Video image quality
First Claim
1. One or more processor-accessible computer readable medium comprising processor-executable instructions that, when executed, direct a computing device to perform actions comprising:
- selecting, via the computing device, training pixels from an image frame based on a defined skin color range;
building a skin-color model using the selected training pixels;
detecting a skin portion of the image frame using the skin-color model; and
adjusting the image frame with regard to the detected skin portion.
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Accused Products
Abstract
Video image quality may be improved by correcting exposure levels and/or enhancing contrast amounts on each frame. One or more of the following phases may be implemented: skin-color model building, face detecting, exposure level correcting, and contrast enhancing. In a described implementation, a Gaussian skin-color model is built for each image frame during runtime. The Gaussian skin-color model is built with training pixels that are selected responsive to a defined skin color range, which is created offline from manually-selected skin pixels of multiple test sequences. In another described implementation, each pixel of an image frame is re-exposed using a ratio of contrast amount control variables (CACVs). More specifically, a pixel may be converted to a corresponding light intensity using a first CACV, and the corresponding light intensity may be reconverted to a pixel using a second CACV to enhance the contrast and possibly reduce fuzziness of the image frame.
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Citations
39 Claims
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1. One or more processor-accessible computer readable medium comprising processor-executable instructions that, when executed, direct a computing device to perform actions comprising:
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selecting, via the computing device, training pixels from an image frame based on a defined skin color range; building a skin-color model using the selected training pixels; detecting a skin portion of the image frame using the skin-color model; and adjusting the image frame with regard to the detected skin portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device, comprising:
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one or more processors; and memory having instructions executable by the one or more processors, the memory including; a data collection module to accept a defined skin color range and an image frame as an input; a selection module to select training pixels from the image frame based on the defined skin color range; and a skin-color model builder module to build a skin-color model at runtime for the image frame using the selected training pixels. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An arrangement for video image processing in conjunction with skin color modeling, the arrangement comprising:
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selection means for selecting training pixels from an image frame using a predefined skin color range; build means for building a skin-color model using the selected training pixels; and detection means for detecting a skin portion of the image frame using the skin-color model. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. A method, comprising:
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building a skin-color model, via a computing device, for an image frame using a defined skin color range; detecting a facial portion in the image frame using the skin-color model; and correcting an exposure level of the image frame based on a luminance value of the detected facial portion. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A runtime method comprising:
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using a selecting module for selecting training pixels from an image frame based on a predefined skin color range, the predefined skin color range created offline; using a skin color model builder module for building a Gaussian skin-color model using the selected training pixels; using a detecting module for detecting a facial portion of the image frame using the Gaussian skin-color model and a skin pixel probability threshold; and using a correcting module for correcting an exposure level of the image frame with regard to the detected facial portion.
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Specification