Method for producing a digital image, associated computer program product and optical system

An optical system, comprising,

• a processing unit, a non-transitory computer-readable medium and a program memory coupled to the processing unit and having program instructions stored thereon which, when executed by the processing unit, cause the processing unit to produce a digital image;
• a hollow body, comprising,
• an objective lens to collect a set of incoming light beams from a study scene corresponding to a portion of a ceiling structure;
• a matrix sensor cooperating with the processing unit and having an active face, to capture all or some of said incoming light beams, said matrix sensor producing a digital representation of the study scene,
• a data memory for recording information associated with a determined pattern comprising an item of metainformation characterizing said pattern;
• and
• wherein the processing unit is arranged to produce the digital image from an electronic transformation of the digital representation, and
• the processing unit further cooperates with the program memory comprising program instructions which, when executed by the processing unit,
• analyze said digital representation and detect the presence of a characteristic pattern;
• search in the data memory for a recording associated with a determined pattern close to said detected characteristic pattern;
• extract the value of the associated metainformation from such a recording;
• and
• trigger the acquisition of several successive digital representations by the matrix sensor;
• produce one single digital representation from said successive digital representations,
• and
• wherein the processing unit cooperates with a program memory comprising program instructions, which, when executed by the processing unit, reduce noise and/or improve intensity and contrast of the digital representation in order to improve quality of the digital image.