Inspection method, non-transitory recording medium recording computer program, and projection system

An inspection method of geometric correction in a projection system that causes a projector to project an image on a projection surface, the inspection method being executed by an arithmetic device accessing to a storage, the method comprising:

• storing, in the storage,
• space information of a real space in which the projector, the projection surface, and an imaging device capable of capturing the projection surface are disposed,
• parameter information set to the projector and the imaging device, and
• a pattern image including a plurality of feature points indicating coordinates on an image to be projected on the projection surface by the projector;
• and
• by the arithmetic device,
• generating virtual space information including a state in which a virtual projector and a virtual imaging device to which virtual parameter values based on the parameter information are set are disposed in a virtual space virtually constructed based on the space information,
• causing the virtual projector to project the pattern image onto a virtual projection surface in the virtual space information,
• acquiring virtual first captured image data including the pattern image projected onto the virtual projection surface, the virtual first captured image data being captured by the virtual imaging device,
• comparing a feature point included in the virtual first captured image data with each of the plurality of feature points included in the pattern image, to extract a plurality of non-projected feature points that are not to be projected onto the virtual projection surface, and
• generating non-projected feature point data in which the plurality of non-projected feature points extracted are arranged at corresponding positions in a range of a virtual projection image to be projected by the virtual projector.

A projection system comprising:

• an arithmetic device accessing to a storage;
• a projector controlled by the arithmetic device to project an image onto a projection surface;
• and
• an imaging device capturing an image including the projection surface,
• wherein the storage stores a pattern image including a plurality of feature points indicating coordinates on an image to be projected by the projector onto the projection surface;
• and
• upon inspection of the projection system, the arithmetic device causes the projector to project the pattern image onto the projection surface, acquires from the imaging device first captured image data including the pattern image projected on the projection surface,
• compares a feature point included in the first captured image data with each of the plurality of feature points included in the pattern image, to extract a plurality of non-projected feature points that are not to be projected on the projection surface, and
• generates non-projected feature point data in which the plurality of non-projected feature points extracted are arranged at corresponding positions in a range of a projection image to be projected by the projector.