Abstract super type for source detection algorithms used with
PeakMesh(box_size=(3, 3), nsigma=3.0)
Detect sources by finding peaks above a threshold in grids across the image.
This creates a pixel-wise threshold for sources by calculating
error * nsigma when used with
extract_sources The peaks are found by searching the image in boxes of size
box_size. If the maximum value in that box is greater than the threshold set above, the point is extracted.