Image Restoration/Introduction

Image Restoration is the recovery of an original image x[m,n] from a given degraded image y[m,n] with a priori/posteriori knowledge of the degradation process. Image Restoration is not the same as Image Enhancement. Ex. of Image Enhancment Image Sharpening Image editing Ex. of Image Restoration Correcting a blurred Image caused by a moving camera. Image restoration is a set of techniques for restoring historic photographs, sketches, and other archival images in digital format. The primary software used in this module includes Adobe Photoshop CS3 Extended, GIMP, and Paint.NET. Selecting a suitable image High resolution Well composed If scanned, then scanned in high resolution on a clean scanner No .jpg artifacting Damage not too extensive Image types Pencil sketch Pen and ink Paintings Engravings Lithographs Photography Obsolete photography methods Daguerrotype Salt paper Colloidon glass Photochrom Sheet Kodachrome More rarely-seen art Chalk Coloured pencils Pastels Etc. Graphics information Raster v. vector graphics