Edge detection
AssigneeAnalogic Corporation
InventorsYesna Oyku Yildiz, Douglas Q. Abraham
Life of this patent
Estimating the term…
Abstract
One or more techniques and/or systems for detecting edges in images of objects subjected to imaging using imaging apparatus are disclosed, such that the effect of image noise on the edge detection can be mitigated. Ratios of intensity values (e.g., signal values) for a subject region (e.g., a pixel) and respective adjacent regions are determined. An adaptive threshold value is determined for respective adjacent region pairs. The ratio value is compared to the adaptive threshold value for respective adjacent region pairs, to determine whether an edge is present between the respective adjacent region pairs.
Claims22
A method for detecting edges in an image produced by imaging of one or more objects, comprising:
- determining region ratio values of a first region and respective adjacent regions comprising:
- if the intensity value of the first region is greater than the intensity value of an adjacent region divide the intensity value of the adjacent region into the intensity value of the first region;
- if the intensity value of the adjacent region is greater than the intensity value of the first region divide the intensity value of the first region into the intensity value of the adjacent region;
- and
- if the intensity value of the first region is equal to the intensity value of an adjacent region set region ratio value equal to one;
- determining an adaptive threshold value for respective adjacent regions;
- and
- determining whether an edge is present between the first region and respective adjacent regions comprising comparing the region ratio value for the first region and the adjacent region to the adaptive threshold value for the respective regions.
A system for detecting edges in an image produced by subjecting one or more objects to imaging, comprising:
- an image intensity ratio determiner configured to determine one or more image intensity value ratios between adjacent regions in the image;
- an adaptive threshold generator configured to generate an adaptive threshold value for respective adjacent regions in the image corresponding to the one or more image intensity value ratios;
- and
- an edge determiner configured to identify an edge between regions in the image by comparing an image intensity value ratio for adjacent regions in the image with a corresponding adaptive threshold value.
18-23. (canceled)
26-29. (canceled)
A method for detecting edges in an image produced by imaging of one or more objects, comprising:
- determining pixel ratio values of a first pixel and respective adjacent pixels comprising:
- if the intensity value of the first pixel is greater than the intensity value of an adjacent pixel divide the intensity value of the adjacent pixel into the intensity value of the first pixel;
- if the intensity value of the adjacent pixel is greater than the intensity value of the first pixel divide the intensity value of the first pixel into the intensity value of the adjacent pixel;
- and
- if the intensity value of the first pixel is equal to the intensity value of an adjacent pixel set pixel ratio value equal to one;
- determining an adaptive threshold value for respective adjacent pixels;
- and
- determining whether an edge is present between the first pixel and respective adjacent pixels comprising comparing the pixel ratio value for the first pixel and the adjacent pixel to the adaptive threshold value for the respective pixels.
Dependencies are inferred from the claim text.