Hideyo Nagashima

The phase spectrum-based measurement of the TEM parameters

Abstract The phase spectrum-based method proposed by Koster et al. (Ultramicroscopy 27 (1989) 251) has experimentally been demonstrated by a computerized 200 kV transmission electron microscope with a slow-scan CCD camera system, which has theoretical advantages compared to other methods utilizing diffractograms. Crucial for the practical implementation of the method has been the addition of a linear phase term in the mathematical model made of the phase contrast transfer function to represent image drift. Moreover, to improve the accuracy of the method for measuring the TEM parameters (defocus, astigmatism and beam tilt misalignment), the model for least squares fitting was used in its full mathematical form without approximation by the DSB imaging model, neglecting the SSB imaging as was done in the original proposal. Experimental results of the TEM parameter measurements, defocus, astigmatism and beam tilt misalignment, by the phase spectrum-based method are demonstrated.

Subjective Similarity of Trademarks Evaluated by Human Kansei

In this paper we are concerned with human subjective similarity between trademarks. We have been studying retrieval of similar trademarks in which human visual mentality is reflected. In our studies data on human subjective evaluation of similarity based upon kansei are obtained by questionnaire and the obtained human evaluation data are used for retrieval of similar trademarks. For questionnaires on similarity between figures paper is usually used but here computerized questionnaires are proposed and comparisons are made between the results obtained by computer-administrated questionnaires and those administrated in written form. We also defined “certainty of subjective similarity” using entropy, which represents the certainty of kansei information on similarity of figures and a comparison between questionnaires by different media is made by using it.

A random pattern method for gray pictures in a high-speed processing time.

第2種スターリング数を用いたランダムパターン法の, 入・出力強度特性に線形変換特性を持たせ, 従来のランダムパターン法と比較して約36%程度の処理時間で中間調画像表示を行うごとが可能となった.