抄録
This paper describes techniques for RI image processing with a microprocessor. The data measured by an imaging system are either written on a paper tape or on a cassette magnetic tape. The data are blurred by the low resolution of a detector or by a lot of noises. The improvement of the image quality is achieved with the filter based on the fast Hadamard transform (FHT). The hardware consists of a microprocessor, random access memory unit (RAM), cassette magnetic tape unit (CMT), paper tape reader (PTR), paper tape punch (PTP), CRT display and a graphic display which is external. The I/O devices are connected to the microprocessor via their own interfaces. The data are fed into the RAM through the PTR or the CMT, and are processed by the microprocessor under the control of a series of image processing programs in the form of a subroutine. These consist of algorithms of the filter based on the FHT, those of a 9 points smoothing, etc. The processed data are punched on paper tape with the PTP. For accurate diagnostic use, they are represented three-dimensionally on the graphic display, using punched tapes as a media.
Because the FHT deals with only real numbers and is performed by the additions and subtractions of fixed point data; the filter based on the FHT is advantageous both in computation time and in memory capacity.
Finally, application of this method to a clinical case is provided.
