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AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsKazuaki Kojima, Tetsuya Kuno, Hiroaki Sugiura, Takeshi Yamada
Estimating the term…
A method and apparatus for adjusting a color difference signal of an image includes a video signal processor. The video signal processor receives a luminance signal and color difference signals representing the image, and accesses a color saturation level from a color saturation level table stored in memory based on the color difference signals. The video signal processor then detects flesh tone in areas of the image based on the luminance signal and the color saturation level, and generates a flesh tone detecting signal based on results of the flesh tone detection.
A method of adjusting a color difference signal of an image in a video signal processor comprising the steps of:
A video signal processor, comprising:
A method of adjusting a color difference signal of an image in a video signal processor comprising the steps of:
A video signal processor, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the…:…
Circuits for processing colour signals: hue control means, e.g. flesh tone control
Circuits for processing colour signals: for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction,…
Circuitry for compensating brightness variation in the scene: circuitry for evaluating the brightness variation
Term ended 10 Jun 2014 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to the processing of video signals for a color video camera.
2. Description of Related Art
FIG. 1 is a block diagram of a prior art video signal processor;
FIG. 2 is a block diagram of another prior art video signal processor;
FIG. 3 is a block diagram of still another prior art video signal processor;
The preferred embodiments of the present invention will now be described below with reference to the accompanying drawings.
(Embodiment 1)
FIG. 8 is a diagram showing an example of flesh-tone area detection according to a first embodiment. As shown in FIG. 8, a closed area (indicated by oblique hatching) in a two-dimensional plane defined by R-Y and B-Y axes representing color-difference video signals is detected as a flesh-tone area. The flesh-tone area detected in this manner varies according to the level of the luminance signal. That is, as the level of the luminance signal increases, the flesh-tone area is made to vary in size and position from (a) to (b) to (c) as shown in FIG. 9, thus enhancing the accuracy of flesh-tone area detection.