Aug 29, 2011 - MAX_RADIUS - radius of enclosing circle around center of gravity. MIN_RADIUS ... Note that you can highlight the appropriate statistics and press CTRL-C to copy the information ... I'm trying to use roborealm to locate the brightest pixel. Does this ... I am calculating an angle from result obtained from earlier.
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Geometric Statistics The Geometric Statistics module adds a couple of image statistic variables centered around image geometry. These variables can then be used in RoboRealm conditional statement, VBScript module or exported to external programs using RoboRealm Plugins. Interface
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1. Scope - Click on the appropriate radio button to select if you want the statistics to be generated from the entire image or from an individual blob. If you select individual blobs non-black pixels in the current image will be used to form blobs. To see the statistics for an individual blob click on the blob within the main RoboRealm GUI window. That will switch the variable(x) denotation to that particular blob. Variables AREA - the number of non-black (0,0,0) pixels in the current image ANGLE - the orientation angle of the blob. This is calculated by determining the angle from the center of gravity of the blob to the furthest point from that center along the blob's perimiter. ANGLE_ALT - alternative orientation angle of the blob. This is calculated by determining the vector formed by the center of gravity to the perimiter's center of gravity. If your blob has holes in it this may be a more stable way to determine blob orientation than ANGLE. ANGLE_ALT_2 - alternative orientation angle of the blob. This is calculated by determining the average vector formed from a current perimiter point to the center
Geometric Statistics of gravity. 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
Geometric Statistics FERET_ASPECT_RATIO - FERET/BREATH BOX_ASPECT_RATIO - (MAX_X-MIN_X)/(MAX_Y-MIN_Y) WIDTH - the width of the object in pixels HEIGHT - the height of the object in pixels 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 Center of Gravity Moments of Inertia Color Statistics
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