Old Cambridge Burial Ground IR and a little photogrammetry

[Andy Perrin]

I was in Harvard Square not long ago and I took an 850nm IR pic.

 

Camera: NEX-7 full spectrum

Filters: DB850 + Hoya R72

Lens: Sony FE 55mm/1.8

 

1/160" ISO400 F/6.5

 

Visible light pic

Camera: Sony A7III (unconverted)

Lens: Sony FE GM 24mm/1.4

 

 

I have also been working for quite some time on a method for reading faded gravestones using photogrammetry, which I should probably write up for you all in more detail sometime soon, but you can have a sneak peek at the end result. This was done using visible light photos (the reason for the IR above was actually to test the potential for using IR to do the photogrammetry, but it actually turned out to work better in visible light).

 

 

 

[dabateman]

Great work Andy. 

Amazing,  she passed away 18 years before the United States was born.

 

[Andy Perrin]

 

6 minutes ago, dabateman said:

Amazing,  she passed away 18 years before the United States was born.

 

And far from the oldest grave I've seen, even in that cemetery. I have unprocessed pics of another stone from 1654, 122 years before the United States...

[Nate]

That's great work, curious the technique, maybe multiples with shadows merged?

 

I see the sun has come out there too for a bit, pretty gloomy spring around here.

[colinbm]

Excellent result Andy.
One of my hobbies is genealogy & local histories, so I am interested in the method.

 

[Andy Perrin]

35 minutes ago, Nate said:

That's great work, curious the technique, maybe multiples with shadows merged?

 

I see the sun has come out there too for a bit, pretty gloomy spring around here.

Not even remotely close. It's not a photograph at all, it's a form of 2D rendering from a 3D model! So there is no light involved here. It's an enhanced depth map. Deeper carvings are shaded darker, but non-linearly.

[Nate]

38 minutes ago, Andy Perrin said:

Not even remotely close. It's not a photograph at all,

Interesting, turned out great.

[Doug A]

Your technique really enhances the details. Neat to see history restored.

Thanks for sharing,

Doug A

[photoni]

good job Andy