Issues in Digital Image Acquisition

Digital Image Acquisition

scannervideo digitizerdigital cameradigital video

devices

line scan sensorsarea sensors

sensor organization

Digital Image Representation

X

Y

origin

f(x,y)

Monochrome image - a two-dimensional light intensity function f(x,y)

• Spatial Resolution

• Brightness Quantization

Spatial Resolution

256x256 128x128 64x64

Spatial Resolution

256x256 128x128 64x64

32x32 16x16

Brightness Quantization

G=256 G=64 G=16

G=8 G=4 G=2

Benchmark Images

Benchmark Images

Benchmark Images

Benchmark Images

Digital Representations

Digital Representations

Binary image1 bit/pixel

Digital Representations

Greyscale8 bits/pixel

Digital Representations

True color24 bits/pixel

Digital Representations

True color - 24 bits/pixel

Red channel8 bits/pixel

Green channel8 bits/pixel

Blue channel8 bits/pixel

Digital Representations

Pseudocolor8 bits/pixel + look-up table (LUT)