METHOD AND APPARATUS FOR INSPECTING APPEARANCE OF OBJECT

摘要

A method and apparatus for inspecting an object is provided. By way of example, first and second images of the object obtained by using a camera and a lighting unit. The lighting unit and the camera is controlled so as to provide the first image picked up by the camera with a first quantity of light radiated from the lighting unit and the second image picked up by the camera with the second quantity of light radiated from the lighting unit. The first quantity of light is different from the second quantity of light. Differences between pixel values of the first image and pixel values of the second image are calculated. Then, it is determined whether the object has a non-defective appearance or a detective appearance, based on comparison between the differences and reference pixel values corresponding to the differences.

主权项

1. An apparatus for inspecting an appearance of an object, comprising:
a lighting unit radiating light to an object, the lighting unit being of selectively adjusting an quality of the light to a first light quantity and a second light quantity different from the first light quantity; a camera optically imaging the object; a unit obtaining first and second images of the object using the camera, the obtaining unit controlling the lighting unit and the camera so as to provide the first image picked up by the camera with the first light quantity and the second image picked up by the camera with the second light quantity; a unit calculating differences between pixel values of the first image and pixel values of the second image; and a unit determining whether the object has a non-defective appearance or a detective appearance based on comparison between the differences and reference pixel values corresponding to the differences.