Defective pixel correction circuit
September 8, 2015. 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 ReferencesError concealment system using dropout severity information for selection of concealment method Neighborhood image processing stage for implementing filtering operations Pixel defect correction apparatus Method for enhancing image data by noise reduction or sharpening Image processing apparatus Solid state imaging device with adaptive pixel correction Image defect correcting circuit for a solid state imager Patent #: 5144446 InventorsAssigneeApplicationNo. 455153 filed on 05/31/1995US Classes:348/246, Defective pixel (e.g., signal replacement)348/241, Including noise or undesired signal reduction348/247, With memory of defective pixels348/250, In charge coupled type sensor348/615, Blackspot or shading correction (e.g., corrects for fixed pattern defects)348/616, Dropout compensator (e.g., replacement type)382/308Morphological operations (i.e., local neighborhood operations)ExaminersPrimary: Peng, John K.Assistant: Lo, Linus H. Attorney, Agent or FirmForeign Patent References
International ClassH04N 009/64Foreign Application Priority Data1994-06-06 JPAbstractA defective pixel correction circuit corrects a defective pixel in a solid imaging device such as a CCD exactly and sufficiently. A boundary detection circuit calculates magnitudes of boundaries from signals of eight peripheral pixels taken in a pixel taking-in circuit and a boundary ordering circuit compares the calculated magnitudes of the boundaries with one another to order the magnitudes of the boundaries. An interpolation circuit produces an interpolation signal in accordance with an interpolation method determined by an interpolation method determining circuit on the basis of the order of the ordered boundaries to correct the defective pixel.Field of SearchDefective pixel (e.g., signal replacement)With memory of defective pixels Using dummy pixels In charge coupled type sensor With transition or edge sharpening (e.g., aperture correction) Noise or undesired signal reduction Including noise or undesired signal reduction Blackspot or shading correction (e.g., corrects for fixed pattern defects) Dropout compensator (e.g., replacement type) For color television Edge or contour enhancement Morphological operations (i.e., local neighborhood operations) Image filter Pipeline processing Pattern boundary and edge measurements Electronic template At multiple image orientations or positions Local neighborhood operations (e.g., 3x3 kernel, window, or matrix operator) Calculating weighted similarity or difference (e.g., don`t-care areas) | |
