Correction of a halo in a digital image and device for implementing said correction

A method for correcting a halo in a digital image to be corrected of a scene captured in a three-dimensional modeling studio using photogrammetry by means of a shooting device having a shooting field of the scene, this halo being generated through an interaction of light emitted by a light source with an optic of the shooting device, and manifesting as a lightening of pixels of the digital image to be corrected, said light source forming part of a lighting system of the scene, comprising:

• generating a digital light intensity map characterizing said light source in terms of spatial distribution relative to the shooting field and in terms of light intensity as it is perceived from the shooting device during the capture of the image to be corrected, this map forming a first data matrix;
• providing a convolution kernel specific to said shooting device, forming a second data matrix;
• calculating a convolution product of the first data matrix and the second data matrix to obtain a third data matrix corresponding to a corrective value map of the halo in the digital image to be corrected;
• and
• removing the corrective value map from the digital image to be corrected pixel by pixel to obtain a corrected image in which the halo is not present;
• wherein the step of generating the digital light intensity map comprises:
• generating a preliminary digital light intensity map characterizing said light source in terms of spatial distribution relative to the shooting field and in terms of light intensity as it is perceived from the shooting device when said light source is fully visible to the shooting device;
• and
• generating said digital light intensity map from the preliminary digital map and the digital image to be corrected, by determining pixels belonging to said light source in the preliminary digital map that are hidden from the shooting device in the digital image to be corrected.