Gradient-___domain image processing: Difference between revisions

Revision as of 19:42, 14 December 2023

Latest revision as of 14:11, 16 May 2024

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== Image editing ==

The gradient is obtained from an existing image and modified for [[image editing]] purposes,. Various operators, such as [[finite difference]] or [[Sobel operator|Sobel]], can be used to find the gradient of a given image. This gradient can then be manipulated directly to produce several different effects when the resulting image is solved for. For example, if a uniform constant scales the gradient, it results in a simple sharpening filter. A better sharpening filter can be made by only scaling the gradient in areas deemed important.<ref name="Bhat2010" />

Other uses include seamless [[image stitching]],<ref>{{cite book|doi=10.1007/978-3-540-24673-2_31|chapter-url=https://webee.technion.ac.il/people/anat.levin/papers/blendingTR.pdf|chapter=Seamless Image Stitching in the Gradient Domain |title=Computer Vision - ECCV 2004 |series=Lecture Notes in Computer Science |year=2004 |last1=Levin |first1=Anat |last2=Zomet |first2=Assaf |last3=Peleg |first3=Shmuel |last4=Weiss |first4=Yair |volume=3024 |pages=377–389 |isbn=978-3-540-21981-1 }}</ref> removal of unwanted details from an image,<ref name="Perez2003">{{cite book|doi=10.1145/1201775.882269|chapter-url=https://www.cs.jhu.edu/~misha/Fall07/Papers/Perez03.pdf|chapter=Poisson image editing |title=ACM SIGGRAPH 2003 Papers on - SIGGRAPH '03 |year=2003 |last1=Pérez |first1=Patrick |last2=Gangnet |first2=Michel |last3=Blake |first3=Andrew |page=313 |isbn=1581137095 |s2cid=6541990 }}</ref> [[non-photorealistic rendering]] filters,<ref name="Bhat2010" /> image [[deblocking]],<ref name="Bhat2010" />

the ability to seamlessly clone one part of an image onto another in ways that are difficult to achieve with conventional image-___domain techniques,<ref name="Perez2003" /> and [[high-dynamic-range imaging]]<ref>{{cite book|doi=10.1145/566570.566573|chapter-url=https://www.cs.huji.ac.il/~danix/hdr/hdrc.pdf|chapter=Gradient ___domain high dynamic range compression |title=Proceedings of the 29th annual conference on Computer graphics and interactive techniques - SIGGRAPH '02 |year=2002 |last1=Fattal |first1=Raanan |last2=Lischinski |first2=Dani |last3=Werman |first3=Michael |page=249 |isbn=1581135211 |s2cid=1650337 }}</ref>