Methods and systems of local signal equalization

Number: 9779487
Published: 2017-10-03
Filed: 2014-05-15
Assignee: Disney Enterprises, Inc.
Inventors: Bradley; Derek et al.
CPC: G06T5/10; G06T5/73; G06T7/32
Verdict: Set aside local signal equalization - generic image processing
Source: Google Patents · FreePatentsOnline

Abstract

Methods and systems of equalizing spatial frequency signals for images are provided. Images distorted through defocus, motion blur, under-sampling or other reasons may be equalized. Equalized spatial frequency signals may be used to determine correspondence matching between images. Image patches from two or more image signals may be identified and analyzed to determine image patches that contain similar representations of the real scene, with sufficient local details for accurately computing cross-correlation.

Background

BRIEF DESCRIPTION OF DRAWINGS(1) The present disclosure, in accordance with one or more various embodiments, is described in detail with reference to the following figures. The figures are provided for purposes of illustration only and merely depict typical or example embodiments of the disclosure.(2) FIG. 1 is a flow diagramillustrating an example method of local signal equalization in accordance with an embodiment of the present application.(3) FIG. 2 illustrates a series of frequency plots illustrating inter-signal equalization of image signals in accordance with an embodiment of the present application.(4) FIG. 3 is a flow diagram illustrating an example method of determining a reference frequency for equalizing image signals, such as step 104 illustrated in FIG. 1.(5) FIG. 4 illustrates an exemplary image pyramid of an image patch in accordance withan embodiment of the present application.(6) FIG. 5 illustrates equalizing image patches centered around pixels in accordance with an embodiment of the present application.(7) FIG. 6 illustrates exemplary frequency content for image patches of an image in accordance with an embodiment of the present application.(8) FIG. 7 illustrates local frequency maps for images in accordance with an embodiment of the present application.(9) FIG. 8 illustrates the level of the scale-space at which the marching occurs for each pixel of images in accordance with an embodiment of the present application.(10) FIG. 9 illustrates an example com

Claims

1. A computer-implemented method, comprising: identifying a first image patch and a second image patch, the first image patch corresponding to a first set of spatial frequency signals, and the second image patch corresponding to a second set of spatial frequency signals; determining a reference frequency ({tilde over (ω)}) based on the first set of spatial frequency signals and the second set of spatial frequency signals; equalizing the first image patch and the second image patch based on the reference frequency by scaling the first image patch and the second image patch by π/{tilde over (ω)} to spread the frequencies over a domain; and determining correspondence matching between the equalized first image patch and the equalized second image patch. 8. A system, comprising: a processor; and non-transitory memory storing a set of instructions, the set of instructions configured to cause the processor to: identify a first image patch and a second image patch, the first image patch corresponding to a first set of spatial frequency signals, and the second image patch corresponding to a second set of spatial frequency signals; determine a reference frequency ({tilde over (ω)}) based on the first set of spatial frequency signals and the second set of spatial frequency signals; equalize the first image patch and the second image patch based on the reference frequency by scaling the first image patch and the second image patch by π/{tilde over (ω)} to spread the frequencies over a domain; and determine correspondence matching between the first image patch and the second image patch using the equalized spatial frequency signals.