Is that possible to get data from the red trace in this BMP file

[detech]

I have an instrument, which only export image file. I want use labview to replot it and do some analysis. The image file is like attachment. Is that possible to get data from the red  trace in this BMP file via labview vis?

[zou]

There is an application called Data Thief, which does want you want.   Just search google.

If you want  a pure G solution, download Picture to Data.vi (http://www.geocities.com/gzou999/demo.htm), which demonstrates how to do this programmtically in LabVIEW.

George Zou

http://gtoolbox.yeah.net

[rpursley8]

Try this function.  It breaks the picture up into RGB and used the R and G channels to pull out the plot line.  All you will have to do is scale the resulting values.

[rpursley8]

Here is a bmp of the program in case you cannot read a LabVIEW 7.1.1 file

[rpursley8]

Here is the result I got.

[detech]

This is great vi. I like it. Only thing is the X -axis coordinate, which is important, I do not care Y-axis coordinate. It seems the Vi did not pick x-axis value from image. If that can be done, I get the solution. 

[detech]

I went there. It needs payment to get Vi or use Vi.

I do not know this is one time paymeny or just for a period time.

[rpursley8]

I looks to me that 515 pixels represents 200 meters, so multiply the x-values by 0.3885 meters/pixel to get the true x-values.  I don't have enough information to scale the y-axis.

[detech]

Y-axis coordinate doe not matter so far.

You say 515 pixels resprents 200 meter. You got it just by looking at picture or what you did ?? 

It seems color is important. I have a picyute with blue trace, it wonld not work. Red is Ok, I just want to know if it has to be red

[zou]

No. you don't.  You can download Picture to Data.vi free.

Picture to Data.vi has diagarm.  It mean to demonstrate how to convert curve in picture to data.

George Zou

http://gtoolbox.yeah.net