Morphology . blobber | Mlx Home
Morphological measurements available with the blob widget top
The area is the number of pixels in an object. Strictly speaking, this is the number of contiguous pixels forming a group. The pixels chosen depend on the threshold setting - it is possible, even likely, that the pixels in the group do not exactly correspond to the desired object.
Maximum diameter top
Maximum Feret Diameter, or maximum caliper diameter. Calculated by an algorithm that traverses the perimeter of the object, searching for the pixels on the diameter that are the farthest apart.
Length of the perimeter in pixels. Calculated as the sum of the lengths of the line segments connecting the centers of the OUTSIDE edges of the outermost pixels of a group. The outermost pixels are those that touch the background along at least one edge. Diagonally spaced edge pixels are separated by (sqrt 2). This perimeter measure is less than that calculated by tracing the outside edges of the pixels (it cuts off the corners along diagonal lines) and greater than the edge pixel count. I think it is a reasonable measure.
(x,y) coordinates of the center of mass of the pixel group (or 'blob').
Weighted Centroid top
Same as centroid, except that the coordinate of each pixel is weighted by the pixel intensity, when 'averaged into' the center of mass calculation.
Electron Microscope automation, Microanalysis Group, NIST top
Definitions of morphology terms from VAX Lispix EM automation particle
analyzer. These will be implemented into macLispix as required.
CUP_C_AFTER_IMG 710.0 sample of an image parameter. Cup current after
image was scanned.
NIH Image parameters