The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 26, 1995
Filed:
Jun. 27, 1994
Fumio Komatsu, Fuchu, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A method of extracting a feature of an image, includes: a first step of performing a logarithmic conversion process for each pixel of an image taken by an electron microscope to carry out non-linear image enhancement; a second step of performing an N(N is a predetermined value) valued process for each pixel of the image underwent the logarithmic conversion process, threshold values for the N valued process being obtained by dividing the whole range of gray levels of the pixels by N, and gray level of the pixel being one of N constant gray level values by the N valued process; a third step of performing a partial differentiatial process in X- and Y-directions for each pixel of the image obtained by the second step, to make '0' the gray levels of pixels within the same area divided by the N valued process and make only the boundary between different areas divided by the N valued process to have a certain gray level; and a fourth step of detecting the boundary and extracting a feature of said image.