Image processing method, image-pickup apparatus and image processing apparatus using the method, and non-transitory computer-readable storage medium storing image processing program using the method

An image processing method comprising the steps of:

• acquiring an input image generated by image pickup through an optical system;
• generating step of generating a point spread function by using coefficient data of a function approximating a point spread function corresponding to an image-pickup condition of the optical system;
• and
• providing step of providing unsharp mask processing to the input image using a filter generated based on information of the point spread function generated by using the coefficient data,
• wherein the filter has two-dimensional data.

An image processing apparatus comprising:

• an acquirer configured to acquire an input image generated by image pickup through an optical system;
• a generator configured to generate a point spread function using coefficient data of a function approximating a point spread function corresponding to an image-pickup condition of the optical system;
• and
• a processor configured to provide unsharp mask processing to the input image using a filter generated based on information of the point spread function generated by using the coefficient data,
• wherein the filter has two-dimensional data.

An image-pickup apparatus comprising:

• an image sensor configured to pickup an image formed through an optical system;
• and
• an image processing apparatus,
• wherein the image processing apparatus includes:
• an acquirer configured to acquire the image input by the image sensor;
• a generator configured to generate a point spread function using coefficient data of a function approximating a point spread function corresponding to an image-pickup condition of the optical system;
• and
• a processor configured to provide unsharp mask processing to the input image using a filter generated based on information of the point spread function generated by using the coefficient data,
• wherein the filter is two-dimensional data.