System and method for improving an image characteristic of image frames in a video stream
AssigneeStereoVision Imaging, Inc.
InventorsRandall J. St. Romain, II, Ambrose J. Slone, Péter L. Venetianer
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Abstract
A system and method for improving a video characteristic of a video stream is described. According to various implementations of the invention, a changed region between a later-in-time image frame and an earlier-in-time image frame and an unchanged region between such two image frames are determined. A new improvement to the video characteristic is determined and applied to the changed region of the later-in-time image frame. A prior improvement to the video characteristic that was determined for the earlier-in-time image frame is applied to the unchanged region of the later-in-time image frame.
Claims20
A method for improving contrast in a plurality of image frames captured by a video camera, the method comprising:
- generating, by a computing processor, a first transformation function that improves contrast of a first frame of the plurality of image frames;
- applying, by a computing processor, the first transformation function to the first frame to improve the contrast of the first frame;
- determining, by a computing processor, a changed region in a second frame of the plurality of image frames in relation to the first frame of the plurality of the image frames and an unchanged region of the second frame of the plurality of image frames in relation to the first frame of the plurality of the image frames;
- generating a second transformation function corresponding to the changed region of the second frame;
- applying the second transformation function to the changed region of the second frame to improve the contrast of the changed region;
- and
- applying the first transformation function to the unchanged region of the first frame to improve the contrast of the unchanged region.
A method for improving contrast of a plurality of image frames in a video stream captured by a video camera, the method comprising:
- determining, by a computing processor, a first CLAHE transformation for each of a plurality of regions of an earlier-in-time image frame of the plurality of image frames;
- determining, by the computing processor, a changed region of a later-in-time image frame of the plurality of image frames relative to the earlier-in-time image frame and an unchanged region of the later-in-time image frame of the plurality of image frames relative to the earlier-in-time image frame;
- determining, by the computing processor, a new CLAHE transformation for the changed region of the later-in-time image frame of the plurality of image frames;
- applying, by the computing processor, the first CLAHE transformation to the unchanged region of the later-in-time image frame of the plurality of image frames;
- and
- applying, by the computing processor, the new CLAHE transformation to the changed region of the later-in-time image frame of the plurality of image frames.
A method for improving an image characteristic of a plurality of image frames in a video stream captured by a video camera, the method comprising:
- determining, by a computing processor, a first improvement to the image characteristic for a first frame of the plurality of image frames;
- determining, by a computing processor, a changed region of a second frame of the plurality of image frames in relation to the first frame of the plurality of the image frames and an unchanged region of the second frame of the plurality of image frames in relation to the first frame of the plurality of the image frames;
- determining, by a computing processor, a second improvement to the image characteristic for the changed region of the second frame of the plurality of image frames;
- applying, by a computing processor, the first improvement to the image characteristic of the unchanged region of the second frame of the plurality of image frames;
- and
- applying, by a computing processor, the second improvement to the image characteristic of the changed region of the second frame of the plurality of image frames.
Dependencies are inferred from the claim text.