Digital Image Processing SANDHIYA. LOGISTICS OF THE COURSE n Duration –20-22 lectures n Assessment –100% exam –There isn't any coursework or homework.

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Presentation transcript:

Digital Image Processing SANDHIYA

LOGISTICS OF THE COURSE n Duration –20-22 lectures n Assessment –100% exam –There isn't any coursework or homework

IMAGE PROCESSING  Textbook – R. C. Gonzalez, R. E. Woods, Digital Image Processing, Addison Wesley, 1993, ISBN – R. C. Gonzalez, R. E. Woods, Digital Image Processing, Addison Wesley, 1993, ISBN

DIGITAL IMAGE

FROM ANALOG TO DIGITAL Record output Display objectobserve Imaging systems digitize Sample and quantize store Digital storage (disk) process Digital computer Refresh /store On-line buffer

SamplingSampling 256x256 64x64

Quantisation – 8 bits

Quantisation cont. 256x levels 256x levels

Quantisation cont. 256x levels 256x256 2 levels

Coloured Image

Intensity (Gray-Level) Image

Binary Image

Image Processing  manipulation of multidimensional signals image (photo) video video CT, MRI CT, MRI

Image Processing  Why? – Coding/compression – Coding/compression – Enhancement, restoration, reconstruction – Enhancement, restoration, reconstruction – Analysis, detection, recognition, understanding – Analysis, detection, recognition, understanding – Visualization – Visualization

Original Image Fourier Transform Amplitude Phase Part I: Image Transforms

Original Image High Pass Filtering Part II: Image Enhancement

Distorted ImageRestored Image Part III: Image Restoration

Distortion due to Camera Misfocus Original imageDistorted image

Distortion due to Camera Misfocus Camera lens

Distortion due to motion Camera lens

Distortion due to Random Noise Distorted imageOriginal image

Part IV: Image Compression  Signal-Processing Based: Encoder Encoder H Compressed Representation Decoder

Images are not directly amenable to computer analysis n Computers work with numerical (rather than pictorial) data. n An image must be converted to numerical form before processing by computer can commence. n Picture elements or pixels n Rectangular sampling grid n Brightness of the image

Images are not directly amenable to computer analysis

n Medical images n Satellite images n Astronomy n Radar images APPLICATIONS

Satellite image Volcano Kamchatka Peninsula, Russia

Satellite image Volcano in Alaska

Medical Images: MRI of normal brain

Medical Images: X-ray knee

Medical Images: Ultrasound Five-month Foetus (lungs, liver and bowel)

Astronomical images

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