Adaptive interest rate control for visual search
First Claim
Patent Images
1. An image processing system, comprising:
- one or more memories configured to store image data; and
image processing circuitry, which, in operation;
identifies one or more interest points in a first sub-region of image data associated with an image frame based upon an interest point threshold value;
determines the interest point threshold value based at least in part upon a number of interest points identified in a previous sub-region of image data for the image frame; and
processes image data associated with the image frame based on the identified interest points, wherein the image processing circuitry is configured to;
determine the interest point threshold value based in part upon a recognition rate;
generate descriptor data for at least one identified interest point; and
evaluate matches between features of two or more images based at least in part on the descriptor data, wherein the image processing circuitry is configured to determine the interest point threshold value based in part upon a target number of interest points calculated for the previous sub-region.
3 Assignments
0 Petitions
Accused Products
Abstract
Image-processing apparatus and methods to adaptively vary an interest point threshold value and control a number of interest points identified in an image frame are described. Sub-regions of an image frame may be processed in a sequence, and an interest point threshold value calculated for each sub-region. The calculated value of the interest point threshold may depend upon pre-selected values and values determined from the processing of one or more prior sub-regions. By using adaptive thresholding, a number of interest points detected for each frame in a sequence of image frames may remain substantially constant, even though objects within the frames may vary appreciably.
75 Citations
16 Claims
-
1. An image processing system, comprising:
-
one or more memories configured to store image data; and image processing circuitry, which, in operation; identifies one or more interest points in a first sub-region of image data associated with an image frame based upon an interest point threshold value; determines the interest point threshold value based at least in part upon a number of interest points identified in a previous sub-region of image data for the image frame; and processes image data associated with the image frame based on the identified interest points, wherein the image processing circuitry is configured to; determine the interest point threshold value based in part upon a recognition rate; generate descriptor data for at least one identified interest point; and evaluate matches between features of two or more images based at least in part on the descriptor data, wherein the image processing circuitry is configured to determine the interest point threshold value based in part upon a target number of interest points calculated for the previous sub-region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method, comprising:
-
identifying, using image processing circuitry, one or more interest points in a first sub-region of image data associated with an image frame based upon an interest point threshold value; determining, using the image processing circuitry, the interest point threshold value based at least in part upon a number of interest points identified in a previous sub-region of image data for the image frame, wherein the interest point threshold value is based in part upon a recognition rate; processing, using the image processing circuitry, image data associated with the image frame based on the identified interest points; generating, using the image processing circuitry, descriptor data for at least one identified interest point; and evaluating, using the image processing circuitry, a quality of matching between features of two or more images based at least in part on the descriptor data, wherein the interest point threshold value is based in part upon a target number of interest points calculated for the previous sub-region. - View Dependent Claims (12, 13)
-
-
14. A non-transitory, computer-readable medium having contents which cause one or more image processing devices to perform a method, the method comprising:
-
identifying, one or more interest points in a first sub-region of image data associated with an image frame based upon an interest point threshold value; determining the interest point threshold value based at least in part upon a number of interest points identified in a previous sub-region of image data for the image frame, wherein the interest point threshold value is based in part upon a recognition rate; and processing image data associated with the image frame based on the identified interest points, wherein the method comprises; generating descriptor data for at least one identified interest point; and evaluating a quality of matching between features of two or more images based at least in part on the descriptor data, wherein the interest point threshold value is based in part upon a target number of interest points calculated for the previous sub-region. - View Dependent Claims (15, 16)
-
Specification