extract intensity pixels

Question

Tulips 2012-5-28

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https://ww2.mathworks.cn/matlabcentral/answers/39595-extract-intensity-pixels

hi sir, can I know how to make/feed the input of extracted intensity pixels in neural network.as far as I am concerned, the extracted pixels are in row,column.then how to make it as input if I have more 6 patterns. pls explain the techniques.thanks for ur help!

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Tulips 2012-5-28

also how to make it as a feature vector so that I can used it in nn script

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Answer 1

Walter Roberson 2012-5-28

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https://ww2.mathworks.cn/matlabcentral/answers/39595-extract-intensity-pixels#answer_49238

在 MATLAB Online 中打开

extracted_pixels = YourArray( sub2ind( size(YourArray), RowList, ColumnList ) );

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Walter Roberson 2012-5-28

It does not have to be in matrix form, but you did say the pixels were in row, column form which does tend to imply matrix form, as otherwise you would only have one index.

The above code works for multiple indices. Example,

extracted_pixels = YourArray( sub2ind( size(YourArray), [2 7 8], [1 1 4] ) )

would extract (2,1) and (7,1) and (8,4)

Tulips 2012-5-30

sir,I get u have said.However, i m not looking for the extracted pixel.i just want to know how to make the 20x20 pixels as a input of a vector so that this input can be used to be trained in neural network.thanks

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