other:dsx:x4d:4d_optimization
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| other:dsx:x4d:4d_optimization [2024/07/12 13:56] – created sgranger | other:dsx:x4d:4d_optimization [2024/07/17 15:44] (current) – created sgranger | ||
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| - | {{X4D_4DOptimizationDialog.png}} | + | {{:X4D_4DOptimizationDialog.png}} |
| 4D optimization tracks one or more objects by solving all frames in the tracking range at the same time. It works using a simulated annealing optimization process over two passes. In the first pass, a temporary pose map is created by evaluating the object’s pose map over the tracking range at equal time stamps. The object poses at these times are the control points that the optimizer varies to find the global solution. The spacing between the time stamps is determined by the //Frame Spacing (Pass 1)// parameter. For example, if the parameter is set to 4 and there are 20 reporting times in the tracking range, there will be 20 / 4 + 1 = 6 poses in the pose map-- a pose at each end of the range and 4 poses equally spaced between them. The algorithm then proceeds to optimize each control point independently of the others, while evaluating the DRR/X-ray matching for the X-ray frames in the neighborhood of the control point. The size of this neighborhood is determined by the //Frame Envelope (Pass 1)// parameter. For example, if the parameter is set to 2, each time the optimizer changes the pose at one of the time stamps, it will evaluate the DRR/X-ray matching at the closest X-ray frame to that time (in each view), and in the 2 frames on either side of that closest frame. A value means to evaluate only the closest X-ray frame. | 4D optimization tracks one or more objects by solving all frames in the tracking range at the same time. It works using a simulated annealing optimization process over two passes. In the first pass, a temporary pose map is created by evaluating the object’s pose map over the tracking range at equal time stamps. The object poses at these times are the control points that the optimizer varies to find the global solution. The spacing between the time stamps is determined by the //Frame Spacing (Pass 1)// parameter. For example, if the parameter is set to 4 and there are 20 reporting times in the tracking range, there will be 20 / 4 + 1 = 6 poses in the pose map-- a pose at each end of the range and 4 poses equally spaced between them. The algorithm then proceeds to optimize each control point independently of the others, while evaluating the DRR/X-ray matching for the X-ray frames in the neighborhood of the control point. The size of this neighborhood is determined by the //Frame Envelope (Pass 1)// parameter. For example, if the parameter is set to 2, each time the optimizer changes the pose at one of the time stamps, it will evaluate the DRR/X-ray matching at the closest X-ray frame to that time (in each view), and in the 2 frames on either side of that closest frame. A value means to evaluate only the closest X-ray frame. | ||
other/dsx/x4d/4d_optimization.1720792566.txt.gz · Last modified: 2024/07/12 13:56 by sgranger