We introduce a technique for improving photographs using inverse lighting, a new process based on algorithms developed in computer graphics for computing the reflection of light in 3D space. From a photograph and a 3D surface model for the object pictured, inverse lighting estimates the directional distribution of the incident light. We then use this information to process the photograph digita...

I detail a method for producing high quality Fourier transform holograms using a computer, laser printer, and overhead transparency film. The method should be useful for lecture demonstration and holography laboratories. Given an arbitrary holographic phase/amplitude plate, computer-generated holography attempts to find a suitable binary encoding of the (complex) transmission function of the ho...

Users and the context of use are the heart of user-centred design. If the users’ tasks are irregular or varying the information gathering is difficult. In our study we used photography based artefact analysis to gather information about these kinds of problematic situations. The combination of artefact analysis and participative observations proved to be a practical and viable solution. In this...

Sir, Clinical photography enhances medical records and is essential for the daily practice of surgeons. Important uses of photographs include patient counselling, audit, publications, education, medico-legal work and for planning treatment without repeatedly redressing the wound. The value of such photographs are realised when they are needed, no doubt we have all been painfully aware of this w...

A new technique that enables frequency-resolved cavity ringdown absorption spectra to be obtained over a large optical bandwidth by a single laser shot is described. The technique, ringdown spectral photography (RSP), simultaneously employs two key principles to record the time and frequency response of an optical cavity along orthogonal axes of a CCD array detector. Previously, the principles ...

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This year nearly coincides with the centenary of the invention of Photography, and is the actual centenary ?f the first negative which is still in existence ; and hearing in mind the great strides which have been made in photography in connection with Medicine, I consider that it would not be out of place to trace the history of this process from its inception, dealing particularly in the later...