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The radiographs can be combined optically using an optical instrument termed a stereoscope, although these tend to be expensive and the resulting image is limited in size. Another way to combine the images is to create red-green stereo pairs. Here, the radiographs are scanned and placed into different layers of colour image: one radiograph for the red layer, the other for the green. It is important to align the images where the overlap occurs. When the image is viewed using glasses fitted with one red and one green lens, the red image is seen by the eye which is covered by the red fitter and the green image is seen by the eye covered by the green filter.

The filtering element is just a simple array of numbers which, in part, defines how the filter works. This type of processing is localized in that the result depends only on the value of neighbouring pixels. For example, a 3 ϫ 3 filtering element is 3 pixels wide, 3 pixels high, and the result is returned to the middle pixel. The simplest spatial filters blur or sharpen an image, as one might alter the focus of a camera lens. Blurring involves the simple averaging of the neighbouring pixels and is suitable for removing noise from an image, although this also tends to remove detail as well.

17, The Small Finds, Council for British Archaeology, London 2 Radiographic images Janet Lang, Andrew Middleton, Janet Ambers and Tony Higgins Methods of recording radiographic images, film, X-ray paper, Xeroradiography, fluoroscopy, digital radiography; image quality; image processing; stereoradiography; computed tomography; practical radiography, image quality; problems; setting up and running a radiographic facility RECORDING RADIOGRAPHIC IMAGES As X-rays cannot be perceived by eye, the X-ray image must be registered on a suitable material to make it visible.

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