Back to results
US 7,453,502 B2Granted
Lens shading algorithm
AssigneeDigital Imaging Systems GmbH
InventorDetlef Schweng
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeDigital Imaging Systems GmbH
InventorDetlef Schweng
Estimating the term…
A method used for the compensation of vignetting in digital cameras has been achieved. The compensation for vignetting is performed by multiplying pixel output of the sensor array with a correction factor. In a preferred embodiment of the invention all pixels are multiplied with an adequate correction factor. Alternatively pixels, being close to the center of the sensor array, can be left unchanged. Said correction factor can be calculated in a very fast and efficient way by using two constant factors describing the specific geometry of the lens/sensor array system and by multiplying a first of said factors with the square of the distance between a pixel and the center of the sensor array and by multiplying a second of said factors with the distance between a pixel and the center of the sensor array to the power of four. The result of the second multiplication is subtracted from the result of the first multiplication and this result is added to one to get the final correction factor. Each original pixel output is multiplied with said correction factor to get output data compensated for the vignetting effects of the lens.
A method to compensate vignetting in digital cameras comprising a multiplication of each pixel output of the array sensor of the camera with a variable correction factor defined for each pixel, wherein said variable correction factor is calculated for each pixel using a first product of a first constant factor, describing the geometry and guality of the lens/sensor system, multiplied with the square of the distance between the pixel and the center of the sensor array, and a second product of a second constant, describing the geometry of the lens/sensor system with the distance between the pixel and the center of the sensor array to the power of four.
A method to compensate vignetting in digital cameras comprising a multiplication of each pixel output of the array sensor of the camera, except pixels being close to the center, with a variable correction factor defined for said pixels, wherein said variable correction factor is calculated for each pixel, except pixels being close to the center of the sensor array, using a first product of a first constant factor, describing the geometry and quality of the lens/sensor system, multiplied with the square of the distance between the pixel and the center of the sensor array, and a second product of a second constant, describing the geometry of the lens/sensor system with the distance between the pixel and the center of the sensor array to the power of four.
A method to compensate vignetting in digital cameras using a correction factor for pixel output of its sensor array wherein the required computation comprises the following steps:
A method to compensate vignetting in digital cameras using a correction factor for pixel output of its sensor array wherein the required computation comprises the following steps:
Dependencies are inferred from the claim text.