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1、matlab图像变换应用（Application of MATLAB image transformation）MATLAB image processing toolbox - regionpropsMatlab and Image 2009-12-07 14:14:39 reading 704 comment 0: large and medium subscriptionsRegionprops is a function used to measure the attributes of different regions in an image.The representation
2、is: stats=regionprops (L, properties)A series of attributes in each region of the annotation matrix L are measured. Different positive integers in L correspond to different regions, for example, L is equal to the integer 1, the corresponding region is 1; L is equal to the integer 2, the element corr
3、esponds to region 2; and so on. The return value STATS is a structure array of length max (L (:), and the corresponding field of the structure array defines the measure under the corresponding attributes of each region. Properties can be a comma separated string list, a string array full of strings,
4、 a single stringallorbasic. If properties is equal to the stringall, is a list of all the measurement data in the string will be calculated, if properties is not specified or equal tobasic, thenArea,Centroid, and attribute:BoundingBoxwill be calculated. The following list is all valid property strin
5、gs, which are case sensitive and can be abbreviated.AreaIt is scalar, and the total number of pixels in each region of the image is calculated. Note: this value may be slightly different from the value calculated by the function bwarea. For such a value, we can use it by dividing the number of pixel
6、s in the entire image region as the candidate feature of pattern recognition.BoundingBoxIt is the vector of the 1 row ndims (L) *2 column, that is, the smallest rectangle containing the corresponding region. BoundingBox is ul_corner width, ul_corner x Y Z here to. A bounding box coordinates are give
7、n in the form of the upper left corner of the boxwidth, x_width y_width. pointed out that the boundary box length along each dimension.CentroidThe vector of the 1 row ndims (L) column, and the centroid of each region (Zhong Xin) is given. Notice: the first element of Centroid is the horizontal coord
8、inate of gravity center (x coordinate), and the second element is the vertical coordinate of gravity center (Y coordinate). Centroid all other elements are arranged in the order of dimension.MajorAxisLengthIt is the length of the ellipse of the scalar, which has the same standard two order central m
9、oment as the region (in the sense of pixels). This property supports only two-dimensional annotation matrices.MinorAxisLengthIt is the length of the ellipse of the scalar, which has the same standard two order central moment as the region (in the sense of pixels). This property supports only two-dim
10、ensional annotation matrices.EccentricityIt is the eccentricity of the ellipse which has the same standard two order central moment as the region and can be used as the characteristic. This property supports only two-dimensional annotation matrices.OrientationIs a scalar, ellipse with the same stand
11、ard two order central moment and regional long axis and X axis angle (degrees). This property supports only two-dimensional annotation matrices.ImageTwo valued image, the logical matrix with the same size as a region. You can use this property to extract each sub region directly, and then do the cor
12、responding processing!FilledImageAnd the only difference is that its a logical matrix for filling! There is no difference between this case and the upper one, and only when there is a hole in the area can the difference be obvious.FilledAreaIs scalar, filling the number of on pixels in the region im
13、age.ConvexHullIt is the matrix of 2 rows of P, which contains the smallest convex polygon of a region. Each row of this matrix stores the XY coordinate of the vertex of this polygon. This property supports only 2 dimensional annotation matrices.ConvexAreaThe number of on pixels in a convex polygon i
14、mage is filled with scalars.EulerNumberScalar,A topological invariant in geometry topology - Euler number, equal to the number of objects in the image, minus the number of holes in these targets. This property supports only 2 dimensional annotation matrices. The Euler numbers in this case are 1.Extr
15、ema8 Row 2 column matrix, eight direction region extreme point. Each line of the matrix stores the XY coordinates of these points, and the vector format is top-left top-right right-top right-bottom bottom-right bottom-left left-bottom left-top. This property supports only 2 dimensional annotation matrices.EquivDiameterScalar, equivalent diameter: the diameter of a circle with the same area as that of a region. The formula is as follows: sqrt (4*Area/pi). This property only supports 2 dimensional annotation matrix. In this case, the 12 region diameter vector is normalized:SolidityScalar i
