ディジタル画像データを用いた変調伝達関数 (MTF) の計測

概要

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The image that has been scanned to produce an analog signal which is then converted into digital form and stored in the frame memory, by means of a small scale image processing system. This time, the physical charactristics in these digitized images were extracted from the image analysis. The image processing system is comparatively low in price and very avaliable, and is able to be applied image analysis, various processing of digitized images. Sensitometric strips and slit images were made in the same way as the conventional method. These samples were scanned using a CCD camera; not using a microdensitometer. The modulation transfer factors (MTF's) of screen/film system was calculated by the Fourier transform method, by means of the digitized image data. There were hardly any difference between MTF that had been measured for the conventional system by means of microdensitometer and that which had been measured for our digital image processing system. This measurement method have several merits when compaed with the conventional method; The measurement time required was greatly shorten, and various influences were excluded which are nopmoely caused by a microdensitometer.
社団法人日本放射線技術学会の論文
1990-01-01