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