IMAGE STABILIZATION TECHNIQUES FOR VIDEO SURVEILLANCE SYSTEMS
First Claim
1. A method for stabilizing camera images captured by a video recording device, the method comprising:
- identifying candidate regions within a reference frame to use in aligning a frame captured by a video camera, wherein the candidate regions are sorted in descending order by a density of tracked features within each candidate region;
designating a candidate region having a highest density of tracked features among the candidate regions as an alignment region for each captured frame; and
upon determining that the stream is unstable based on the tracked features in a current frame being misaligned relative to the corresponding features of the reference frame, aligning the current frame.
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Abstract
A behavioral recognition system may include both a computer vision engine and a machine learning engine configured to observe and learn patterns of behavior in video data. Certain embodiments may provide image stabilization of a video stream obtained from a camera. An image stabilization module in the behavioral recognition system obtains a reference image from the video stream. The image stabilization module identifies alignment regions within the reference image based on the regions of the image that are dense with features. Upon determining that the tracked features of a current image is out of alignment with the reference image, the image stabilization module uses the most feature dense alignment region to estimate an affine transformation matrix to apply to the entire current image to warp the image into proper alignment.
3 Citations
1 Claim
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1. A method for stabilizing camera images captured by a video recording device, the method comprising:
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identifying candidate regions within a reference frame to use in aligning a frame captured by a video camera, wherein the candidate regions are sorted in descending order by a density of tracked features within each candidate region; designating a candidate region having a highest density of tracked features among the candidate regions as an alignment region for each captured frame; and upon determining that the stream is unstable based on the tracked features in a current frame being misaligned relative to the corresponding features of the reference frame, aligning the current frame.
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Specification