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

Claim 0:
1. An apparatus, comprising:
a pyramid image generator circuit configured to generate an image pyramid from an input image, the image pyramid including pyramid images at different octaves and scales;
a response map (RM) generator circuit configured to generate RM images based on the pyramid images, the RM images comprising a first subset of RM images of a first octave of the different octaves and a second subset of RM images of a second octave of the different octaves;
an intra octave keypoint candidate selector circuit configured to determine keypoint candidates of keypoints of the input image based on a comparison between at least two RM images in the first subset of RM images of the first octave;
an inter octave keypoint selector circuit configured to determine keypoints from the keypoint candidates based on a comparison between the first subset of RM images and the second subset of RM images;
a keypoint descriptor generator circuit configured to process the pyramid images and the keypoints for keypoint descriptor generation of the keypoints;
a pyramid image buffer circuit configured to store different portions of the pyramid images at different times, for sending to the keypoint descriptor generator circuit for the keypoint descriptor generation, and
an RM buffer circuit configured to store different portions of the RM images generated at different times, for sending to the inter octave keypoint selector circuit for keypoint candidate determination.