Region Statistics

A rectangular box of image pixels is selected and some statistical values are computed from the data. The selected box may be rotated for box and ellipse regions.

N.B.: Currently the region shape is ignored and the values reflect a rectangular section of image pixels.

Notes

X and Y Projection Plot

A rectangular box of image pixels is selected and the projection along the region's X or Y axis is plotted. The sum, average or median of the projected pixels may be selected. The selected box may be rotated for box and ellipse regions.

Radial Profile

A rectangular box of image pixels is selected and the pixels values are plotted against their respective radii. A Gaussian is fit to the radial profile data and the result is also plotted. The fitted results of the 4 parameter fit are displayed with the plot. The selected box may be rotated for box and ellipse regions.

The center pixel from which the radii are computed is determined from the background subtracted centroid taken about the brightest 9 pixels in the data (same centroid as is displayed in the region stats plugin).

Pixel Value Histogram

A rectangular box of image pixels is selected and a histogram of the values is plotted. The selected box may be rotated for box and ellipse regions. The selected pixels are binned into 250 bins between the minimum and maximum value found in the selected region.

Encircled Energy

A rectangular box of image pixels is selected and background subtracted. The analysis radius is determined from the region as follows: The values within the analysis radius are binned in 1 pixel radial bins. The bins are normalized by the sum of all pixels and the result is plotted.

The background is obtained as the median from the outer 4 pixel wide perimeter of the selected region.

The center pixel from which the encircled energy is computed is determined from the background subtracted centroid taken about the brightest 9 pixels in the data (same centroid as is displayed in the region stats plugin).

The 50 and 80 percent encircled energy points are displayed over the plot.

3d Surface Plot

A rectangular box of image pixels is selected and plotted as a surface. The selected box may be rotated for box and ellipse regions.