Self-adapting method and device for the inlaying of color video images
First Claim
1. A method for inlaying color video images, including the generation of a switching signal, or dividing key signal, to which a gain is applied in order to extract from a source image a subject placed in front of an original background of uniform color, and carrying out a mixing of the subject with a new background image, comprising the steps of:
- detecting background/subject and subject/background transitions dynamically in the source image according to distance values between points of the subject and points of the background,defining a contour of the subject as an outer perimeter edge region around the subject and having a variable width depending upon determined characteristics of the detected transition, said width being calculated, at each transition, from the evolution of the distance values of localized points around the transition, andapplying the gain only to selected points of the source image belonging to the contour of the subject, and in proportion to the distance value between said selected points and points of said original background.
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Abstract
The method for the inlaying of color video images consists on the one hand in generating a switching signal, or dividing key, applying a gain on the image points belonging to the contour of the subject to be inlaid, in proportion to the distance value (DIST) between the color of the point and that of the back-ground, and on the other hand in carrying out a mixing of the source image and a new background image which is a function of the value of the dividing key signal at the point in question and such that the values of the source signal and of the new background signal are fixed at constants over the width of the contour.
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Citations
11 Claims
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1. A method for inlaying color video images, including the generation of a switching signal, or dividing key signal, to which a gain is applied in order to extract from a source image a subject placed in front of an original background of uniform color, and carrying out a mixing of the subject with a new background image, comprising the steps of:
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detecting background/subject and subject/background transitions dynamically in the source image according to distance values between points of the subject and points of the background, defining a contour of the subject as an outer perimeter edge region around the subject and having a variable width depending upon determined characteristics of the detected transition, said width being calculated, at each transition, from the evolution of the distance values of localized points around the transition, and applying the gain only to selected points of the source image belonging to the contour of the subject, and in proportion to the distance value between said selected points and points of said original background. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for inlaying of color video images, including the generation of a switching signal, or dividing key signal, to which a gain is applied in order to extract from a source image a subject placed in front of an original background of uniform color, and including mixing of the subject with a new background image, comprising:
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interpolating means for interpolation of color difference signals; computing means for computing a luminance dividing key in accordance with said color difference signals; low pass filter means for performing low pass filtering having an input for receiving the luminance dividing key signal and an output for supplying a dividing key signal which allows the inlaying of the color deference signals; means for inlaying the color difference signal shaving an input for receiving the color difference signals, source and background signals, an the dividing key signal; means for inlaying a luminance signal having an input for receiving source and background luminance signals and the dividing key signal; and means for inlaying details, shadows and transparencies, having an input for receiving the luminance signals and color difference signals of the source signal and of the video signal after inlaying as well as the dividing key signal, wherein a final inlayed image is obtained. - View Dependent Claims (11)
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Specification