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Messier 81

by Alejandro Tombolini

Introduction

Image of Sedat publicated in Image Processing Challenges - Complete description of a RGB image - Main notes: CanonBandingReduction for vertical banding, SCNR and ACDNR, HDRMultiscaleTransform and MultiscaleMedianTransform for details. Date: Apr 2012.

Processing

First a small crop to eliminate black borders.

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HistogramEqualization let you see what happens in background. There are gradients and vertical lines.

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ABE (AutomaticBackgroundExtractor)

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DBE (DynamicBackgroundExtraction)

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There are still vertical lines.

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For vertical lines rotate 90º and apply CBR (CanonBandingReduction script)

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Rotate 90º back and new DynamicBackgroundExtraction.

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Whit AberrationInspector create a new image to be used as Reference image in BackgroundNeutralization.

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With AberrationInpector create a new image to be used as Reference image in ColorCalibration and a preview of the galaxy as Reference image.

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Generate a point spread function with DynamicPSF tool and a Star Mask to be used in Deconvolution, apply protecting stars with star mask.

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HistogramTransformation.

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Generate a Luminance Mask.

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Apply SCNR (without mask)

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Apply ACDNR to Chrominance (without mask)

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ColorSaturation with Luminance Mask protecting background.

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HDRMultiscaleTransform.

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HDRMultiscaleTransform.

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New starmask to be used with MultiscaleMedianTransform.

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MultiscaleMedianTransform protecting stars with starmask.

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CurvesTransformation.

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CurvesTransformation protecting background with Blue channel.

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HistogramTransformation.

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MultiscaleMediamTransform.

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Final image:

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Last Update: 22/03/2014 15:39 UT

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