Patent ID: 8854223

Claim:
A method for image-based determination of concentration of CO and CO 2 in a vehicle's exhaust gas, the method comprising: receiving at least one IR image of an exhaust plume of a motor vehicle, said IR image having been captured using a mid-wave infrared camera having at least one optical filter tuned to the infrared absorption band of any of: CO and CO 2 , said IR image comprising an array of pixels with intensity values obtained at said absorption band, and said IR image comprising at least a region of pixels in said array of pixels representing the exhaust plume and a reference region of pixels in said array of pixels representing a reference surface comprising a known radiance with a known temperature and emissivity; isolating said region of pixels representing said exhaust plume; isolating said reference region of pixels representing said reference surface; normalizing intensity values of pixels in said isolated region by a value of said known radiance of said reference surface; and determining, based on said normalizing, a concentration of any of CO and CO 2 in said exhaust plume using a calibration curve which relates pixel intensities to concentration levels.