Archived page: ADCIS Products: Previous Version: Measurement List

Regions

AREA

The calibrated area of the region.

BOUNDING_RECT_FILL

PIXEL_COUNT / (HEIGHT *WIDTH). This measure is 1.0 for a perfect rectangle and approaches zero for very sparse structures.

BR_TO_PERIMETER

PERIMETER / (2 * HEIGHT + 2 * WIDTH). This measure is 1.0 for a convex region, larger for regions with boundaries which double back on themselves.

CENTROID.[X,Y]

The center of mass of the region, the average location of the pixels. Pixels are considered to have area 1.0, covering the entire int32 of the coordinate system. Thus, the centroid of a single pixel will appear at the center of the pixel.

COMPACTNESS

16*PIXEL_COUNT / (PERIMETER ** 2). This measure is 1.0 for a perfect square, smaller for shapes with irregular boundaries. This is discussed in the literature as maximal for a circle, but that is the case only for continuous geometry, and our representation is discrete.

ELONGATION

The difference between the lengths of the major and minor axes of the best ellipse fit, divided by the sum of the lengths. This measure is zero for a circle and approaches 1.0 for an ellipse which is long and narrow.

HEIGHT

The height of the region. Calibrated.

INTENSITY

The minimum, maximum, mean, and standard deviation of the pixel values within the region.

LOG_HEIGHT_TO_WIDTH

logl0(HEIGHT/WIDTH). This gives a symmetric measure of aspect ratio.

MAJOR_AXIS

The direction of the longest projection.

MBR_ANGLE

The angle of the major, or longer, axis of the minimum bounding rectangle.

MBR_CENTER.[X,Y]

The coordinates of the center of the minimum bounding rectangle.

MBR_DIAMETERS

An array of Feret diameters.

MBR_FILL

The ratio of PIXEL_COUNT to the area of the minimum bounding rectangle.

MBR_HEIGHT

The height of the minimum bounding rectangle.

MBR_POLYGON

A 4-side polygon representing the oriented minimum bounding rectangle. This is useful for visualizing the MBR.

MBR_WIDTH

The width of the minimum bounding rectangle.

NUMBER_OF_BLOBS

The number of 4-way connected groups of pixels in the region. If, for example, we represented the white squares of a chess board in a region, this measure would be 32.

NUMBER_OF_HOLES

The number of 4-way connected groups of off pixels completely surrounded by on pixels in the region. A donut shape would have a value of 1. The white squares of a chess board would have a value of 18.

PERIMETER

The number of occurrences of a pixel in the region that is 4-way adjacent to pixel not in the region. Each boundary is counted once, so a single pixel region has a perimeter of four. Calibrated.

PIXEL_COUNT

The number of pixels in the region.

REGION_EXTENTS.LL.[X,Y]

The lowest coordinates of the region.

REGION_EXENTS.UR.[X,Y]

The highest coordinates of the region.

WIDTH

The calibrated width of the region.

 

 

Color Attributes

RED

The minimum, maximum, mean, and standard deviation of the values of the red band within the region.

GREEN

The minimum, maximum, mean, and standard deviation of the values of the green band within the region

BLUE

The minimum, maximum, mean, and standard deviation of the values of the blue band within the region

EXRED

(2 * Red) - Green- Blue. A good indication of whether the region appears red.

EXGREEN

(2* Green) - Red - Blue. A good indication of whether the region appears green.

EXBLUE

(2* Blue)- Red- Green. A good indication of whether the region appears blue.

HUE

The minimum, maximum, mean, and standard deviation of the hue values at each pixel within the region.

SATURATION

The minimum, maximum, mean, and standard deviation of the values of the saturation at each pixel within the region.

 

 

Points and Edgels

ANGLE

The angles, in radians, of the pixel-length edgel.

EDGEL.X

The X coordinate of the center of the edgel.

EDGEL.Y

The Y coordinate of the center of the edgel.

MAGNITUDE

The strength of the edgel.

 

 

Lines

DISPERSION

-

liNE.P1.X

The X coordinate of the first endpoint of the line.

liNE.P1.Y

The Y coordinate of the first endpoint of the line.

liNE.P2.X

The X coordinate of the second endpoint of the line.

liNE.P2.Y

The Y coordinate of the second endpoint of the line.

liNE_ANGLE

The angle, in radians, of the line.

liNE_CONTRAST

The average change in intensity across the line.

liNE_INTENSITY

The average intensity of the pixels under the line.

liNE_MIDPOINT.[X,Y]

The coordinates of the midpoint in the line segment.

liNE_MAX_T

The maximum T value in polar coordinates.

liNE_MIN_T

The minimum T value in polar coordinates.

liNE_RHO

The perpendicular distance of the line from the origin.

liNE_THETA

The angle of the line in polar coordinates.

liNE_LENGTH

The length of the line in pixels.

PIXEL_COUNT

The number of pixels in the support region.

REGION

The “support region”: the pixel under the line.

 

 

Rectangles

PIXEL_COUNT

The number of pixels in the underlying region.

RECTANGLE.LL.X

The lowest X value of the rectangle.

RECTANGLE.LL.Y

The lowest Y value of the rectangle.

RECTANCLE.UR.X

The highest X value of the rectangle.

RECTANGLE.UR.Y

The highest Y value of the rectangle.

 

 

Chains

CHAIN.EXTENTS.LL.X

The lowest X value of the points in the chain.

CHAIN.EXTENTS.LL.Y

The lowest Y value of the point in the chain.

CHAIN.EXTENTS.UR.X

The highest X value of the points in the chain.

CHAIN.EXTENTS.UR.Y

The highest Y value of the points in the chain.

CHAIN.FLAGS

2 if the chain is open, 0 otherwise.

CHAIN.NUMPOINTS

The number of points in the chain.

MEMBER_EDGELS

The lowest edgel objects that make up the chain.

 

 

Polygons

AREA

Calibrated area of the polygon.

POLYGON.EXTENTS.L.LX

The lowest X value of the polygon.

POLYGON.EXTENTS.LL.Y

The lowest Y value of the polygon.

POLYOON.EXTENTS.UR.X

The highest X value of the polygon.

POLYGON.EXTENTS.UR.Y

The highest Y value of the polygon.

POLYGON.NUMPOINTS

The number of points in the polygon.