Method and apparatus for independently calibrating light source and photosensor arrays
December 19, 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 ReferencesOptical measurement apparatus Optical signal generating apparatus and optical power meter calibrating system using the same Synthetic aperture optical imaging system Calibration system and method for color image scanning Doubly correlated sample and hold circuit Adjustable calibration assembly for a guidance system Optical calibration of towed sensor array Method of measuring the reflection density of an image Method and sensor for opto-electronic angle measurements Apparatus for calibrating an optical instrument, and applications thereof InventorsApplicationNo. 574707 filed on 12/19/1995US Classes:348/241, Including noise or undesired signal reduction250/205, Controlling light source intensity702/104Sensor or transducerExaminersPrimary: Garber, Wendy R.Attorney, Agent or FirmForeign Patent References
International ClassH04N 003/14AbstractA method of calibrating an image sensor having an array of pixel sensor sites, and an area light source having a corresponding array of pixel emission sites, comprising the steps of:a. measuring the output of the light source in a first region with a radiometer to generate an absolute measured light value;b. identifying a first region of the image sensor corresponding to the first region of the light source;c. successively positioning, reading out, and stepping the image sensor with respect to the light source to create a first file of pixel values representing one pixel in the first region of the sensor that has read every pixel in the first region of the source, and a second file of pixel values representing one pixel in the source that has been read by every pixel in the first region of the sensor;d. calibrating each pixel in the first region of the light source using the absolute measured light value and the pixel values in the first file;e. calibrating each pixel in the first region of the sensor using the calibrated value of one pixel in the first region of the light source and the pixel values in the second file; andf. repositioning the sensor with respect to the light source and calibrating an uncalibrated second region of sensor with the calibrated first region of the source, and calibrating an uncalibrated second region of the light source with the calibrated first region of the sensor. | |
