Patent ID: 11968471
Assignee: APPLE INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 13:
14. A method, comprising:
generating, by a pyramid image generator circuit, an image pyramid from an input image, the image pyramid including pyramid images at different octaves and scales;
generating, by a response map generator circuit, response map images based on the pyramid images, the response map images comprising a first subset of response map images of a first octave of the different octaves and a second subset of response map images of a second octave of the different octaves;
determining, by an intra octave keypoint candidate selector circuit, keypoint candidates of keypoints of the input image based on a comparison between at least two response map images in the first subset of response map images of the first octave;
determining, by an inter octave keypoint selector circuit, keypoints from the keypoint candidates based on a comparison between the first subset of response map images and the second subset of response map images;
processing, by a keypoint descriptor generator circuit, the pyramid images and the keypoints for keypoint descriptor generation of the keypoints;
storing, by a pyramid image buffer circuit, different portions of the pyramid images at different times, for sending to the keypoint descriptor generator circuit for the keypoint descriptor generation; and
storing, by a response map buffer circuit, different portions of the response map images generated at different times, for sending to the inter octave keypoint selector circuit for keypoint candidate determination.