Distortion inspection apparatus of a glass plate
AssigneeNippon Sheet Glass Co., Ltd.
InventorsKatsuhiko Kitaya, Nagayoshi Ichise
Life of this patent
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Abstract
In a distortion inspection apparatus of a glass plate, a light and dark contrast pattern is sensed by an image sensor through a glass plate. The number of bits corresponding to a light or dark portion is detected from bipolar image data which are divided into a plurality of bits along each of parallel scanning lines assumed upon a surface of the glass plate. Then, a distortion state of the surface of the glass plate is discriminated in accordance with the differences among the thus detected number of bits and a reference value thereof. In such an arrangement, quantitative distortion discrimination can be performed.
Claims15
A distortion inspection apparatus of a glass plate comprising:
- a light and dark stripe pattern in which bright and dark portions of the pattern are alternately arranged;
- image sensing means for sensing images of the pattern viewed through said glass plate so as to obtain image data corresponding to said light and dark stripe pattern for each of a plurality of parallel scanning lines assumed upon a surface of the glass plate said image data consisting of a plurality of bit images;
- detecting means for detecting the number of bits of said image data representing widths of the bright or dark portion along each scanning line;
- and discriminating means for discriminating a distortion state of the glass plate with reference to a difference between the number of bits detected by said detecting means and a reference value corresponding to a predetermined number of bits.
Dependencies are inferred from the claim text.