© 2002 by Yu Hen Hu 1 ECE533 Digital Image Processing Image Acquisition

Image Acquisition

Electromagnetic Spectrum

The wavelength required to “see” an object must be the same size or smaller than the object

Image Sensors

Sensor Strips

Chapter 2: Digital Image FundamentalsChapter 2: Digital Image Fundamentals

Digital Image Representation

An image is a function defined on a 2D coordinate f(x,y).

The value of f(x,y) is the intensity.

3 such functions can be defined for a color image, each represents one color component

A digital image can be represented as a matrix.

Spatial and Gray Level Resolution

Spatial resolution: » # of samples per unit

length or area» DPI: dots per inch

specifies the size of an individual pixel

» If pixel size is kept constant, the size of an image will affect spatial resolution

Gray level resolution:» Number of bits per

pixel» Usually 8 bits» Color image has 3

image planes to yield 8 x 3 = 24 bits/pixel

» Too few levels may cause false contour

Same Pixel Size, different Sizes

Same Size, Different Pixel Sizes

Varying Gray Level Resolution

Size, Quantization Levels and Details

Isopreference curves

Aliasing: Moiré Effect

Zooming Zooming

Zooming and Interpolation

© 2002 by Yu Hen Hu 1 ECE533 Digital Image Processing Image Acquisition

Documents

Christopher Parrish ECE533 Project December 2006

Hen Newspaper

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