Horizontal line interpolation circuit and image pickup apparatus

Details Horizontal line interpolation circuit and image pickup apparatus Horizontal line interpolation circuit and image pickup apparatus

1991-09-24

1993-12-07

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, 358160, H04N 5208

Patent

active

052687589

ABSTRACT:
An image pickup apparatus includes an image sensor for simultaneously reading signals of adjoining two horizontal pixel rows by one-time horizontal scan; an electronic zoom circuit for enlargement-processing an output signal of the image sensor; an operation switch for instructing for on/off control of electronic zoom operation; and a scan method switching circuit for controlling scan method of the image sensor according to with an instruction from the operation switch. The scan method switching circuit exerts control so that, when the electronic zoom operation is turned on, a pair of two horizontal pixel rows to be read simultaneously in the odd and even fields are made identical, and when the electronic zoom operation is turned off, a pair of two horizontal pixel rows to be read simultaneously in the odd and even fields are shifted by one row in the vertical direction. In this image pickup apparatus, the positions of lines having high vertical frequency responses and those of lines having low vertical frequency responses are approximately reversed between the odd and even fields, so that the vertical frequency response is made uniform over the entire screen as a one-frame image.

REFERENCES:
patent: 4200887 (1980-04-01), Van Den Avoort
patent: 4698673 (1987-10-01), Johnson
patent: 4746985 (1988-05-01), Waldron
patent: 5083204 (1992-01-01), Heard

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