| 摘要 |
PURPOSE:To easily obtain geometric dimensions of a magnetic head with high accuracy, by image-picking up a gap of the magnetic head in the same picture, and extracting position co-ordinates by processing a picture. CONSTITUTION:A gap part of a magnetic head is magnified by a microscope, a magnified image is image-picked up in the same picture by an ITV camera, etc. of 512 horizontal scanning lines, becomes a video signal at every horizontal scanning, is divided into 512 picture elements by an A/D converting part 1, and is converted to a digital data by quantizing the degree of light and darkness. The converted video signal is written in a 4H memory part 2. A differential calculation is executed in an operating part I 3, digital conversion and a differential calculation in the (x) and (y) directions are executed in an operating part II6, an evaluating calculation is executed in an operating part III11, frequency is calculated in an operating part IV13, and position co- ordinates are subjected to arithmetical mean and are made position co-ordinates. The number calculation for satisfying the condition is executed in an operating part V15, picture processing by the evaluating calculation is executed in an operating part VI18, position co-ordinates are decided by te same calculation as the operating part IV13, in an operating part VII20, and geometric dimensions are calculated in accordance with true extracted position co-ordinates, in an operating part VIII21. |
