Showing posts with label forensic anthropology. Show all posts
Showing posts with label forensic anthropology. Show all posts

Tuesday, 12 March 2013

Homo floresiensis - 3D forensic facial reconstruction of the "hobbit"

Second Wikipedia:

Homo floresiensis ("Flores Man", nicknamed "hobbit" and "Flo") is a possible species, now extinct, in the genus Homo. The remains of an individual were discovered in 2003 on the island of Flores in Indonesia. Partial skeletons of nine individuals have been recovered, including one complete cranium (skull).These remains have been the subject of intense research to determine whether they represent a species distinct from modern humans, and the progress of this scientific controversy has been closely followed by the news media at large. This hominin is remarkable for its small body and brain and for its survival until relatively recent times (possibly as recently as 12,000 years ago).


Some months ago a forensic facial reconstruction of the "hobbit" was presented in the web.


I liked very much of this and decided create a version to a exposure about human evolution that will happen here in Brazil.


I was not able to find a 3D reconstructed skull on the web, but fortunately I found two ortogonal rotating video in this link: www-personal.une.edu.au/~pbrown3/ (thank you mr. Peter Brown!)

To reconstruct the skull I converted the videos in a image sequence with FFMPEG:

$ ffmpeg -i Input_video.avi -sameq Output_directory/%04d.jpg

After that I imported ten images in Inkscape and I converted the bitmap in vector (Shift + Alt +B).





So, I placed the "slices" in their positions, and I made a extrusion by rotating.

With this I had the basic shape of the skull to continue, this time, with the sculpting process.



If you wanna see the entire process, please look this album: http://plus.google.com/photos/115430171389306289690/albums/5853884703716365057

If you wanna download the .ply file, visit this link:


I cannot forget to thank Dr. Paulo Miamoto to help me with the modeling of the teeth.

I hope you enjoy.

A big hug and I see you in the next!


Sunday, 10 March 2013

Homo habilis - forensic facial reconstruction step-by-step (screenshots)

Last but not least, I finished the reconstruction of a Homo habilis to be exposed at an event about human evolution in May 2013.

I chose to close with this model because I saw an opportunity to test a new methodology.


Upon receiving the skull reconstructed by Prof. Dr. Moacir Elias Santos, it was evident that besides not being very symmetrical parts were missing.


To harmonize the view without losing data, was enough to mirror the object in the X axis But there was still part of the zygomatic arches, and jaw.


Through deformation via Edit Mode (Blender 3D) with Connected activated, it was possible to deform the skull of a chimpanzee until it to conform with the model scanned and imaged.


The details of the reconstruction can be seen in an album I created in Picasaweb:


Follow the step-by-step via screenshot and see how the work was produced, starting in the import of the skull and ending in the final render.

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These hominids reconstructions are "sons" of Taung Project.

It is a group work by internet in Italy and Brazil.

So, I have to thank some people to make this project possible:

Alesandro and Luca Bezzi (IT)
Giuseppe Naponiello (IT)
Arc-Team (IT)
Moreno Tiziani, Antrocom (IT)
Dr. Nicola Carrara (IT)
Antropological Museum of Padua (IT)
Prof. Dr. Moacir Elias Santos (BR)
Vivian Noitel Valim Tedardi (BR)

Thank you very much!


Saturday, 12 January 2013

Australopithecus afarensis - forensic facial reconstruction

The Australopithecus afarensis was an hominid that lived between 4 and 2 millions of years past.


They had biped behavior and the appearence of apes.


In this post I'll talk about my little adventure to reconstruct the face of this specie. 

This work is a type of continuation of Taung Project, because the knowledge used there was tapped here, with some increase of the technic.

I have to thank to Moacir Elias Santos, a Brazilian archaeologist that took a serie of pictures of a cast skull on Museu Egipcio e Rosacruz.


 The skull used was reconstructed with PPT GUI (scanning by picture).


To increase the quality of the reconstruction, I used a CT-Scan of a chimpanzee.




 The skull of chimp was deformed using Lattice modifier on Blender 3D, until match with the Australopithecus skull. Obviously, the skin was deformed too.


After this, I used the reference of the deformed skin to modeling the final face.


  The following steps were the same explained in other posts.

I hope you enjoyed.

A big hug!

Wednesday, 9 January 2013

From Youtube to Blender: Forensic facial reconstruction of a child mummy



This post is about a practical application of a serie of studies published here in this blog.

