Percentage increase and decrease from two matrices

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Joydeb Saha
Joydeb Saha 2022-12-22
回答： Image Analyst 2022-12-22
Attaching two matrices A1 and B1. I want to calculate the percentage increase and decrease
deltaSignal = (B1 - A1);
percentageDifference = deltaSignal ./ A1;
A1 from B1. Total percentage increase and the total percentage decrease. I have done some part which I am writing here.
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Joydeb Saha
Joydeb Saha 2022-12-22
Ok, let me explain more clearly. See the attached image of Ice. When I make the plot for D = B1 - A1, I have this image, where you may see that there are some blue pixels, these are the positive values (Indicates the ice increase). i want to have the percentage of increase of ice (blue pixels).
Jan
Jan 2022-12-22
@Joydeb Saha: How do you define "the percentage of increase of ice" mathematically? The image does not clarify this.
A mathematical definition of "percentage" means: A number of X divided by a number of Y times 100. So what are your X and Y for "total percentage increase and the total percentage decrease".

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回答（1 个）

Image Analyst
Image Analyst 2022-12-22
You need to convert the image from RGB values to values on the color bar. See attached demo where I did that for a thermal image.

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