Background on images - Revision history

Ana.Lalovic at 11:37, 10 November 2023

2023-11-10T11:37:42Z

Ana.Lalovic at 11:37, 10 November 2023

2023-11-10T11:37:14Z

Ana.Lalovic: Created page with " mask = segmentation_map > 0 # Sextractor's segmentation mask with DETECT_THRESH = 1. and ANALYSIS_THRESH = 1. bkgmask = (data == 0.0) # Mask of the outer parts of the im..."

2023-11-10T11:28:15Z

Created page with " mask = segmentation_map > 0 # Sextractor's segmentation mask with DETECT_THRESH = 1. and ANALYSIS_THRESH = 1. bkgmask = (data == 0.0) # Mask of the outer parts of the im..."

New page

mask = segmentation_map > 0 # Sextractor's segmentation mask with DETECT_THRESH = 1. and ANALYSIS_THRESH = 1.
bkgmask = (data == 0.0) # Mask of the outer parts of the image without data (blank part)
mesh_size=[50, 100, 150, 200, 300, 500]
percent = [1, 7, 10, 15, 25, 26]
sigma_clip = SigmaClip(sigma=3.)
bkg_estimator = MedianBackground()
bkg = Background2D(data, (mesh_size, mesh_size), filter_size=(5, 5),mask=mask,coverage_mask=bkgmask,sigma_clip=sigma_clip,bkg_estimator=bkg_estimator,exclude_percentile=percent,fill_value=0.0)

Left: background_model Middle: Meshes drawn on the background subtracted image Right: Smoothed bkg subtracted image with Gaussian stdev=5
[[Image:icl50.png]]

[[Image:icl100.png]]

[[Image:icl150.png]]

[[Image:icl200.png]]

[[Image:icl300.png]]

[[Image:icl500.png]]

== Background from boxes (1D) ==

Background is the mean value from boxes 32 x 32 pix large, inside which all objects are masked. Also, the mean standard deviation is estimated from the boxes. There are several cases plotted in the radial profile plot:
* bkg = image - mean,
* bkg1m = image - (mean-stdev),
* bkg1p = image - (mean+stdev)
* base = image
* iclsub[mesh_size]

[[Image:boxes.png|300px|]][[Image:RP_zoom.png|600px|]]

← Older revision		Revision as of 11:37, 10 November 2023
Line 8:		Line 8:

	Left: background_model Middle: Meshes drawn on the background subtracted image Right: Smoothed bkg subtracted image with Gaussian stdev=5 (icl100.png)		Left: background_model Middle: Meshes drawn on the background subtracted image Right: Smoothed bkg subtracted image with Gaussian stdev=5 (icl100.png)
		+	[[Image:icl100.png]]

@@ Line 7: / Line 7: @@
   bkg = Background2D(data, (mesh_size, mesh_size), filter_size=(5, 5),mask=mask,coverage_mask=bkgmask,sigma_clip=sigma_clip,bkg_estimator=bkg_estimator,exclude_percentile=percent,fill_value=0.0)
-Left: background_model Middle: Meshes drawn on the background subtracted image Right: Smoothed bkg subtracted image with Gaussian stdev=5
+Left: background_model Middle: Meshes drawn on the background subtracted image Right: Smoothed bkg subtracted image with Gaussian stdev=5 (icl100.png)
 == Background from boxes (1D) ==