After I started to study about forensic facial reconstruction I saw that is much more easy to find videos of CT-Scan than the DICOM files and other tomography formats.

A way to convert a video in a reconstructed mesh was described here.

Some days ago I was reading about mummies (desperate to find a CT-Scan) and I found this post:


It talks about a child mummy of St. Louis, that lived in a range of 40 BC and 130 AD. He died with 7 or 8 months.

Inside the matter had a video with some seconds of a CT-Scan slicing. I was able to convert it in a reconstructed mesh, and after I found a video on Youtbe with more qualty and I used it to make the final mesh, used in this post.



I downloaded the video with Videodownload Helper (Firefox) and it was converted in a image sequence and after in a serie of DICOM files.

Unfortunately I lost the original vetorial file and now we have only the infographic in Portuguese version, like you can see below (but it have a lot of images, that dispensing you to read it).


To make a reconstruction with historical and archaeological foundation I had the help of Moacir Elias Santos, archaeologist of the Egypt Museum and Rosacruz, from Brazil.


The animated gif above shows the extracted frames of the animation converted into a CT-Scan. I reduced the slices to make it more didatic.






I had a serie of dificulties to find landmarks to use on the child's face, cause appear that it doesn't exist. So I use a average of 3-8 year and rescale it to have at least a reference.

I use a serie of babies pictures to draw the line of the neck and ears.


Moacir sent me a compose image with the original mummy, that you can see below.



I hope you enjoy this post. I see you in the next. A big hug!

Wednesday, 11 July 2012

The digitization and fruition of fossil specimens: benefits and consequences



In anthropology, the possibility to reconstruct the features of individuals from their skeletal remains has facilitated and encouraged the forensic anthropology and the bioarchaeology. Besides, it made room to paleoanthropology (above all the paleoneurology), when this option is not applied to the reconstruction of a face, but of the specimen itself.

Why to use a three-dimensional reconstruction of a skeletal specimen? We must consider, in particular, that the paleoanthropological fossils are of great value (not only from the scientific point of view) because these objects are often unique and they can not be handled too frequently to avoid irreparable damages.

Being unique objects, they are rare, and thus the access to them is not easy. And being very old, they need special conditions, monitored constantly to preserved them as best as possible. To move them would be largely a risk. There is also another aspect linked to their uniqueness: the fact that the paleoanthropological fossils are often preserved in places far away and that only a lucky few people can go there.

A three-dimensional reconstruction not only avoids facing a long journey, but also allows you to avoid frequent handling, perhaps hasty, and changes in storage conditions. Moreover, the reconstructions based on detailed scans of the specimens allow measurements much more accurate than if done manually.

Interview to Christoph Zollikofer (Zurich University)

The advantages of such applications are therefore evident and their spread is certainly to be encouraged, especially if the resulting data are shared as much as possible.

When the access to the specimen is severely limited for a variety of reasons and maybe years must pass before you see photos and measurements, the advancement of the discipline is also limited. Data sharing carries in itself another advantage: the discussion between researchers annuls, in this way, the possibility of more or less dubious interpretations by a minority of them. Perhaps the same few people who had access to the specimen.

Also, if data sharing takes place through free software, analysis of the specimen is enhanced by new data and interpretations, in a cascade process that feeds itself. Incidentally, the word "free", in this context, means generically a software to which all those who wish can access, anytime they want. Of course, the freedom of access should be subordinated to the ability to use the software itself.

It's true that an access of this scale and with these tools would lead to consequences of a certain depth both economically and socially. As is the case of goods production, more copies of an object there are, the more its market value is lowered. A unique object becomes, in this way, a commodity.

Following these considerations, an object that is cheap is considered of little value, even on the intrinsic meaning. There is therefore a risk that the specimen, though important, is losing its value in the eyes of one of those visitors came from afar to view it. If not in the eyes of the researchers themselves.

We must not forget that these findings are part of the cultural and scientific heritage of the countries where they were discovered. Often these are developing countries (I think for example to African countries where the most part of fossils of hominids was found) and for these the specimen may mean different possibilities: visibility at the international level, negotiating power, source of income for local populations through the related activities that is generated by the discovery and subsequent museification.

The computerization and the data sharing therefore untie the specimen from its being also a political and economic tool. How much these aspects are taken into account in the process of digitization of specimens and, in general, of data stores? And what can we do to stem the problem, if not to remedy it?

At present, in the absence of specific legislative actions, everyone must rely on his own sense of ethics.
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