Geometric Statistics

Interface

Variables

AREA - the number of non-black (0,0,0) pixels in the current image

ANGLE - the orientation angle of the blob

COG_X, COG_Y - the center of gravity of the blob

PERIMETER - the number of pixels that surround non black blobs

AP_RATIO - AREA / PERIMETER, determines how round an image is; also known as "Perimeter Equivalent Diameter".

EQUIV_DIAMETER - the diameter of a circle with the same area as the region. Calculated as sqrt(4*Area/pi)

COMPACTNESS - (PERIMETER*PERIMETER) / AREA : ratio of the square of the perimeter to the area; also known as "shape".

COMPACTNESS_2 - sqrt(4*AREA/PI) / FERET : alternate compactness measure

CIRCULARITY - 4*PI*AREA/(PERIMETER*PERIMETER), measure of circularity.

CIRCULARITY_2 - alternate measure of circularity.

CIRCULARITY_3 - MIN_RADIUS/MAX_RADIUS : another alternate measure of circularity.

MAX_RADIUS - radius of enclosing circle around center of gravity

MIN_RADIUS - radius of enclosed circle around center of gravity

FERET - Feret's diameter also known as the caliper length or largest axis length: the greatest distance between any two non-zero pixels

FERET_AREA - FERET * BREATH; also know as Feret's bounding box

FERET_ORIENTATION - orientation of the Feret's diameter in degrees

FERET_FIRST_X
FERET_FIRST_Y
FERET_SECOND_X
FERET_SECOND_Y - points that makeup the Feret diameter

BREATH - the largest axis perpendicular to the Feret diameter

ROUNDNESS - 4*AREA/(Pi*(FERET*FERET)), measure of roundness

MIN_X - minimum bounding box x coordinate

MIN_Y - minimum bounding box y coordinate

MAX_X - maximum bounding box x coordinate

MAX_Y - maximum bounding box y coordinate

EXTENT - proportion of the pixels in the bounding box that are also in the region. Calculated as (blob area / bounding box area).

TOP_LEFT_X
TOP_LEFT_Y
TOP_RIGHT_X
TOP_RIGHT_Y
RIGHT_TOP_X
RIGHT_TOP_Y
RIGHT_BOTTOM_X
RIGHT_BOTTOM_Y
BOTTOM_LEFT_X
BOTTOM_LEFT_Y
BOTTOM_RIGHT_X
BOTTOM_RIGHT_Y
LEFT_TOP_X
LEFT_TOP_Y
LEFT_BOTTOM_X
LEFT_BOTTOM_Y - the extrema points of the image

FERET_ASPECT_RATIO - FERET/BREATH

BOX_ASPECT_RATIO - (MAX_X-MIN_X)/(MAX_Y-MIN_Y)

Note that you can highlight the appropriate statistics and press CTRL-C to copy the information to your clipboard. This information can then be pasted into Excel or other statistics programs.

See Also