Note: The spot pairs are at an angle, and the higher footpoint
has an opposite polarity as the hemisphere it's in.
Second, in each camera FOV, based on the detection results, FootPoint tracking is done by utilizing Kalman Filter and Hungarian data association algorithm  to improve the performance of track association.
As each detected person is represented by a FootPoint position, so a FootPoint position can belong to one of the positions of the detection grid where G(x, y)=1.
The heat conduction heats the footpoint portion of a loop which is dense, and the heated plasma expands upward and fills the loop.
27) We may imagine a picture in which a plasma heated to T > 2 MK and has a broader nonthermal line width comes up from the loop footpoint region and then cools to T [approximately equal to] 1 MK and falls down.
Vrubliauskas, "Mathematical methods for determining the footpoint
of the arterial pulse wave and evaluation of proposed methods", Information on Technology and Control, vol.
On camera, red plasma flows into the loop from one footpoint
while blue plasma simultaneously flows into the loop from the other end.
The scientists suggested that the upflow of gases is probably the result of "impulsive heating" close to the footpoint
regions of the loops.
The corona's heat comes from energy released as the spaghetti tries to untangle itself, while the footpoint
motion continues to stir it up.
The magnetic fields arch up from a footpoint
of one polarity and then descend to another of opposite polarity -- sometimes tens of thousands of kilometers away.
In this low-density region, where charged particles encounter relatively few atoms, electrons and protons can travel unimpeded down a long loop, brilliantly illuminating each footpoint
, as the Yohkoh pictures illustrate.
The authors suggest such flares result from what amounts to an explosion--"the sudden creation of a high-pressure region at the footpoint
of a coronal loop.