公开(公告)号：US20240205363A1

公开(公告)日：2024-06-20

申请号：US18444524

申请日：2024-02-16

Applicant: Apple Inc.

Inventor： David R. POPE ,  Liran FISHEL ,  Assaf METUKI ,  Muge WANG

IPC: H04N5/76 ,  G06T1/60 ,  G06T7/246 ,  H04N1/21

CPC classification number: H04N5/76 ,  G06T1/60 ,  G06T7/251 ,  H04N1/2141 ,  G06T2207/20016

Abstract: Embodiments relate to extracting features from images, such as by identifying keypoints and generating keypoint descriptors of the keypoints. An apparatus includes a pyramid image generator circuit, a keypoint descriptor generator circuit, and a pyramid image buffer. The pyramid image generator circuit generates an image pyramid from an input image. The keypoint descriptor generator circuit processes the pyramid images for keypoint descriptor generation. The pyramid image buffer stores different portions of the pyramid images generated by the pyramid image generator circuit at different times and provides the stored portions of the pyramid images to the keypoint descriptor generator circuit for keypoint descriptor generation. When first portions of the pyramid images are no longer needed for the keypoint descriptor generation, the first portions are removed from the pyramid image buffer to provide space for second portions of the pyramid images that are needed for the keypoint descriptor generation.

公开(公告)号：US20250054274A1

公开(公告)日：2025-02-13

申请号：US18932195

申请日：2024-10-30

Applicant: Apple Inc.

Inventor： Assaf METUKI ,  Lukas POLOK ,  Danny GAL ,  Liran FISHEL

IPC: G06V10/75 ,  G06V10/74

Abstract: Embodiments of the present disclosure relate to selecting a subset of keypoint descriptors of two images for match operation based on their orientation angles indicated in headers of the keypoint descriptors. The keypoint descriptors in the two images are matched by first comparing their headers and then performing vector distance determination. During the header comparison operation, a header of a descriptor of a first image is compared only with headers of keypoint descriptors of a second image in a discrete orientation angle range corresponding to an orientation angle indicated by the header of the first image descriptor or keypoint descriptors of the second image in adjacent discrete orientation angle ranges. After the headers of the keypoint descriptors satisfying one or more matching criteria are determined, distance determination operations are performed between the keypoint descriptors while the remaining keypoint descriptors are discarded without determining their distances.