态过滤器套。
- 扩展 - 最大变换- based onimextendedmaxfunction of MATLAB. Computes the extended-maxima transform, which is the regional maxima of the H-maxima transform. Regional maxima are connected components of pixels with a constant intensity value, and whose external boundary pixels all have a lower value.
- 扩展 - 最小变换- based onimextendedminfunction of MATLAB. Computes the extended-minima transform, which is the regional minima of the H-minima transform. Regional minima are connected components of pixels with a constant intensity value, and whose external boundary pixels all have a higher value.
- H-maxima transform- 抑制高度小于H值的强度图像中的所有最大值。区域最大值是具有恒定强度值的像素的连接组件，其外部边界像素都具有较低的值。然后使用提供的阈值阈值将得到的图像阈值Thresholdvalue.
- H-minima transform- suppresses all minima in the grayscale image whose depth is less than H-value. Regional minima are connected components of pixels with a constant intensity value (t) whose external boundary pixels all have a value greater than t. The resulting image is then thresholded using the providedThresholdvalue.
- Regional maxima- based onimregionalmaxfunction of MATLAB. Returns the binary mask that identifies the locations of the regional maxima in the image. In mask, pixels that are set to 1 identify regional maxima; all other pixels are set to 0. Regional maxima are connected components of pixels with a constant intensity value, and whose external boundary pixels all have a lower value.
- Regional minima- based onimregionalminfunction of MATLAB. The output binary mask has value 1 corresponding to the pixels of the image that belong to regional minima and 0 otherwise. Regional minima are connected components of pixels with a constant intensity value, and whose external boundary pixels all have a higher value.
Strel Filter
Generate mask based on morphological image opening and black-and-white thresholding. The function first performs morphological bottom-hat (Black on whiteis checked) or top-hat (Black on whiteis unchecked) filtering of the image. The top-hat filtering computes the morphological opening of the image (usingimopen) and then subtracts the result from the original image. The result is then black and white thresholded with parameter in theB/W thresholdedit box.
- Strel size, defines size of the structural element (disktype) forimtophat.andimbothatfiltering.
- Fillcheckbox, check it to fill holes in the resultedMaskimage.
- B/W threshold, specifies parameter for the black and white thresholding.
- Size limit, limits the size of generated 2D objects so that objects smaller than this value are removed from theMaskduring the filter run.
- Black on whitecheckbox, when checked, the filter will use morphological bottom-hat filtering (imbothat)。当不受形态上流社会的filtering (imtophat.)。
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