Method for displaying an image of a portion of the inside of a three-dimensional physical structure
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United States of America Patent
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May 2, 1995
Grant Date -
N/A
app pub date -
May 24, 1991
filing date -
May 25, 1990
priority date (Note) -
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Abstract
In order to display a portion of a physical structure on a screen, an intermediate 'pointer' memory is created. The addresses of memory words in the pointer memory correspond to the coordinates of pixels on a display screen, or in equivalent manner to the corresponding addresses of memory words in an image memory. The information loaded into the memory words of the pointer memory is representative of addresses in an 'original' memory whose collection of memory words represents the structure under investigation. It is shown that by using the pointer memory it is possible for each voxel of the structure to establish quickly the coordinates of the position at which it ought to appear on the screen, and thus the address of the corresponding memory words in the pointer memory, by using previously-calculated memory addresses for the pointer memory. It is shown that by using such previously-calculated memory addresses, the need to perform multiplications is avoided, as is the need to perform repeated accesses to the original memory. Very high speed processing is obtained in this way.
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