Estimation device, estimation method, and storage medium

An estimation method comprising:

• generating a perturbation extraction region by adding a perturbation to an extraction region in a face image, the perturbation includes a parallel translation of the extraction region, the extraction region being determined based on positions of feature points extracted from the face image, a magnitude of the perturbation being based on an image quality of the face image;
• estimating, based on a plurality of partial images including a first partial image and a second partial image, a plurality of directions and a reliability of each of the plurality of directions, the plurality of directions being a plurality of face directions or the plurality of directions of lines of sight, the first partial image being extracted from the extraction region in the face image, the second partial image being extracted from the perturbation extraction region in the face image;
• and
• calculating an integrated direction obtained by integrating the plurality of directions based on the estimated reliability,
• wherein the second partial image is generated by adding a second perturbation to an extracted partial image extracted from the perturbation extraction region in the face image, the second perturbation including enlargement of the extracted partial image.

A non-transitory computer readable storage medium storing a program causing a computer to execute processing of:

• generating a perturbation extraction region by adding a perturbation to an extraction region in a face image, the perturbation includes a parallel translation of the extraction region, the extraction region being determined based on positions of feature points extracted from the face image, a magnitude of the perturbation being based on an image quality of the face image;
• estimating, based on a plurality of partial images including a first partial image and a second partial image, a plurality of directions and a reliability of each of the plurality of directions, the plurality of directions being a plurality of face directions or the plurality of directions of lines of sight, the first partial image being extracted from the extraction region in the face image, the second partial image being extracted from the perturbation extraction region in the face image;
• and
• calculating an integrated direction obtained by integrating the plurality of directions based on the estimated reliability,
• wherein the second partial image is generated by adding a second perturbation to an extracted partial image extracted from the perturbation extraction region in the face image, the second perturbation including enlargement of the extracted partial image.