Patent ID: 8081847

Claim:
A method for up-scaling an input image represented by an input video signal in an image up-scaling system, the method comprising steps of: receiving and processing the input video signal in an up-scaling device ( 21 , 23 ), wherein the step of receiving and processing the input video signal in the up-scaling device ( 21 , 23 ) comprises steps of: generating a first up-scaled video signal from the input video signal by up-scaling the input video signal by a rational factor of L/M, wherein L is an interpolation factor used for an interpolation of the input video signal in an interpolation element in the up-scaling device ( 21 , 23 ), and M is a decimation factor used for a decimation in a decimation element in the up-scaling device ( 21 , 23 ), and providing the first up-scaled video signal to a signal combining device ( 24 ), receiving and processing the input video signal in a harmonics generation device ( 22 , 25 , 26 , . . . , 30 ), wherein the step of receiving and processing the input video signal in the harmonics generating device ( 22 , 25 , 26 , . . . , 30 ) comprises steps of: generating from the input video signal a higher harmonics video output signal representing higher harmonics of the input video signal in a frequency domain, the generating of the higher harmonics video output signal comprising steps of up-scaling the input video signal by a factor of k×(L/M) (k>1) to form a second up-scaled video signal, generating a higher harmonics video signal from the second up-scaled video signal, and decimating the higher harmonics video signal by a decimating factor of k, and providing the higher harmonics video output signal to the signal combining device ( 24 ), in the signal combining device ( 24 ), generating an up-scaled output image represented by an up-scaled output video signal by combing the first up-scaled video signal with the higher harmonics video output signal, and providing the up-scaled output video signal to an output of the combining device ( 24 ).