Patent ID: 7519231

Claim:
A computer-implemented method comprising: accessing, by an image processing device, at least a portion of a digital image; and determining if at least said portion is blurred based on a Cepstrum analysis blur detection process that includes using a point spread function (PSF) that includes a circular averaging filter to blur at least a part of said image, wherein said PSF is used to blur a plurality of parts I ij to produce corresponding blurred images BI ij , where BI ij =real( FFT −1 ( FFT ( I ij )* FFT ( PSF ))) where FFT stands for Fast Fourier Transform and wherein the Cepstrum analysis includes the steps of: dividing the image into portions; calculating the Cepstrum of each portion; binarizing each result; calculating an elongation of each binary Cepstrum image; and determining blur existence or type.