Accomplishing a number of mobile development projects our experts were getting more and more interested in video and image processing techniques. As a part of our internal Research/Modeling projects Abto Software specialists are now involved in the research of various image restoration methods used in digital image processing applications.

original degraded image obtained from cell phone, degradation type: out-of-focus blur The result of applying the proposed restoration methodWhen dealing with naturally degraded images (as opposed to artificially degraded ones), we came to the conclusion that in general it is impossible to reliably obtain good results using only simple restoration methods such as the inverse filtering or Wiener deconvolution. These methods won’t work even in the most common cases where image blurring process can be described as its convolution with some blur kernels. In practice restoration of degraded image requires applying iterative blind deconvolution technique. To achieve even better results and decrease the processing artifacts, we use total variation minimization scheme.

Other methods of image restoration investigated by our engineers include the use of genetic algorithms and other methods of stochastic optimization. Apart from image deconvolution we are also conducting the research on Super Resolution method, which is used in our other project.

To get to know more about different techniques that we use in projects that delve into Digital Image Processing area, please view our articles “Introduction to Image Restoration Methods” posted in Abto Software Blog. There we describe general Image Restoration approaches, Convolution, Deconvolution, Inverse Filtering and Wiener filtering and some other topics regarding image restoration.

original out-of-focus image obtained by camera

1. original out-of-focus image obtained by camera

standard Wiener restoration result

2. standard Wiener restoration result

standard iterative (Richardson-Lucy) restoration result

3. standard iterative (Richardson-Lucy) restoration result

proposed restoration method result

4. proposed restoration method result

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