History[ edit ] Spirit photography was first used by William H. Mumler in the s. Seeing there was a market for it, Mumler started working as a medium , taking people's pictures and doctoring the negatives to add lost loved ones into them mostly using other photographs as basis. Mumler's fraud was discovered after he put identifiable living Boston residents in the photos as spirits. A spirit photograph taken by William Hope Other spirit photographers also started to sell photographs. A later spirit photographer was Fred A.
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Light-field camera Digital methods of image capture and display processing have enabled the new technology of "light field photography" also known as synthetic aperture photography. This process allows focusing at various depths of field to be selected after the photograph has been captured. These additional vector attributes can be captured optically through the use of microlenses at each pixel point within the 2-dimensional image sensor. Every pixel of the final image is actually a selection from each sub-array located under each microlens, as identified by a post-image capture focus algorithm. Devices other than cameras can be used to record images.