Max pixel value on satellite image

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Emre
Emre 2014-4-2
评论： Image Analyst 2014-4-2
I have DailyET.tif map and I want to find max pixel value and pixel location (x,y)....
When I try it
a=imread('DailyET.tif');
than I open "A" at workspace I see pixel value but not have all pixels.(only have 7251*8091 single value)
how can I open image with all pixel information???

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回答（1 个）

Image Analyst
Image Analyst 2014-4-2
You can use the zoom() function. Set up a scroll bar to set different zoom factors.
To find the max value and location(s):
maxGrayLevel = max(grayImage(:));
[rowsMax, columnsMax] = find(grayImage == maxGrayLevel);
  2 个评论
Image Analyst
Image Analyst 2014-4-2
编辑：Image Analyst 2014-4-2
Emre's "Answer" moved here:
when I try this code Matlab give me to error Undefined variable grayImage.
how can I use this code ???
maxGrayLevel = max(grayImage(:));
[rowsMax, columnsMax] = find(grayImage == maxGrayLevel);
Image Analyst
Image Analyst 2014-4-2
Well, you have to replace grayImage with the name of your image variable. Here's an example:
fullFileName = 'cameraman.tif';
grayImage = imread(fullFileName);
maxGrayLevel = max(grayImage(:))
[rowsMax, columnsMax] = find(grayImage == maxGrayLevel)
Of course you chose the very poor name of a so your code would look like this:
fullFileName = 'cameraman.tif';
a = imread(fullFileName);
maxGrayLevel = max(a(:))
[rowsMax, columnsMax] = find(a == maxGrayLevel)
I recommend that you use descriptive variable names and don't have your code look like an alphabet soup of random single letter variables.

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