Implementing Feature Extraction to Create Database

We have a project regarding the use of image processing in rice plant. This question is related to my first question here. I want to ask how can I use feature extraction to extract the shape and color of a plant and then create a database from it. Also, we'll also use the backpropagation algorithm to train our system but we don't know how to implement it.

I hope you'll be able to help me. Thank you! :)

Answer 1

[Image Analyst]

You can measure a bunch of things such as size, color, etc. See my tutorials and demos in my File Exchange for examples: Image Analysis Demos and Tutorials. I don't have the NN toolbox so you'll have to wait for Greg Heath or someone else for help with your NN question.

[Elvin]

Thank you for that. How about storing the features in the database so that I could use it as the standard when comparing the features of the test images?

[Image Analyst]

The simplest method is to just use save() to store your variables, and load() to recall them.

[Elvin]

Will the save() and load() function enough the creation of database and the extraction of information from the created database?

[Image Analyst]

load() brings back variables. If you want to query the variable to see what part of it matches some other image, then you'll need to search that variable for what you're looking for. It's not a full blown SQL server kind of thing where you can issue a query and have it retrieve just matching items, though there is a Database Toolbox if you want that extra functionality.

[Greg Heath]

NN classifiers are based on N examples of pairs of I-dimensional input data vectors and the corresponding O-dimensional target output vectors. The O-dimensional target vectors are unit column vectors with a 1 in the row corresponding to the class index.

So, to begin, form the input and corresponding target matrices with dimensions

[ I N ] = size(input)

[ O N ] = size(target)

Then see the documentation and examples for patternnet.

doc patternnet

help patternnet

Finally check NEWSGROUP and ANSWERS for posts using the searchword

patternnet.

Hope this helps.

Greg

[primrose khaleed]

how can used sift to extraction features of my project....my peoject is under vehical scanner which looking for the forgine objects in under vehical ....pleas help me...how to khnow what is the namber of hidden layer can help me....how to feed the neural network by extraction features...

i wnat create database of image and i want to enter this image into NN..my asking which image saving in database ?? the original images or after fuature extraction??