Image detection device having correction circuit for removing artifacts due to delayed charge transfer
Patent 5530238 Issued on June 25, 1996. Estimated Expiration Date: 
September 1, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 1, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCharge coupled device image sensors Recursive filter and image display apparatus including the same Digital X-ray image read apparatus with a correction function Sensor matrix Radiation detector offset and afterglow compensation technique Patent #: 5331682 InventorsApplicationNo. 299774 filed on 09/01/1994US Classes:250/208.1, Plural photosensitive image detecting element arrays250/370.09, X-ray or gamma-ray system348/250, In charge coupled type sensor378/98.8With solid-state image detectorExaminersPrimary: Westin, Edward P.Assistant: Lee, John D. Attorney, Agent or FirmForeign Patent References
International ClassesH04N 003/14H04N 005/32 Foreign Application Priority Data1993-09-03 EPAbstractAn image detection device, notably a semiconductor image detection array for detecting x-ray images, is provided wherein perturbations due to phantom-images are substantially mitigated. In such an image detection array incident image carrying radiation is converted into charges. Delayed charge transfer due to trapping of charges in the semiconductor material of radiation sensor elements causes such perturbations. In an image detection device according to the invention a correction circuit is provided which is arranged to form an image correction signal being representative of delayed transferred charges. In a particular embodiment of an image detection device according to the invention the image correction signal is formed as a superposition of exponentially decaying signals of images which were detected before the detection of a currently detected image. An image signal containing artifacts due to delayed charge transfer is formed by a read-out circuit whereto charges formed by the radiation sensor elements are transferred. A corrected image signal is subsequently formed from the image correction signal and the signal formed by the multiplex circuit.Field of SearchPlural photosensitive image detecting element arraysWith imaging With imaging With camera Using a stimulable phosphor With image read-out Including noise or undesired signal reduction Smear In charge coupled type sensor In charge coupled type sensor Solid-state image sensor Including switching transistor and photocell at each pixel site (e.g., "MOS-type" image sensor) Charge-coupled architecture Field or frame transfer type With image subtraction or addition With solid-state image detector COMPUTER TOMOGRAPHY PROGRAM OR PROCESSOR | |
