<?xml version="1.0"?>
                <!DOCTYPE article PUBLIC "-//NLM//DTD Journal Publishing DTD v3.0 20080202//EN" "journalpublishing3.dtd">
                <article article-type="research-article">
                <front>
                    <journal-meta>
                    <journal-id journal-id-type="publisher-id">cic</journal-id>
                    <journal-title>Color and Imaging Conference</journal-title>
                    <abbrev-journal-title>color imaging conf</abbrev-journal-title>
                    <issn pub-type="ppub">2166-9635</issn><issn pub-type="epub">2166-9635</issn>
                    <publisher>
                        <publisher-name>Society for Imaging Science and Technology</publisher-name>
                        <publisher-loc>IS&amp;T 7003 Kilworth Lane, Springfield, VA 22151 USA</publisher-loc>
                    </publisher>
                    </journal-meta>
                    <article-meta>
                    <article-id pub-id-type="doi">10.2352/CIC.2022.30.1.29</article-id>
                    <article-id pub-id-type="publisher-id">29</article-id>
                    <article-categories>
                        <subj-group>
                        <subject>Regular Article</subject>
                        </subj-group>
                    </article-categories>
                    <title-group>
                        <article-title>The Regularised Epsilon-derivative for Image Reintegration</article-title>
                    </title-group><contrib-group content-type="all"><contrib contrib-type="author"><name>
                            <surname>Finlayson</surname>
                            <given-names>Graham </given-names>
                           </name> <xref ref-type="aff" rid="aff1author1"/></contrib><aff id="aff1author1">University of East Anglia, UK</aff></contrib-group><contrib-group content-type="all"><contrib contrib-type="author"><name>
                            <surname>Drew</surname>
                            <given-names>Mark </given-names>
                           </name> <xref ref-type="aff" rid="aff2author2"/></contrib><aff id="aff2author2">Simon Fraser University, Canada</aff></contrib-group><abstract>
                    <title>Abstract</title>
                    <p>Many image-editing tasks are carried out in the gradient domain. Suppose that for an image I the gradient &amp;nabla;I consists of a pair of fields (p;q); then some image “reintegration” scheme is tasked with converting derivative fields (p;q) back to imagespace I; typically, a Poisson equation solver is used for this task. But what if we have altered (p;q) so that this pair (p;q) is no longer integrable? Then we have to project onto integrable gradient data that will indeed reintegrate to an approximation of the original image. For example, we may wish to alter (p;q) so as to emphasize or de-emphasize some aspects of the image, e.g. ameliorating wrinkles in skin images (or indeed enhancing them in the case of ageing a face image).

Here, we propose a new gradient kernel that retains part of the original image, regularising the reintegration back into the image domain. We compare our approach with the Screened-Poisson method which includes a term &amp;lambda; times a “screen” term that moves the solution image back closer to the input image. Effectively, we are doing a similar adjustment, but we show that the results are a good deal better than using Screened-Poisson, which tends to overly blur the output. Moreover, in Screened-Poisson one must choose a value for &amp;lambda;, which may be different for every image – here we determine that our new kernel method does not need to adapt to each image yet delivers comparable or better results.</p>
                    </abstract><pub-date>
                        <day>15</day>
                        <month>11</month>
                        <year>2022</year>
                        </pub-date><volume>30</volume>
                    <issue-acronym></issue-acronym>
                    <issue-title>30th Color and Imaging Conference</issue-title>
                    <issue>1</issue>
                    <fpage>159</fpage>
                    <lpage>164</lpage>
                    <permissions>
                         <copyright-statement>©2022 Society for Imaging Science and Technology</copyright-statement>
                        <copyright-year>2022</copyright-year>
                    </permissions><kwd-group><kwd>image reintegration</kwd><kwd>screened Poisson</kwd><kwd>regularized gradient kernel</kwd><kwd>image smoothing</kwd></kwd-group></article-meta>
                </front>
                </article>