data processing – ch 11 – reesdata processing – ch 11 – rees transmission and storage of...

Data Processing – CH 11 – Rees

transmission and storage of data image processing

preprocessing radiometric correction geometric correction image enhancement contrast modification spatial filtering band transformation vegetation index principal component analysis

image classification

© Cambridge University Press 2011

satellite receiving station mask


contrast modification


linear contrast stretch


histogram equalization


smoothing or low-pass filter (boxcar)


sharpening or high-pass filter


Laplacian filter


Sobel or derivative filter

convolution theorem

matlab demo


filtering in fourier transform domain

Facial recognition breakthrough: 'Deep Dense' software spots faces in images even if they're partially hidden or UPSIDE DOWN • Algorithm was built by Yahoo Labs in California and Stanford University

• It built on Viola-Jones algorithm which spots front-facing images of people

• Researchers used a form of machine learning known as a deep convolutional neural network

• This involves training a computer to spot features in a database of images

• The algorithm can identify faces from various angles, when part of the face is hidden and even upside down

• It doesn't recognise who a face belongs to, but could be trained to do so

• Facebook and Google use similar networks to improve image recognition http://www.dailymail.co.uk/

The Deep Dense Face Detector algorithm was built by Yahoo Labs in California and Stanford University. The researchers used a form of machine learning known as a deep convolutional neural network to train a computer to spot facial features (pictured) in a database of images.


median filter


normalized difference vegetation index (NDVI)

– red .64 µm – near IR .8 µm

NDVI = ri − rrri + rr

ri

rr

Reflectance of green-leafed vegetation is low in the red part of the spectrum because of absorption by chlorophyll and high in the near infrared.

principal component analysis matlab demo

principal component analysis

matlab demo

Data Processing – CH 11 – Rees

transmission and storage of data image processing

preprocessing radiometric correction geometric correction image enhancement contrast modification spatial filtering band transformation vegetation index principal component analysis

image classification

data processing – ch 11 – reesdata processing – ch 11 – rees transmission and storage of...

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