MPEG-7 extensions Extensions to the MPEG-7 ontology (http://metadata.net/mpeg7) to incorporate image analysis terms including some from MATLAB. v 1.0 2006/11/06 12:56:51 slittle Image analysis measurements produced by the MATLAB Image Analysis Toolbox MatlabVisualFeature eccentricity the ratio of the distance between the foci of the ellipse and its major axis length orientation the angle (in degrees) between the x-axis and the major axis of the ellipse area Area of the region, usually measured in number of pixels convex area the number of pixels in the convex image - the smallest convex polygon that can contain the region filled area the number of 'on' pixels in the filled image major axis length the length (in pixels) of the major axis of the ellipse that has the same normalized second central moments as the region minor axis length the length (in pixels) of the minor axis of the ellipse that has the same normalized second central moments as the region equivalent diameter the diameter of a circle with the same area as the region. Computed as sqrt(4*Area/pi) euler number equal to the number of objects in the region minus the number of holes in those objects solidity the proportion of the pixels in the convex hull that are also in the region. Computed as Area/ConvexArea extent the proportion of the pixels in the bounding box that are also in the region. Computed as the Area divided by the area of the bounding box dominant color range The range of colors (increments of 10 from Darkest to Lightest color) that is most common darkest color min of the set of colors in a region lightest color max of the set of colors in a region color variation standard deviation of the set of colors in a region mean color mean or average of the set of colors in a region color range Lightest color minus darkest color in a region