CHSOS just added 3D scanning by Structured Light using a mini (pico) projector coupled with the “3D scanning software” developed by Daniel Moreno and Gabriel Taubin. The free software can be downloaded from Brown University School of Engineering. I need to thank Daniel for his support with the software. Pico projectors are extremely small: a fraction of the size and weight of traditional projectors. They use LEDs technology instead of lamps. They were developed for traveling professionals needing a projector that could fit into their suitcases and help them deliver presentations while traveling for meetings. The small size of these pico projectors make them suitable also for very detailed structured light 3D reconstruction. Indeed, since they are so small they can get very close to the object to be scanned and so the structured light pattern can be projected only on a small area, acquiring consequently a relatively high resolution 3D scanning.

We do run a lot of initiatives, Stay on top of things!

 

 

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AAXA P300 pico projector mounted and calibrated on a Nikon D800 and ready for structured light scanning.

 

CHSOS chose a new AAXA P300. This has the currently higher native resolution, 1280×800 pixels. Brightness is relatively low (300 lumens), but this doesn’t affect the quality of the scanning since the projector is very close to the subject (few tens of centimeters) and the lighting is, therefore, sufficient. Indeed, we want use structured light for very detailed scanning of small details. Amazing structured light 3D scanning can be realized with these projectors, such as the work done by Tim Zaman. Here is the calibration panel I made for scanning with “3D scanning software” by Daniel and Gabriel. Download check board (445 downloads)

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Pico projector and Nikon D800 are calibrated for structured light against the check board while patters are projected over the panel.

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Structured light scanning of a terracotta statue.


pigments checker v2 vsPigments Checker is for photographers, conservators and scientists interested in technical documentation of paintingss. It has 54 swatches of historical pigments designed for infrared photography, ultraviolet photography and other technical photographic methods for art examination. Check it out!

Pigments Checker is a collection of 54 swatches of his­tor­i­cal pig­ments that have been applied using gum ara­bic as a binder on a cel­lu­lose and cot­ton water­color paper, acids and lignin free. This paper is not treated with opti­cal bright­en­ers, it’s slightly UV flu­o­res­cent, and it reflects IR. Two cross-hair lines, 0,2 mm (ver­ti­cal) and 0.4 mm (hor­i­zon­tal) are printed on each swatch of paper before the appli­ca­tion of paint, in order to have a means to eval­u­ate the pig­ments’ trans­parency in the IR and IRR imag­ing. Among all the pig­ments and their vari­eties ever used in art these pig­ments col­lec­tion select the most used ones from antiquity to early 1950’.


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