Direction bounding box cross area determination method

Abstract

The invention discloses a direction bounding box cross area determination method. The method comprises the following steps: 1) obtaining shape parameters and position parameters of a predicted envelope frame rect0 and an actual envelope frame rect; 2) according to the shape parameters and the position parameters of the prediction envelope frame rect0 and the actual envelope frame rect, determiningthe intersection category of the prediction envelope frame rect0 and the actual envelope frame rect; 3) if the predicted envelope frame rect0 is not intersected with the actual envelope frame rect, determining that the cross area is 0; if the predicted envelope frame rect0 is intersected with the actual envelope frame rect0 and the center of the rect0 is in the rect0, turning to the step 5), otherwise, turning to the step 4); 4) decomposing rect0 into four small rect1; (5) decomposing rect0 into four small rects, and (6) calculating the shape parameters and the position parameters of the foursmall rects, and then calculating the cross area of each small rect and the corresponding rect to obtain a total cross area value. The direction bounding box cross area determination method is rapidin calculation speed and high in prediction accuracy.

Description

technical field [0001] The invention relates to image recognition technology, in particular to a method for determining the intersection area of ​​a direction bounding box. Background technique [0002] The object envelope commonly used in the field of target detection is AABB (Axis Aligned Rectangular Bounding Box). For the detection of some slender objects, the effective area contained in the AABB envelope is too small, which is not conducive to subsequent analysis. Using the OBB direction bounding box (orientation bounding box) to envelop the target object can greatly improve the effective area in the envelope box. For the intersection of OBB, see figure 1 . It is a mainstream method today to use the intersection area ratio (referred to as IOU) of the predicted envelope box and the actual envelope box to characterize the effect of the predicted box. In view of the fact that the analytical equation solution of OBB's IOU calculation is too complex, and the equation contai...

AI Technical Summary

Problems solved by technology

In view of the fact that the analytical equation solution of OBB's IOU calculation is too complicated, and the equation contains a large number of piecewise functions, it is not conducive to backpropagation, resulting in poor convergence of the overall model

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