Hi Another option can be to use e.g. ImageJ and compute fractal dimensions of the outline.
Petr > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Jim Lemon > Sent: Friday, March 07, 2014 12:04 PM > To: Violette BERTRAND > Cc: r-help@r-project.org > Subject: Re: [R] shapes of woodpeckers' cavities > > On 03/07/2014 08:51 AM, Violette BERTRAND wrote: > > Hi, > > > > I have pictures (.png) of the shape of many entrances of woodpeckers’ > cavities, coloured in black. I want that R takes these pictures and > stacks (superimposes) all the shapes to determine the tendency of the > shape of cavities for each species of woodpecker. > > > > I currently use the package EBImage which determine the mean radius > of the shape of entrances (the shape is divided in 8 parts, and the > package measure the mean radius for each part). So this package uses > only the mean radius for each part of the shape. > > > > But, I would like that R use the real shape of cavities. Is another > package exists, which will use the real shape of my pictures ? > > > Hi Violette, > I think that this is more of a graphics manipulation. You can get the > outline of the woodpecker hole by: > > 1) loading your image into the GIMP > 2) duplicating it > 3) scaling the duplicate down by about 2.5% > 4) select the area using "similar colors" > 5) bucket fill the selected area with white > 6) copy the selected area > 7) paste it onto the original image > > You will then have the outline as in the image attached. I don't know > whether the GIMP will do it, but there are image compositing functions > that will produce an average of many images. There you have your > average woodpecker hole. > > Jim ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a jeho kopie vymažte ze svého systému. Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat. Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi či zpožděním přenosu e-mailu. V případě, že je tento e-mail součástí obchodního jednání: - vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření smlouvy, a to z jakéhokoliv důvodu i bez uvedení důvodu. - a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně přijmout; Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí nabídky ze strany příjemce s dodatkem či odchylkou. - trvá odesílatel na tom, že příslušná smlouva je uzavřena teprve výslovným dosažením shody na všech jejích náležitostech. - odesílatel tohoto emailu informuje, že není oprávněn uzavírat za společnost žádné smlouvy s výjimkou případů, kdy k tomu byl písemně zmocněn nebo písemně pověřen a takové pověření nebo plná moc byly adresátovi tohoto emailu případně osobě, kterou adresát zastupuje, předloženy nebo jejich existence je adresátovi či osobě jím zastoupené známá. This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients. If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system. If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner. The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email. In case that this e-mail forms part of business dealings: - the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning. - if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation. - the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects. - the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
