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How to calculate SNR( Signal to Noise Ratio) for selected Area in the Image?

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This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.

#1 Posted : Friday, May 9, 2008 3:23:03 AM(UTC)

Gunasekaran

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Posts: 53

Hello
How to calculate SNR( Signal to Noise Ratio) for selected Area in the Image?

Thanks and Regards
Guna


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#2 Posted : Sunday, May 11, 2008 7:37:15 AM(UTC)

Adam Boulad

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Guna,

This depends on the definition of 'signal' and 'noise'
in the area concerned. Unless you have a clean, noise-free copy of the image,
or of the noise pattern inside it, you cannot calculate SNR solely based on
image pixel data alone. Suppose you have a white pixel in the middle of black
pixels, how do you know for sure that this pixel is noise and not actually white in the original image itself?

#3 Posted : Sunday, May 11, 2008 10:25:54 PM(UTC)

Gunasekaran

Groups: Registered
Posts: 53

Hello Ji..

I have attached the SNR.jpg file in that file i rounded the two vales (1.median single line mean,2.median single line standerd deviation)i don't know how will be calculated based on size,min,max,median and mean. can u check and reply me....

Thanks in Advance
Guna

#4 Posted : Monday, May 12, 2008 5:16:12 AM(UTC)

Adam Boulad

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Guna,

Your attachment was not uploaded correctly. However,
there is no need to upload your attachment. As I told you earlier, you cannot
calculate the value of the SNR unless you have a clean, noise-free copy of the image, or of the noise pattern inside it.

#5 Posted : Tuesday, May 20, 2008 7:48:34 PM(UTC)

Gunasekaran

Groups: Registered
Posts: 53

hi dude

i am using lead tools version 15.0... i am working VB.net using medical viwer demo project.. i need answer for the following question. all qustion based on above configration

1.can u send sample code for calculating mean,median,stddev,min,max for selected area in the gray image(single channel) or any sample project available in the leadtools.

2.how can i print preview the image with annotation like text and rectangle(i can get the result in raster image viwer but i can't get using medical viwer control).

3.How can i measure the line length, rectangle area ans so on using medical viwer control?

4. How can i remove the cross hair style in the magnify glass in runtime(wat code i have to write in the funtion when i click the magnify glass tool button)

Thanks and Regards

Guna

#6 Posted : Wednesday, May 21, 2008 4:37:50 AM(UTC)

Adam Boulad

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Posts: 3,022

Was thanked: 2 time(s) in 2 post(s)

About
the first question, you can use the MinMaxValuesCommand Class to get the minimum and maximum values of intensity.

You can use the Histogram to check the Median and Mean values of the image.

Please
check our main demos which use the Histogram and calculate the Mean and Median values.

About
the other questions, please create a new post for each one, since they are different issues.

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