Method for detecting sky in images
AssigneeEastman Kodak Company
InventorsJiebo Luo, Stephen Etz
Life of this patent
Estimating the term…
Abstract
A method, image recognition system, computer program, etc., for detecting sky regions in an image comprise classifying potential sky pixels in the image by color, extracting connected components of the potential sky pixels, eliminating ones of the connected components that have a texture above a predetermined texture threshold, computing desaturation gradients of the connected components, and comparing the desaturation gradients of the connected components with a predetermined desaturation gradient for sky to identify true sky regions in the image.
Claims30
A method of detecting sky regions in an image comprising:
- classifying potential sky pixels in said image by color;
- extracting connected components of said potential sky pixels;
- eliminating ones of said connected components that have a texture above a predetermined texture threshold;
- computing desaturation gradients of said connected components;
- and
- comparing said desaturation gradients of said connected components with a predetermined desaturation gradient for sky to identify true sky regions in said image.
A method of detecting sky regions in an image comprising:
- computing desaturation gradients of regions in said image;
- and
- comparing said desaturation gradients of said regions with a predetermined desaturation gradient for sky to identify true sky regions in said image.
An image identification system comprising:
- a color classifier classifying potential sky pixels in said image by color;
- an extractor identifying connected components of said potential sky pixels;
- a first comparator eliminating ones of said connected components that have a texture above a predetermined texture threshold;
- a logic unit computing desaturation gradients of said connected components;
- and
- a second comparator comparing said desaturation gradients of said connected components with a predetermined desaturation gradient for sky to identify true sky regions in said image.
A method of using and a computer program running on a computer system to detect sky regions in an image, said method comprising:
- using said computer program to classify potential sky pixels in said image by color;
- using said computer program to extract connected components of said potential sky pixels;
- using said computer program to eliminate ones of said connect components that have a texture above a predetermined texture threshold;
- using said computer program to computer desaturation gradients of said connected components;
- and
- using said computer program to compare said desaturation gradients of said connected components with a predetermined desaturation gradient for sky to identify true sky regions in said image.
Dependencies are inferred from the claim text.