Magnetic domain structure analyzing device, magnetic domain structure analyzing method, program, method of manufacturing grain-oriented electromagnetic steel sheet, grain-oriented electromagnetic steel sheet, and iron core

A magnetic domain structure analyzing method comprising:

• a magnetic domain image acquiring step of acquiring a magnetic domain image by imaging a grain-oriented electromagnetic steel sheet;
• and
• a magnetic domain width measuring step of measuring a width of a magnetic domain on the basis of the magnetic domain image,
• wherein the magnetic domain width measuring step
• generates a plurality of filter kernels of different spatial sizes by multiplying a complex one-dimensional Gabor filter by A in a spatial direction corresponding to a direction orthogonal to a rolling direction of the grain-oriented electromagnetic steel sheet, and by 1/A in an amplitude direction,
• applies the plurality of filter kernels respectively to the magnetic domain image, and calculates an absolute value of filter output per filter kernel, and
• derives the width of the magnetic domain of the grain-oriented electromagnetic steel sheet on the basis of the spatial size of the filter kernel whose absolute value is largest among the plurality of filter kernels.

A non-transitory computer-readable storage medium storing a program for causing a computer to execute processings, the processings comprising:

• a magnetic domain image acquiring step of acquiring a magnetic domain image by imaging a grain-oriented electromagnetic steel sheet;
• and
• a magnetic domain width measuring step of measuring a width of a magnetic domain on the basis of the magnetic domain image,
• wherein the magnetic domain width measuring step
• generates a plurality of filter kernels of different spatial sizes by multiplying a complex one-dimensional Gabor filter by A in a spatial direction corresponding to a direction orthogonal to a rolling direction of the grain-oriented electromagnetic steel sheet, and by 1/A in an amplitude direction,
• applies the plurality of filter kernels respectively to the magnetic domain image, and calculates an absolute value of filter output per filter kernel, and
• derives the width of the magnetic domain of the grain-oriented electromagnetic steel sheet on the basis of the spatial size of the filter kernel whose absolute value is largest among the plurality of filter kernels.