The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 10, 1991
Filed:
May. 24, 1990
David D Pape, Framingham, MA (US);
Wanda T Reiss, Lexington, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A defect correction apparatus for a solid state imaging device employs a frame buffer responsively coupled to the imaging device for storing digital values of shuttered dark pixel data from image locations of the imaging device. A register responsively coupled to the imaging device and having an output coupled to the buffer sequentially clocks digital values of image pixel data of the imaging device into the frame buffer. A comparator having an output operatively coupled to the register and being responsively coupled to the dark pixel data of the frame buffer produces enable and inhibit outputs. When any selected element of dark pixel data is less than a threshold, indicative of an operative pixel element in the imaging device, data stored in the register corresponding to the pixel is stored in the frame buffer in response to the enable signal. When the value of the dark pixel data in the frame buffer is greater than the threshold the comparator produces an inhibit signal. The value of image data of a previous operative pixel element is thereby entered into the register and frame buffer.