Additional information superposing method, information signal copy control method, information signal output device and information signal recording device
First Claim
1. A method of superposing second additional information on an information signal, comprising the steps of:
- a first step of generating first and second electronic watermarking information corresponding to first and second additional information; and
a step of superposing said first electronic watermarking information on a first area of an information signal and superposing said second additional electronic watermarking information on a second area of said information signal;
wherein the first additional information and the second additional information are information for limiting a copy generation of said information signal; and
wherein the first additional information represents a state before the copy generation is limited, and the second additional information represents a state after the copy generation is limited.
1 Assignment
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Accused Products
Abstract
An image signal to be outputted is divided into two areas or a first area and a second area. In an electronic watermarking information forming section (WM forming section), a spectrum spread signal (electronic watermarking information) is formed as the first additional information so as to be superposed on the first area of the image signal. The spectrum spread signal is superposed on the first area of the image signal by an electronic watermarking information superposing section (WM superposing section). Moreover, in the case where the image signal is recorded on a recording medium, for example, the second additional information is newly superposed on the second area of the image signal. Thus, deterioration of the information signal is suppressed at minimum, and first and second additional information are superposed on the information signal to be capable of transmitting the information signal.
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Citations
25 Claims
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1. A method of superposing second additional information on an information signal, comprising the steps of:
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a first step of generating first and second electronic watermarking information corresponding to first and second additional information; and
a step of superposing said first electronic watermarking information on a first area of an information signal and superposing said second additional electronic watermarking information on a second area of said information signal;
wherein the first additional information and the second additional information are information for limiting a copy generation of said information signal; and
wherein the first additional information represents a state before the copy generation is limited, and the second additional information represents a state after the copy generation is limited. - View Dependent Claims (2, 3, 4, 5)
said information signal is an image signal; and
said first area and said second area are formed in a time direction by using a frame or field as a unit.
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5. The additional information superposing method according to claim 1, characterized in that:
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said information signal is an image signal; and
said first area and said second area are formed separately within one frame or one field.
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6. An information signal copy control method for an information signal on which additional information is added, comprising steps of:
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a step of detecting electronic watermarking information superposed on a first area of an information signal and corresponding to a first additional information;
a step of judging whether or not second electronic watermarking information corresponding to second additional information is superposed on a second area of the information signal based on detected electronic watermarking information corresponding to said first additional information; and
a step of superposing second electronic watermarking information on a second area of said information signal based on a judged result;
wherein the first additional information and the second additional information are information for limiting a copy generation of said information signal; and
wherein the first additional information represents a state before the copy generation is limited, and the second additional information represents a state after the copy generation is limited. - View Dependent Claims (9, 10, 11, 12)
said information signal is an image signal; and
said first area and said second area are formed in a time direction by using a frame or field as unit.
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12. The information signal copy control method according to claim 6, characterized in that:
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said information signal is an image signal; and
said first area and said second area are formed separately within one frame or one field.
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7. An information signal copy control method for an information signal having first and second areas to which first and second additional information are respectively added, comprising the steps of:
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a step of detecting electronic watermarking information superposed on a second area of an information signal corresponding to a second additional information;
a step of judging whether or not first electronic watermarking information corresponding to a second information signal is superposed on a second area of said information signal based on electronic watermarking information corresponding to said second additional information detected; and
a step of superposing second electronic watermarking information on the second area of said information signal again based on a judged result;
wherein the first additional information and the second additional information are information for limiting a copy generation of said information signal; and
wherein the first additional information represents a state before the copy generation is limited, and the second additional information represents a state after the copy generation is limited.
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8. An information signal copy control method for an information signal added with additional information, comprising the steps of:
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a step of detecting electronic watermarking information corresponding to first additional information superposed on a first area of an information signal and electronic watermarking information corresponding to second additional information superposed on a second area of said information signal; and
a step of controlling recording of said information signal based on the first and second electronic watermarking information corresponding to said first and second additional information detected, and superposing electronic watermarking information corresponding to second additional information on said second area again;
wherein the first additional information and the second additional information are information for limiting a copy generation of said information signal; and
wherein the first additional information represents a state before the copy generation is limited, and the second additional information represents a state after the copy generation is limited.
