Key signal generating apparatus and picture synthesis apparatus, and key signal generating method and picture synthesis method
First Claim
1. A key signal generating apparatus adapted for generating a key signal from picture,key signal generating means for generating the key signal on the basis of the change of the pixel value outputted from the change detecting means;
- wherein the key signal generating means is adapted so that in the case where alias takes place in the picture, it generates the key signal for allowing the influence of that alias to be reduced.
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Abstract
In this invention, when the portion from which a key signal α is to be generated of picture is caused to be foreground F, the portion except for the above is caused to be background B, and pixel value of pixels constituting that picture is designated at C, the key signal α is generated so as to satisfy the relational expression C'"'"'=(F-B)α'"'"'('"'"'(prime) represents differentiation). In more practical sense, a change detecting section 10 calculates change C'"'"' of pixel value between pixels constituting picture, and an F-B detecting section 30 calculates difference F-B between the foreground and the background. In addition, an integral value calculating section 40 divides the change C'"'"' by the difference F-B to integrate the result obtained by divisional operation to thereby determine key signal α. As a result, precise key signal can be obtained in this invention.
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Citations
28 Claims
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1. A key signal generating apparatus adapted for generating a key signal from picture,
key signal generating means for generating the key signal on the basis of the change of the pixel value outputted from the change detecting means; wherein the key signal generating means is adapted so that in the case where alias takes place in the picture, it generates the key signal for allowing the influence of that alias to be reduced. - View Dependent Claims (4, 7, 8, 9, 10, 11)
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2. A key signal generating apparatus adapted for generating a key signal from picture, the apparatus comprising:
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change detecting means for detecting change of pixel value between pixels constituting the picture; integrating means for integrating the change information indicating the change in the pixel values outputted by said change detection means; and key signal generating means for generating the key signal on the basis of an integrated value outputted by said integrating means; wherein the key signal generating means is adapted so that in the case where motion blur takes place in the picture, it generates the key signal in which that motion blur is reflected.
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3. A key signal generating apparatus adapted for generating a key signal from picture, the apparatus comprising:
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change detecting means for detecting change of pixel value between pixels constituting the picture; integrating means for integrating the change information indicating the change in the pixel values outputted by said change detection means; and key signal generating means for generating the key signal on the bases of an integrated value outputted by said integrating means; wherein the key signal generating means is adapted so that in the case where alias takes place in the picture, it generates the key signal for allowing the influence of that alias to be reduced.
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5. A key signal generating apparatus adapted for generating a key signal from picture, the apparatus comprising:
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the change detecting means for detecting change of pixel value between pixels constituting the picture; integrating means for integrating the change information indicating the change in the pixel values outputted by said change detection means; and key signal generating means for generating the key signal on the basis of an integrated value outputted by said integrating means; wherein the picture consists of foreground picture and background picture, wherein the apparatus further comprises difference detecting means for detecting difference between the foreground picture and the background picture to output difference information indicating that difference, wherein the change detecting means outputs change information indicating change of the pixel value, and wherein the key signal generating means generates the key signal on the basis of the difference information and the change information, and comprises; normalizing means for normalizing the change information by the difference information to output normalized information obtained as the result of the normalization, and integration executing means for integrating the normalized information along a predetermined integral path. - View Dependent Claims (6)
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12. A picture synthesis apparatus adapted for receiving a first picture consisting of at least foreground picture and background picture, and a second picture consisting of at least background picture to synthesize the foreground picture of the first picture and the background picture of the second picture, the apparatus comprising:
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change detecting means for detecting change of pixel value between pixels constituting the first picture; integrating means for integrating the change information indicating the change in the pixel values outputted by said change detection means; key signal generating means for generating a key signal on the basis of an integrated value outputted by said integrating means; and synthesis means for synthesizing the foreground picture of the first picture and the background picture of the second picture by using the key signal generated by the key signal generating means. - View Dependent Claims (13, 14)
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15. A key signal generating method of generating a key signal from a picture,
the method comprising the steps of: -
detecting change of pixel value between pixels constituting the picture; integrating the change information indicating the change in the pixel values; and generating the key signal on the basis of an integrated value. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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16. A key signal generating method of generating a key signal from picture, the method comprising the steps of:
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detecting change of pixel value between pixels constituting the picture; integrating the change information indicating the change in the pixel values; and generating the key signal on the basis of an integrated value; wherein in the case where motion blur takes place in the picture, the key signal in which that motion blur is reflected is generated.
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17. A key signal generating method of generating a key signal from a picture, the method comprising the steps of:
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detecting change of pixel value between pixels constituting the picture; integrating the change information indicating the change in the pixel values; and wherein in the case where alias takes place in the picture, the key signal for allowing the influence of the alias to be reduced is generated.
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26. A picture synthesis method of receiving a first picture consisting of at least foreground picture and background picture and a second picture consisting of at least background picture to synthesize the foreground picture of the first picture and the background picture of the second picture,
the method comprising the steps of: -
detecting change of pixel value between pixels constituting the first picture; integrating the change information indicating the change in the pixel values; generating a key signal on the basis of an integrated value; and synthesizing the foreground picture of the first picture and the background picture of the second picture by using the key signal. - View Dependent Claims (27, 28)
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Specification