How to analyze the data from a graph saved as a .png image?

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Miguel Capelo 2020-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/583793-how-to-analyze-the-data-from-a-graph-saved-as-a-png-image

评论： Miguel Capelo 2020-8-25

CurvaCaracteristica da Turbina Kaplan (1).png

Hey!

I have this .png image of some graphs and I want to store the data of all the info found in this type of graph (turbine graphs), in different vectors. Can anyone help?

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Miguel Capelo 2020-8-24

For instante, in this case identify the best efficiency point and its efficiency (94.12), and the Q, H and Power for that point (6.45 m3/s, 24.05m and aprox. 1.4MW)

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KSSV 2020-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/583793-how-to-analyze-the-data-from-a-graph-saved-as-a-png-image#answer_484325

Try this file form file exchange: https://www.mathworks.com/matlabcentral/fileexchange/7173-grabit

Note that it is a tedious job and it is on our patience.

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Miguel Capelo 2020-8-25

I've already seen that, but with Grabit you have to do it yourself for every image (calibrate the axes, etc). Isn't there any code to do that automatically?

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