Adaptive PSF Estimation Technique Using a Sharp Preview and a Blurred Image

A method of adaptive motion estimation and deblurring of acquired digital images, comprising:

• acquiring multiple digital images with a moving digital image acquisition device that includes an image sensor, including a relatively sharp, underexposed reference image and a blurred image;
• estimating an initial approximate point spread function (PSF) based on a first DC offset point corresponding to the moving of the device during the acquiring of the multiple digital images;
• choosing multiple crops from the blurred image and the reference image or an interpolated version of the reference image, or both, and equalizing a brightness between these crops;
• computing a second PSF for a pair of horizontal and vertical offsets;
• calculating a Cepstrum and refining the second PSF to generate a third PSF based on the Cepstrum;
• precisely determining a position of a first PSF point;
• and
• deblurring at least one of the digital images using a best found PSF based on the third PSF and first PSF point.

One or more non-transitory computer readable media having code embedded therein for programming one or more processors to perform a method of adaptive motion estimation and deblurring of acquired digital images, wherein the method comprises:

• acquiring multiple digital images with a moving digital image acquisition device that includes an image sensor, including a relatively sharp, underexposed reference image and a blurred image;
• estimating an initial approximate point spread function (PSF) based on a first DC offset point corresponding to the moving of the device during the acquiring of the multiple digital images;
• choosing multiple crops from the blurred image and the reference image or an interpolated version of the reference image, or both, and equalizing a brightness between these crops;
• computing a second PSF for a pair of horizontal and vertical offsets;
• calculating a Cepstrum and refining the second PSF to generate a third PSF based on the Cepstrum;
• precisely determining a position of a first PSF point;
• and
• deblurring at least one of the digital images using a best found PSF based on the third PSF and first PSF point.

A digital image acquisition device, comprising:

• a lens and an image sensor for acquiring a digital image;
• a processor;
• and
• one or more processor-readable media having code embedded therein for programming the processor to perform a method of adaptive motion estimation and deblurring of acquired digital images, wherein the method comprises:
• acquiring multiple digital images with a moving digital image acquisition device that includes an image sensor, including a relatively sharp, underexposed reference image and a blurred image;
• estimating an initial approximate point spread function (PSF) based on a first DC offset point corresponding to the moving of the device during the acquiring of the multiple digital images;
• choosing multiple crops from the blurred image and the reference image or an interpolated version of the reference image, or both, and equalizing a brightness between these crops;
• computing a second PSF for a pair of horizontal and vertical offsets;
• calculating a Cepstrum and refining the second PSF to generate a third PSF based on the Cepstrum;
• precisely determining a position of a first PSF point;
• and
• deblurring at least one of the digital images using a best found PSF based on the third PSF and first PSF point.