Imaging system including an optical system compressing a circula

Details Imaging system including an optical system compressing a circula Imaging system including an optical system compressing a circula

1991-07-31

1993-06-01

Razavi, Michael T.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358209, 250216, H04N 5225, H04N 530, H01J 314, H01J 516

Patent

active

052165124

ABSTRACT:
An imaging system includes an image pick-up device with an image sensor having a rectangular detection face which is subdivided into discrete detection sub-faces for converting a radiation intensity distribution on the detection face into an electric signal, the detection sub-faces being arranged in a matrix of n rows and p columns respectively dividing short and long sides of the detection face, an object plane and an optical system which images a radiation intensity distribution in a circle situated in the object plane onto an ellipse situated on the detection face in accordance with a compression factor m. The compression factor may be chosen so that the ellipse spans no more than p/2 columns of the detection face so that video images can be formed at twice the conventional rate. In the case of non-square detection sub-faces, the compression rate may be chosen so that the ellipse spans an equal number of rows and columns, thereby making each detection sub-face correspond to a square in the object plane. When several, mutually shifted image sensors are used, the compression rate of the optical system is adapted to correct a decrease in effective dimension of the detection sub-faces. A CCD sensor is used in an imaging system operating according to the NTSC standard by utilizing correct image compression.

REFERENCES:
patent: 4857724 (1989-08-01), Snoeren

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