US 12,131,564 B2
Sampling for feature detection in image analysis
Timothy Smith, London (GB)
Assigned to Imagination Technologies Limited, Kings Langley (GB)
Filed by Imagination Technologies Limited, Kings Langley (GB)
Filed on May 23, 2022, as Appl. No. 17/751,518.
Application 17/751,518 is a continuation of application No. 16/375,943, filed on Apr. 5, 2019, granted, now 11,373,394.
Claims priority of application No. 1805695 (GB), filed on Apr. 5, 2018.
Prior Publication US 2022/0284694 A1, Sep. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G06V 10/46 (2022.01); G06F 18/22 (2023.01); G06V 10/426 (2022.01); G06V 10/44 (2022.01); G06V 10/52 (2022.01); G06V 30/24 (2022.01); H04N 19/117 (2014.01); H04N 19/132 (2014.01)
CPC G06V 30/2504 (2022.01) [G06F 18/22 (2023.01); G06V 10/426 (2022.01); G06V 10/443 (2022.01); G06V 10/46 (2022.01); G06V 10/462 (2022.01); G06V 10/52 (2022.01); H04N 19/117 (2014.11); H04N 19/132 (2014.11); G06T 2207/20016 (2013.01); G06V 10/467 (2022.01)] 20 Claims
OG exemplary drawing
 
1. A descriptor generation system for generating a feature descriptor for a location in an image for use in performing descriptor matching in analysing the image, the descriptor generation system being configured to:
obtain scale-space data representative of the image, said scale-space data comprising a pre-filtered representation of the image at a plurality of length scales;
the descriptor generation system having a feature descriptor generator executed on a processor configured to:
determine a set of samples characterising a location in an image by sampling the scale-space data representative of the image in accordance with a descriptor pattern of the feature descriptor, wherein the descriptor pattern is used to determine length scales at which the samples are to be sampled from the pre-filtered representation of the image; and
generate the feature descriptor in dependence on the determined set of samples.