Charge coupled device based system and method for inspecting and modifying images
AssigneeRCA Corporation
InventorRobert A. Duschl
Life of this patent
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Abstract
A system for inspecting images projected onto a charge coupled device (CCD) compares the image cast onto the CCD by an object to be inspected with an optimum reference image to identify and locate faults in the object being inspected, or to modify the image to match the reference.
Claims15
A system for inspecting an image projected onto a CCD from an image source wherein said CCD stores pixel data from said image on a plurality of pixels comprising:
- output circuitry and a data transfer and address generator for transferring frames of said pixel data from each of said CCD pixels to said output circuitry whereby said data from each of said pixels has a unique address;
- means of storing a reference frame representative of a reference image, said reference frame having an optimum reference pixel signal for each of said CCD pixels;
- variable frame store means for initially storing said CCD pixel data, and wherein said CCD pixel data are sequentially replaced by modified pixel signals for each pixel of said CCD;
- and
- means for receiving and for comparing said pixel data and said reference pixel signals, and providing said modified pixel signals to said variable frame store means whereby a frame of modified pixel data exists in said variable frame store means.
A system for inspecting images projected onto a CCD from an image source wherein said CCD stores pixel signals from said image on a plurality of pixels comprising:
- output circuitry and a data transfer and address generator for transferring a frame of said pixel signals from each of said CCD pixels to said output circuitry whereby each of said pixel signals has a unique address;
- means for storing a reference frame representative of a reference image, said reference image having a reference pixel signal for each of said CCD pixels;
- variable frame store means for storing said pixel signals;
- and
- means for receiving said pixel signals and said reference pixel signals and providing difference signals representative of the difference between said pixel signals and said reference pixel signals.
A method of modifying an image projected onto a charged coupled device (CCD) comprising the steps of:
- transferring a frame of pixel image data from said CCD to a variable storage means;
- providing a reference frame having a reference pixel signal for each pixel of said CCD;
- providing a difference pixel signal in accordance with the difference between said pixel image data and said reference pixel signal;
- modifying said pixel image data in said variable storage means with said difference pixel signals to provide a frame of modified pixel image signals in said variable storage means.
Dependencies are inferred from the claim text.