Lecture 18 Figures from Gonzalez and Woods, Digital Image Processing, Second Edition, 2002.

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Presentation transcript:

Lecture 18 Figures from Gonzalez and Woods, Digital Image Processing, Second Edition, 2002.

Image Compression Images contain lots of redundancy, so compression is important in Teleconferencing Remote sensing Document and medical imaging FAX transmissions Anything that requires the transmission of an image requires a compression scheme

Image Compression (2) Two types Information preserving—used in medical applications Lossy—used in TV, FAX transmission,etc. Types of redundancy Coding redundancy Interpixel redundancy Psychovisual redundancy

Image Compression (3)

Coding Redundancy

Chapter 8 Image Compression

Chapter 8 Image Compression

Interpixel Redundancy

Chapter 8 Image Compression

Interpixel Redundancy

Chapter 8 Image Compression

Psychovisual Redundancy The eye does not respond equally to all visual information. Information of less relative importance is psychovisually redundant.

Chapter 8 Image Compression

Chapter 8 Image Compression

Fidelity Measures RMS error and signal to noise ratio; quantifiable Eyeball norms…Television rating scale

Chapter 8 Image Compression

Chapter 8 Image Compression

Chapter 8 Image Compression

Coding and Decoding Hamming distance Hamming code Parity corrections