[in Japanese]

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[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

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[in Japanese]

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The lower and the upper thresholds of motion perception were measure along the horizontal and the vertical meridians of the retina in photopic illuminance.
The lower threshold was minimum at fovea and increased systematically with increase in the peripheral angle along either meridian. And, it was found that the minimum discriminable extent of movement, the displacement threshold, is no smaller in foveal vision and smaller in peripheral vision than acuity threshold.
The upper threshold was determined by measuring the fusion length of a target moving sinusoidally to and fro. And, it was found that the upper threshold of motion perception increases systematically with increase in the peripheral angle along either meridian.
From these results it was confirmed that foveal vision is superior in perceiving slow and small movement and peripheral vision is superior in perceiving fast movement.

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With the aim of automatic inspection of manufactured products at the factory, a system of pattern inspection and defect detection incorporating a Laser system with a vidicon camera and a microprocessor is proposed and tested.
In the system, which is a hybrid two-dimensional image processor, the input image of the object being tested is Fourier-transformed by the Laser Optics and then compared with the pre-stored reference pattern by microprocessor.
While the corrections for the positional shift and rotation of the object are generally required to accomplish an effective comparison, this system is shift-invariant and rotation-free by nature and it takes only less than a second to detect the defects.
This paper reports the construction of the system, the principle of shift and rotation compensation and some experimental results.

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