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Abstract

An image processing system for effecting a predetermined transformation to data representing a multiplicity of pixels which together form an initial image so as to create data representing a multiplicity of pixels which together form a transformed image in which each pixel is formed as a weighted combination of pixels in a respective block of data in the initial image. The system includes a controller operable for each pixel in the transformed image to identify the block of data containing all pixels in the initial image that contribute to the transformed image pixel, to divide the block into a plurality of sub-blocks comprising a plurality of rows of pixel data and plurality of columns of pixel data, and to calculate for each sub-block a set of transformation coefficients depending on the predetermined transformation. A transforming unit applies the respective transformation coefficients to each sub-block of data in order to produce an intermediate value for each sub-block, and an accumulator accumulates the intermediate values from the transforming unit such that once the transforming unit has applied the transformation coefficients to every sub-block in the initial image data block the accumulated value in the accumulator comprises the data defining the transformed image pixel. The controller is arranged for each sub-block to control the transforming unit to apply respective transformation coefficients to each row of pixel data in the sub-block one row at a time in order to produce data representing for each row a partial result and, once transformation coefficients have been applied to every row in the sub-block, to produce data representing a set of partial results, and to apply transformation coefficients to the set of partial results in order to produce the intermediate result.

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