Invention Grant
US08582889B2 Scale space normalization technique for improved feature detection in uniform and non-uniform illumination changes
有权
尺度空间归一化技术，用于改进均匀和不均匀照明变化中的特征检测
- Patent Title: Scale space normalization technique for improved feature detection in uniform and non-uniform illumination changes
- Patent Title (中): 尺度空间归一化技术，用于改进均匀和不均匀照明变化中的特征检测
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Application No.: US12986607Application Date: 2011-01-07
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Publication No.: US08582889B2Publication Date: 2013-11-12
- Inventor: Sundeep Vaddadi , John H. Hong , Onur C. Hamsici , Chong U. Lee
- Applicant: Sundeep Vaddadi , John H. Hong , Onur C. Hamsici , Chong U. Lee
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agent James R. Gambale, Jr.
- Main IPC: G06K9/00
- IPC: G06K9/00
Abstract:
A normalization process is implemented at a difference of scale space to completely or substantially reduce the effect that illumination changes has on feature/keypoint detection in an image. An image may be processed by progressively blurring the image using a smoothening function to generate a smoothened scale space for the image. A difference of scale space may be generated by taking the difference between two different smoothened versions of the image. A normalized difference of scale space image may be generated by dividing the difference of scale space image by a third smoothened version of the image, where the third smoothened version of the image that is as smooth or smoother than the smoothest of the two different smoothened versions of the image. The normalized difference of scale space image may then be used to detect one or more features/keypoints for the image.
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