Workpiece quality determination method and workpiece quality determination system

A workpiece quality determination system for determining a quality of a workpiece based on a stripe pattern projected on a surface of the workpiece, the system comprising a processor that executes programs stored in memory, the processor being configured to perform the following processing of:

• setting an observation angle at which the stripe pattern projected on the workpiece is observed;
• setting a stripe projection angle of the projected stripe pattern at the set observation angle;
• creating a reference stripe pattern from the projected stripe pattern by performing smoothing for the projected stripe pattern at the set stripe projection angle;
• and
• calculating a difference between the projected stripe pattern and the reference stripe pattern at the stripe projection angle to determine the quality based on the difference,
• wherein the workpiece quality determination system further comprises a camera that photographs the projected stripe pattern and a stripe projection device that that projects a stripe pattern on a surface of the workpiece.

A workpiece quality determination method for determining a quality of a workpiece based on a stripe pattern projected on a surface of the workpiece, comprising:

• observation angle setting of setting an angle at which the stripe pattern projected on the workpiece is observed;
• stripe projection angle setting of setting a stripe projection angle of the projected stripe pattern at the set observation angle;
• reference stripe pattern creation of creating a reference stripe pattern from the projected stripe pattern at the set stripe projection angle;
• and
• quality determination of calculating a difference between the projected stripe pattern and the reference stripe pattern at the stripe projection angle to determine the quality based on the difference,
• wherein the stripe projection angle with respect to a curve long-side direction of the workpiece is taken as a reference projection angle, and
• in the quality determination, the quality is determined by changing the stripe projection angle to a plurality of angles from the reference projection angle.

A workpiece quality determination system for determining a quality of a workpiece based on a stripe pattern projected on a surface of the workpiece, the system comprising a processor that executes programs stored in memory, the processor being configured to perform the following processing of:

• setting an observation angle at which the stripe pattern projected on the workpiece is observed;
• setting a stripe projection angle of the projected stripe pattern at the set observation angle;
• creating a reference stripe pattern from the projected stripe pattern at the set stripe projection angle;
• and
• calculating a difference between the projected stripe pattern and the reference stripe pattern at the stripe projection angle to determine the quality based on the difference,
• wherein the workpiece quality determination system further comprises a camera that photographs the projected stripe pattern and a stripe projection device that that projects a stripe pattern on a surface of the workpiece,
• wherein a stripe projection angle with respect to a curve long-side direction of the workpiece is taken as a reference projection angle, and
• the quality determinator determines the quality by changing the stripe projection angle to a plurality of angles from the reference projection angle.