Enblend

{{short description|Software tool for merging images}} {{Infobox software | name = | logo =  | logo alt = | logo caption = | screenshot =  | screenshot size = | screenshot alt = | caption = | collapsible =  | author = Andrew Mihal | developer = Hugin team (Christoph Spiel) | released =  | discontinued =  | ver layout =  | latest release version = {{wikidata|property|preferred|references|edit|P348|P548=Q2804309}} | latest release date = {{Start date and age|{{wikidata|qualifier|preferred|single|P348|P548=Q2804309|P577}}|df=yes}} | repo =  | programming language = C++ | engine =  | operating system = Cross-platform | platform = | included with = | size = | language = English | language count =  | language footnote = | genre = | license = GNU GPL 2+ | alexa = | website =  | standard = | AsOf = }} '''Enblend-Enfuse''' are open source console application created by Andrew Mihal and mostly maintained by Hugin developers. It consists of Enblend, an image blending tool useful for creating panoramas, and Enfuse, an exposure fusion (HDR merging) and focus stacking tool that combines the depth of field and dynamic range from multiple images of the same scene (bracketing). Enblend-enfuse accepts images already aligned by other methods.<ref name=DOC>{{cite web |last1=Mihal |first1=Andrew |last2=Spiel |first2=Christoph |title=Combining Multiple Images with Enfuse 4.2 |url=https://enblend.sourceforge.net/enfuse.doc/enfuse_4.2.xhtml/enfuse.html |website=enblend.sourceforge.net |accessdate=11 May 2019}}</ref>

== Technique == Enblend uses the Burt-Adelson spline for blending.<ref>{{cite journal |last1=Burt |first1=Peter J. |last2=Adelson |first2=Edward H. |title=A multiresolution spline with application to image mosaics |journal=ACM Transactions on Graphics |date=1 October 1983 |volume=2 |issue=4 |pages=217–236 |doi=10.1145/245.247 |s2cid=316610 |url=http://persci.mit.edu/pub_pdfs/spline83.pdf}}</ref>

Enfuse uses the Mertens-Kautz-Van Reeth (MKVr) approach to exposure fusion, which does not require reconstructing an HDR intermediate. The MKVr approach involves blending images by quality estimates based on contrast, saturation, and well-exposedness.<ref name=Mertens>{{cite journal | title = Exposure Fusion | url = https://mericam.github.io/exposure_fusion/index.html | year = 2007 | journal = Pacific Graphics | last1 = Mertens | first1 = Tom | last2 = Kautz | first2 = Jan | last3 = Van Reeth | first3 = Frank | accessdate = 2011-01-21 | archive-date = 2019-05-11 | archive-url = https://web.archive.org/web/20190511084855/https://mericam.github.io/exposure_fusion/index.html | url-status = dead }}</ref> Enblend extends the estimate with a fourth term of information entropy, and allows the user to decide the weights of each quality estimator as well as specific implementations of the estimators. For example, a basic focus stack is combined in Enfuse by having the quality estimator only consider contrast, and by having the MKVr blending only use the single best-scoring pixel.<ref name=DOC/>

== Frontends ==

Enfuse is used in a number of other tools: * Hugin, an open-source panorama tool, uses Enblend-Enfuse for blending and HDR handling. Hugin provides align_image_stack, which aligns images so that Enfuse can process them. * EnfuseGUI, an open source multi-processor GUI for enfuse mainly focused on HDR merging.<ref>{{cite web |title=EnfuseGUI |url=http://software.bergmark.com/enfuseGUI/Main.html |website=software.bergmark.com}}</ref> * MacroFusion, another open source GUI for enfuse.<ref>{{cite web|author=|url=https://sourceforge.net/projects/macrofusion/|title=MacroFusion: GUI to combine photos to get deeper DOF or HDR|publisher=sourceforge.net |date= 27 November 2016|accessdate=2017-10-19}}</ref> * [https://gpstamper.com/enfusion Enfusion], another Windows GUI for Enfuse, with a focus on simplicity.

== References == {{reflist}}

Category:Free photo stitching software Category:Free software programmed in C++ Category:Software using the GNU General Public License Category:Cross-platform free software