Implementing Feature Extraction to Create Database

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Elvin 2013-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/87880-implementing-feature-extraction-to-create-database

编辑： primrose khaleed 2014-4-27

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! :)

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Image Analyst 2013-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/87880-implementing-feature-extraction-to-create-database#answer_97491

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.

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Greg Heath 2013-9-25

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 2014-4-27

编辑：primrose khaleed 2014-4-27

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??

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