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Abstract

An imagery data memory addressing mechanism writes data representative of respective pixel values of an image into and reads out of immediately successive storage locations of memory, irrespective of whether the number of pixels in the image is the same as or less than the number of storage locations of memory, facilitating the use of a DMA controller and reducing access time. Data values associated with successive pixels of a first line of the m lines of the m.times.n image are stored in successive first through n storage locations of the framestore memory and data values associated with successive pixels of successive ones of second through m lines of the image are stored in successive (n+1) through mn storage locations of the framestore, so that there are no unused or dummy memory locations (in which `fill` data is inserted) between those memory addresses associated with the first line and the last or mth line of the image. Once the framestore has been loaded with pixel data of the image of interest, all or a selected portion of the image may be accessed and coupled to an output device the spatial resolution of which may differ from that of the stored image. Also, the coordinates of the pixels of the selected portion of the output image array need not necessarily coincide with spatial locations of the pixels of the stored image. To read data out of the framestore, pixel code values stored in respective pluralities of memory storage locations associated with respective neighborhoods of pixels surrounding respective ones of pseudo pixels of the output image are weighted and combined.

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