Ingleborough in winter Bellarmine
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Burton-in-Lonsdale project
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Image enhancing
Grave survey
Burton-in-Lonsdale Churchyard
Image enhancing
The reading of some of the headstones was aided by the use of an image enhancing technique known as Reflection Transformation Imaging (RTI). This technique uses multiple photographs of the same image, with different angles of lighting for each image. These images are then combined using special 'RTI' software. The results can be astounding.

See: http://culturalheritageimaging.org/Technologies/RTI/
Grave 18 before RTI enhancement
grave 18
Image Alan Williams 2017
Grave 18 after RTI enhancement
grave 18
Image Alan Williams 2017
The image to the right shows work in progress for grave no. 6. The tripod to the left of the gravestone holds a billiard ball - a reflective sphere. When the lightsource is moved around the gravestone (to give differing shades from the surface of the stone) the RTI software detects the position of the lightsource by the position of its reflection on the billiard ball.

Changes in brightness on the various images show where the surface of the stone is leaning towards or leaning away from the lightsource. Multiple photos are combined, and these changes in brightness are used to infer the contours of the stone.
work in progress
Image Alan Williams 2017
email: ingleborougharchaeologygroup@gmail.com