Apparatus for correcting for defective pixels in an image sensor

Details Apparatus for correcting for defective pixels in an image sensor Apparatus for correcting for defective pixels in an image sensor

1993-04-06

1995-01-10

Mancuso, Joseph

Television

Camera, system and detail

Combined image signal generator and general image signal...

348247, H04N 314

Patent

active

053811755

ABSTRACT:
A solid state image pickup apparatus comprises a solid state imager having a plurality of pixels and which outputs a signal corresponding to light incident thereon, a sample and hold circuit for sampling and holding analog output signals from respective pixels of the solid state imager in response to a sampling signal, a low-pass filter connected to the analog output of the sample and hold circuit for eliminating a high frequency component therefrom so as to output a filtered signal, an analog-to-digital converter for converting the filtered signal to a digital filtered signal, a memory for storing position data indicative of a position of a defective pixel, a circuit for stopping the supply of the sampling signal to the sample and hold circuit in response to the position data indicating a defective pixel so that the output signal from the defective pixel is replaced with the analog output signal from a pixel read immediately prior thereto, an interpolating circuit connected to the analog-to-digital converter for interpolating a digital signal corresponding to the position data indicating a defective pixel by using the digital signals corresponding to other pixels surrounding the defective pixel so as to generate an interpolated signal, and a switch for selectively outputting the digital filtered signal and the interpolated signal in accordance with the position data.

REFERENCES:
patent: 4894721 (1990-01-01), Matsuda
patent: 5144446 (1992-09-01), Sudo et al.
patent: 5198906 (1993-03-01), Yamashita

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