elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayEllipticAxisGrayelliptic_axis_gray (算子)

名称

elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayEllipticAxisGrayelliptic_axis_gray — 计算灰度图像中区域的方向和长轴。

elliptic_axis_gray(Regions, Image : : : Ra, Rb, Phi)

算子 elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayEllipticAxisGrayEllipticAxisGrayelliptic_axis_gray calculates the length of the axes RaRaRaRarara and RbRbRbRbrbrb and the orientation PhiPhiPhiPhiphiphi of the ellipse having the “same orientation” and the “aspect ratio” as the input region in RegionsRegionsRegionsRegionsregionsregions. Therefore, gray value moments which are derived from the ImageImageImageImageimageimage are used. Several input regions can be passed in RegionsRegionsRegionsRegionsregionsregions as tuples. The length of the major axis RaRaRaRarara and the minor axis RbRbRbRbrbrb as well as the orientation of the major axis with regard to the x-axis (PhiPhiPhiPhiphiphi) are determined. The angle is returned in radians. The calculation is done analogously to elliptic_axiselliptic_axisEllipticAxisEllipticAxisEllipticAxiselliptic_axis。The only difference is that in elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayEllipticAxisGrayEllipticAxisGrayelliptic_axis_gray the gray value moments are used instead of the region moments. For the definition of the gray value moments, see area_center_grayarea_center_grayAreaCenterGrayAreaCenterGrayAreaCenterGrayarea_center_gray。

Note, that in the case where the gray value area is zero the length of the axes RaRaRaRarara and RbRbRbRbrbrb as well as the orientation PhiPhiPhiPhiphiphi are also set to zero.

Note that the operator elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayEllipticAxisGrayEllipticAxisGrayelliptic_axis_gray only considers the given RegionsRegionsRegionsRegionsregionsregions and ignores any previously set domain of the input image ImageImageImageImageimageimage。