Image quality enhancement technique for colour light intensifiers - uses disordered arrangement of luminous phosphor receptors to prevent Moire fringe image patterning

摘要

Light (22) is incident on a regular matrix of coloured filters (11) behind which a bank of fibre-optic couplers (14) transmits it, in spatially filtered form, to a photocathode (15). A row of micro-channel photomultipliers (17) generates an electron beam replica of the light signal which is incident on an adjacent luminescent-phosphor screen (21). The elements are disturbed from their regular pattern to prevent the formation of moire patterning in the final image. The distances between nodes in the phosphor matrix is made randomly shorter or longer than in the input counterpart matrix by between 3% and 50% (average 14%) in both planar dimensions. The filter colour repetition pattern in the phosphor matrix can also be disturbed by deliberately disordering the grouping of phosphor colours.