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13. An information signal output device for outputting an information signal which is divided into a first area and a second area and where first additional information comprising electronic watermarking information is superposed on said first area and second additional information comprising electronic watermarking information is superposed on said second area, said information signal output device being characterized by comprising:
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a second additional information detecting means for detecting the second additional information superposed on said second area; and
an output control means for controlling an output of said information signal based on a detected output from said second additional information detecting means;
wherein the first additional information and the second additional information are information for limiting a copy generation of said information signal; and
wherein the first additional information represents a state before the copy generation is limited, and the second additional information represents a state after the copy generation is limited. - View Dependent Claims (15, 16, 17, 18)
said information signal is an image signal; and
said first area and said second area are formed in a time direction by using a frame or field as a unit.
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18. The information signal output device according to claim 13, characterized in that said first area and said second area are formed separately within one frame or one field.
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14. An information signal output device for outputting an information signal which is divided into a first area and a second area and where first additional information comprising electronic watermarking information is superposed on said first area and second additional information comprising electronic watermarking information is superposed on said second area, said information signal output device being characterized by comprising:
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a first additional information detecting means for detecting said first additional information superposed on said first area;
a second additional information detecting means for detecting said second additional information superposed on said second area; and
an output control means for controlling an output of said information signal based on a detected output from said first additional information detecting means and a detected output from said second additional information detecting means;
wherein the first additional information and the second additional information are information for limiting a copy generation of said information signal; and
wherein the first additional information represents a state before the copy generation is limited, and the second additional information represents a state after the copy generation is limited.
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19. An information signal recording device for recording an information signal which is divided into a first area and a second area and where first additional information comprising electronic watermarking information is superposed on said first area and second additional information comprising electronic watermarking information is superposed on said second area, said recording device characterized by comprising:
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a digital interface for being provided with said information signal;
a first additional information detecting means for detecting additional information superposed on said first area of said information signal provided via said digital interface;
a recording control means for controlling recording of said information signal based on a detected output from said first additional information detecting means; and
a superposing means for, when said information signal is to be recorded on a recording medium by said recording control means, forming the second additional information if necessary so as to superpose it on said second area;
wherein the first additional information and the second additional information are information for limiting a copy generation of said information signal; and
wherein the first additional information represents a state before the copy generation is limited, and the second additional information represents a state after the copy generation is limited. - View Dependent Claims (22, 23, 24, 25)
said information signal is an image signal; and
said first area and said second area are formed in a time direction by using a frame or field as a unit.
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25. The information signal recording device according to claim 19, characterized in that:
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said information signal is an image signal; and
said first area and said second area are formed separately within one frame or one field.
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20. An information signal recording device for recording an information signal which is divided into a first area and a second area and where first additional information comprising electronic watermarking information is superposed on said first area and second additional information comprising electronic watermarking information is superposed on said second area, said information signal recording device characterized by comprising:
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a second additional information detecting means for detecting additional information superposed on said second area of said information signal;
a recording control means for controlling recording of said information signal based on a detected output from said second additional information detecting means; and
a superposing means for, when said information signal is to be recorded on a recording medium by said recording control means, forming the second additional information if necessary so as to superpose it on said second area;
wherein the first additional information and the second additional information are information for limiting a copy generation of said information signal; and
wherein the first additional information represents a state before the copy generation is limited, and the second additional information represents a state after the copy generation is limited.
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21. An information signal recording device for recording an information signal which is divided into a first area and a second area and where first additional information comprising electronic watermarking information is superposed on said first area and second additional information comprising electronic watermarking information is superposed on said second area, said information signal recording device characterized by comprising:
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a first additional information detecting means for detecting additional information superposed on said first area of said information signal;
a second additional information detecting means for detecting additional information superposed on said second area of said information signal;
a recording control means for controlling recording of said information signal based on a detected output from said first additional information detecting means and a detected output from said second additional information detecting means; and
a superposing means for, when said information signal is recorded on a recording medium by said recording control means, forming the second additional information if necessary so as to superpose it on said second area.
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Specification