Apparatus and method for inspecting a glass sheet

A method of inspecting an edge of a glass sheet, the method comprising:

• directing light onto an edge portion of the glass sheet with a light source, wherein the light is incident on the edge portion of the glass sheet in a direction oblique to a first side of the glass sheet;
• acquiring an image of the glass sheet from a camera disposed on a second side of the glass sheet opposite from the light source, wherein the camera senses the light incident on the glass sheet in the direction oblique to the first side of the glass sheet;
• detecting an edge line of the glass sheet from the image, the edge line corresponding to an actual edge of the glass sheet;
• determining a reference line based on the edge line;
• and
• detecting an edge defect of the glass sheet by comparing the edge line and the reference line, wherein detecting an edge defect of the glass sheet comprises detecting at least one of a type of the edge defect, a size of the edge defect, and a position of the edge defect, wherein:
• directing light onto the edge portion of the glass sheet comprises reflecting and directing the light onto the glass sheet in the direction oblique to the first side of the glass sheet;
• and
• acquiring the image of the glass sheet from the camera comprises adjusting an orientation of a plane of focus of the camera such that the plane of focus of the camera is parallel to the glass sheet and orienting the light incident on the glass sheet in the direction oblique to the first side of the glass sheet such that the light is reflected towards the camera.