Next: Deconvolution Up: Where Have We Been Previous: Introduction . I heard the following statements about Image Restoration. Some of these were made by one person more or less in the words I put down here, and some were recurrent themes in the meeting. ... Many forms of deconvolution algorithm are too mysterious. ... It's impossible. ... What's impossible? Evidently, to find a solution to the convolution equation when the PSF is singular. ... It's too hard. ( many people ) . ...