Method and system for correcting chromatic aberrations of a color image produced by an optical system
A system and a method for correcting chromatic aberrations of a color image composed of a plurality of digitized color planes. The color image is assumed to have been produced by an optical system. According to the system and method, geometric anomalies of the digitized color planes are modeled and corrected, at least partly, in such a way to obtain corrected digitized color planes. The corrected digitized color planes are then combined to obtain a color image corrected completely or partly for the chromatic aberrations. The system and method are applicable to photographic or video image processing, in optical devices, industrial controls, robotics, metrology, etc.
1. A method for correcting chromatic aberrations of a color image composed of a plurality of digitized color planes, the color image having been produced by means of an optical system, the method comprising:
modeling and correcting, at least partly, the geometric anomalies composed of deviations between geometric defects of the digitized color planes, to obtain corrected digitized color planes, wherein it is possible to establish a correspondence between the corrected digitized color planes; and
combining the corrected digitized color planes to obtain a color image corrected completely or partly for the chromatic aberrations,
wherein the step of modeling and correcting further comprises:
producing, by means of an appliance or an appliance chain, an image of a reference scene, the image exhibiting defects,
producing, from the reference scene, a virtual reference,
establishing a bijection between the image and the virtual reference,
calculating projections of the virtual reference onto three digitized color planes R, G and B, using a same mathematical projection for each of the three digitized color planes,
calculating formatted information comprising mathematical projections, and
correcting the chromatic aberrations of the image based on the formatted information.
2. A method for correcting the distortion defects of a color image composed of a plurality of digitized color planes, the color image having been produced by means of an optical system and configured to correct distortion defects of the color image, the method comprising:
modeling and correcting, at least partly, the geometric anomalies composed of distortion defects of the digitized color planes, to obtain corrected digitized color planes, wherein it is possible to establish a correspondence between the corrected digitized color planes; and
combining the corrected digitized color planes to obtain a color image corrected completely or partly the distortion defects,
wherein the step of modeling and correcting further comprises:
producing, by means of an appliance or an appliance chain, an image of a reference scene, the image exhibiting defects,
producing, from the reference scene, a virtual reference,
establishing a bijection between the image and the virtual reference,
calculating projections of the virtual reference onto three digitized color planes R, G and B, using a same mathematical projection for each of the three digitized color planes,
calculating formatted information comprising mathematical projections, and
correcting the distortion defects of the image based on the formatted information.
3. A system for correcting chromatic aberrations of a color image composed of a plurality of digitized color planes, the color image having been produced by an optical system;
the system comprising:
first calculating means for modeling and correcting geometric anomalies of the digitized color planes, to obtain corrected digitized color planes; and
second calculation means for combining the corrected digitized color planes, to obtain a color image corrected completely or partly for the chromatic aberrations,
wherein the first calculating means for modeling and correcting geometric anomalies further comprises:
first producing means for producing, by means of an appliance or an appliance chain, an image of a reference scene, the image exhibiting defects,
second producing means for producing, from the reference scene, a virtual reference,
establishing means for establishing a bijection between the image and the virtual reference,
third calculating means for calculating projections of the virtual reference onto three digitized color planes R, G and B, using a same mathematical projection for each of the three digitized color planes,
fourth calculating means for calculating formatted information comprising mathematical projections, and
correcting means for correcting the distortion defects of the image based on the formatted information.
4. A system according to claim 3 , wherein:
the first calculating means further for modeling and correcting, at least partly, the geometric anomalies composed of deviations between geometric defects of the digitized color planes to obtain corrected digitized color planes, wherein it is possible to establish a correspondence between the corrected digitized color planes; and
the second calculating means further for combining the corrected digitized color planes to obtain a color image corrected completely or partly for the chromatic aberrations.
5. A system according to claim 3 , configured to correct chromatic aberrations and distortion defects of the color image, the system further comprising:
first calculating means further for modeling and correcting, at least partly, the geometric anomalies composed of distortion defects of the digitized color planes to obtain corrected digitized color planes, wherein it is possible to establish a correspondence between the corrected digitized color planes; and
second calculating means further for combining the corrected digitized color planes to obtain a color image corrected completely or partly for the chromatic aberrations and the distortion defects.