Image Restoration/Introduction

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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.

Contents 1 Ex. of Image Enhancment 2 Ex. of Image Restoration 3 Selecting a suitable image 4 Image types 4.1 Obsolete photography methods 4.2 More rarely-seen art 5 Graphics information

[edit] Ex. of Image Enhancment

• Image Sharpening

[edit] 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.

[edit] 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

[edit] Image types

• Pencil sketch
• Pen and ink
• Paintings
• Engravings
• Lithographs
• Photography

[edit] Obsolete photography methods

• Daguerrotype
• Salt paper
• Colloidon glass
• Photochrom
• Sheet Kodachrome

[edit] More rarely-seen art

• Chalk
• Coloured pencils
• Pastels
• Etc.

[edit] Graphics information

• Raster v. vector graphics