Patent ID: 8411924

Claim:
A method for image processing, the method comprising: providing a sequence of images having contrast modulations along said sequence; extracting for each pixel of the sequence of images a first reference frequency related to said contrast modulations along said sequence, the first reference frequency being a harmonic frequency of said contrast modulations; and filtering each pixel of said sequence of images depending on said first reference frequency by extracting a harmonic frequency component from the sequence of pixels at the first reference frequency, thereby providing a modified sequence; extracting for each pixel of the sequence of images a second reference frequency being a higher harmonic frequency of the contrast modulations along the sequence; filtering each pixel of the modified sequence of images by extracting a higher harmonic frequency component from the modified sequence of pixels at the second reference frequency, thereby providing an output sequence of images, and providing at least one of an in-phase component of the of the output images and an out-of-phase component of the output images; and displaying the output sequence of images as a color coded or grey coded image; and wherein the first and second reference frequencies deviate from the respective harmonic frequencies by up to 30%; and wherein the extracting and filtering steps above are performed via a processor.