Image synthesizing method for forming a composite image from basic images
AssigneeU.S. Philips Corporation
InventorKai-Michael Ludeke
Life of this patent
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Abstract
An image synthesizing method and apparatus for forming a composite image from basic images with complex image values acquired by sensors having sensitivities which vary differently across the area to be imaged, includes the deviation of complex image values of the composite image from the image values of the basic images which have been weighted in dependence on the complex values of the sensitivity of the sensors. The complex sensitivity values are determined according to the invention in that the sensitivities of the sensors are estimated on the basis of the basic images themselves by determining the sensitivity of each sensor from the basic image acquired thereby.
Claims17
An image synthesizing method for forming a composite image from a plurality of basic images, each of which is acquired by means of a respective sensor having a sensitivity which varies across the area to be imaged, the image values of the composite image being derived from the image values of the the plurality of basic images, weighted in dependence on the sensitivity, characterized in that the spatial variation of the absolute value of the sensitivity of each sensor is derived from the basic image acquired thereby.
An image synthesizing method for forming a composite image from one or more basic images, each of which is acquired by means of a respective sensor having a sensitivity which varies across the area to be imaged, the image values of the composite image being derived from the image values of the basic image, or basic images, weighted in dependence on the sensitivity, wherein the spatial variation of the absolute value of the sensitivity of each sensor is derived from the basic image acquired thereby by a method in which a smooth enveloping surface of locally smaller curvature is constructed for each basic image on that basic image, which enveloping surface is based on the locally highest image values and includes all locally lower image values, the spatial variation of the absolute value of the sensitivity of the sensor associated with the relevant basic image being derived from the values on the enveloping surface.
An image synthesizing method for forming a composite image from one or more basic images, each of which is acquired by means of a respective sensor having a sensitivity which varies across the area to be imaged, the image values of the composite image being derived from the image values of the basic image, or basic images, weighted in dependence on the sensitivity, wherein the spatial variation of the absolute value of the sensitivity of each sensor is derived from the basic image acquired thereby by a method in which the spatial variation of the absolute value of the sensitivity of each sensor is determined by means of a rational approximation function (F.sub.i,jk) whose coefficients are derived from the basic image of this sensor in such a manner that they approximate the spatial variation of the image values of the basic image.
An image synthesizing method for forming a composite image from one or more basic images, each of which is acquired by means of a respective sensor having a sensitivity which varies across the area to be imaged, the image values of the composite image being derived from the complex image values of the basic image, or basic images, weighted in dependence on the complex values of the sensitivity, wherein the spatial variation of the absolute value of the sensitivity of each sensor is derived from the basic image acquired thereby and wherein
- the spatial variation of the phase of the sensitivity of each sensor is derived from the low-pass filtered complex basic image for the associated sensor, and
- the complex value for the sensitivity of each sensor is derived from the absolute value and the phase of the sensitivity of the individual sensors.
Dependencies are inferred from the claim text.