How to exclude or mask small regions of video from feature detection?

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Nelson 2022-11-10

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评论： Image Analyst 2022-11-15

I want to try doing SLAM on some video from a helicopter. Unfortunately the video has a data overlay that interferes with the detection of features. Unfortunately, some of the overlay is in the center of the image, so selecting a rectangular ROI would be limited to a very small part of the image.

How can I tell the feature detector to ignore some portions of the image? The overlay pixel locations are very consistent, so I want to use a mask.

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Image Analyst 2022-11-10

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Perhaps you can use the Color Thresholder to identify the blue-green pixels. Then use regionfill to fill them in with the surrounding "good" parts of the image.

See attached m-file.

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Nelson 2022-11-15

编辑：Nelson 2022-11-15

The cyan text certainly causes a lot of undesired detections, but the detector I tested seems to ignore pure-black (zeros). Maybe that's the convention for the detector, that black pixels are ignored. Thanks!