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While it was easy to spot cameras twenty years ago due to their large size, this. Document available augistyn http: During the last few years the number of surveillance cameras has grown out of bounds.

Cameras have been installed in many public and semi-public places such as universities. About 25 million CCTV 1 cameras are estimated to be in operation worldwide at.

Some countries, notably Great Britain, are trying to fully cover. These efforts result in a. In the near ahgustyn cameras may even be installed in all taxis, keeping an eye on. In Houston, Texas, about cabs have been equipped with such.

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It may not be obvious right away why it could be of any importance to anyone to. Some will reason that concealed cameras are more or. Contrary to common belief, hidden cameras are nowhere close to exotic. A survey conducted by the American Manage. Subminiature cameras were even discovered by the author of this paper during treat. Ease of use and the drop.


Due to this it is not.

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There is a growing number of reports of covert cameras spying on. Often even legally installed and.

Especially the growing use. This is why persons who consider face recognition to touch their. This is not possible unless the presence.

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In countries with lenient privacy protection. Be assured that searching for covert cameras is in no way trivial. The capsule contains a. Given the size of those cameras it should. The focus of this paper will be on electronic cameras. They facilitate real time. On the other hand photographic cameras provide images far. Ancient electronic cameras used camera tubes [22, 23] to convert the virtual image.

There are several tube designs [24] which. Although there are still. Therefore this paper will focus on modern semiconductor. The camera does not need to be in the same room as the object under surveillance.

One advantage of this. Lenses prepared this way can not be detected. Still another advantage is that otherwise inaccessible rooms can. Lenses obscured as nail. Alternatively the lens may be masked as a shirt button. CCD 2 cameras are much smaller than tube based cameras and consume far less power. Particularly interesting for covert surveillance are. Subminiature here means something like 32 mm.


CCD cameras are available as monochrome i. Pinhole lens cameras are particularly interesting for. Monochrome cameras usually are more light. Historically the major advantage of CCD cameras has been superior picture quality. Compared to CMOS cameras. In addition they have rather low dynamic range. This means that CCD cameras will fail to record very. Bright parts of the picture will be.

Black and white CCD cameras are sensitive not only to human visible light but also. This can be demonstrated by having the. This offers some interesting possibilities. This enables personnel to. Another type of camera which has shown up recently in the catalogues of electronics.

CMOS cameras were quite rare a few years. They are available as monochrome and color version with several. Subminiature CMOS cameras usu. They are about half the price of CCD cameras, less. They can be built much smaller than CCD cameras as major. CMOS cameras have disadvantages as well.

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Because each pixel comes with a. Another disadvantage is the lower picture. CMOS cameras available which attempt to cancel out the noise, but those are more. For more detailed comparisons of CMOS and.

CCD cameras see [32].