I want to meaning of this code, I do not understand

IA = im2uint16(mat2gray(A, [Tmin Tmax]));
imwrite(IA,'A.tiff','tiff');

[Konrad]

Dear Muhammad,

I think you should be more specific about what you do not understand.

The used functions im2uint16, mat2gray, imwrite are well documented.

Best, Konrad

[Hiro Yoshino]

what are the problems? Please make it more specific.

[Muhammad Waheed AZAM]

I want to understand what is meaning of im2uint16, then mat2gray then (A, [Tmin Tmax]) then imwrite then (IA,'A.tiff','tiff');,

I want to understand what happen in this code

[KSSV]

You read the documentation. You will get it.

[Muhammad Waheed AZAM]

@KSSV @Konrad @Hiro I read the document but did not understand please help

[Hiro Yoshino]

Again, can you make a point?

Documentatin is well-written - I wonder where you get stuck.

Why don't you interpret each functon one by one?

[Muhammad Waheed AZAM]

(mat2gray(A, [amin amax]) function means convert matrix A into image and amin, amax are the range of matrix A minimum to A maximum I am right?

[Muhammad Waheed AZAM]

@Hiro (mat2gray(A, [amin amax]) function means convert matrix A into image and amin, amax are the range of matrix A minimum to A maximum I am right?

[Muhammad Waheed AZAM]

@Hiro (mat2gray(A, [amin amax]) function means convert matrix A into image and amin, amax are the range of matrix A minimum to A maximum I am right? matrix A mean sheet in the excel file having all column and rows?

[Muhammad Waheed AZAM]

@Hiro A = xlsread('experiment.xlsx','A','A12:XP523');

Tmin = 24;

Tmax = 37;

save('fields','Tmin','Tmax');

IA = im2uint16(mat2gray(A,[Tmin Tmax]));

imwrite(IA,'A.tiff', 'tiff');

This is total program. I have image A and excel file experiment.xlsx. experiment.xlsx have 523 rows and A-XP columns. Now I want to know,

(mat2gray(A, [amin amax]) function means convert matrix A into image and Tmin, Tmax are the range of matrix A minimum to A maximum I am right? matrix A mean sheet in the excel file having all column (A-XP Columss and 523 rows) and rows?

[Hiro Yoshino]

I = mat2gray(A,[amin amax]) converts the matrix A to a grayscale image I that contains values in the range 0 (black) to 1 (white). amin and amax are the values in A that correspond to 0 and 1 in I. Values less than amin are clipped to 0, and values greater than amax are clipped to 1.

Note that this is a copy of the documentation.

matrix A is something like:

A = rand(10)

A = 10×10

0.3652 0.4990 0.3570 0.3250 0.3703 0.5165 0.8567 0.2700 0.1969 0.8427 0.8319 0.2490 0.1477 0.6183 0.9103 0.1187 0.4691 0.8416 0.4145 0.7285 0.9673 0.6516 0.9929 0.3241 0.5617 0.0003 0.2381 0.2597 0.4023 0.5245 0.7304 0.0957 0.9250 0.8422 0.8263 0.2492 0.1015 0.5149 0.2128 0.4669 0.7243 0.7869 0.9687 0.0662 0.1619 0.7467 0.5655 0.8295 0.7168 0.1069 0.3287 0.5197 0.3206 0.4551 0.9049 0.9328 0.7855 0.6742 0.5931 0.6717 0.1940 0.6067 0.9649 0.5605 0.4305 0.7505 0.0101 0.1553 0.7246 0.6485 0.5959 0.5432 0.2770 0.7318 0.3027 0.7476 0.0562 0.5653 0.3915 0.3219 0.7238 0.9491 0.8121 0.3357 0.2622 0.9480 0.2159 0.5600 0.5243 0.5905 0.5313 0.6811 0.4309 0.0528 0.2952 0.7032 0.2883 0.7997 0.1039 0.9802

I = mat2gray(A,[0 1])

I = 10×10

0.3652 0.4990 0.3570 0.3250 0.3703 0.5165 0.8567 0.2700 0.1969 0.8427 0.8319 0.2490 0.1477 0.6183 0.9103 0.1187 0.4691 0.8416 0.4145 0.7285 0.9673 0.6516 0.9929 0.3241 0.5617 0.0003 0.2381 0.2597 0.4023 0.5245 0.7304 0.0957 0.9250 0.8422 0.8263 0.2492 0.1015 0.5149 0.2128 0.4669 0.7243 0.7869 0.9687 0.0662 0.1619 0.7467 0.5655 0.8295 0.7168 0.1069 0.3287 0.5197 0.3206 0.4551 0.9049 0.9328 0.7855 0.6742 0.5931 0.6717 0.1940 0.6067 0.9649 0.5605 0.4305 0.7505 0.0101 0.1553 0.7246 0.6485 0.5959 0.5432 0.2770 0.7318 0.3027 0.7476 0.0562 0.5653 0.3915 0.3219 0.7238 0.9491 0.8121 0.3357 0.2622 0.9480 0.2159 0.5600 0.5243 0.5905 0.5313 0.6811 0.4309 0.0528 0.2952 0.7032 0.2883 0.7997 0.1039 0.9802

If you show this A as an image, it goes ....

imshow(I)

[Muhammad Waheed AZAM]

@hero IA = im2uint16(mat2gray(A, [Tmin Tmax])); in that code now I want to know how im2uint16 implement

Answer 1

[Muhammad Waheed AZAM]

@KSSV @Konrad @Hiro I read the document but did not understand please help

[Muhammad Waheed AZAM]

@hiro mat2gray(A,[0 1])

can you explain this code from the matrix plz

Answer 2

[Siraj]

Hi,

It is my understanding that you want to understand what this code is doing.

As per my understanding, in first line of code the matrix ‘A’ is converted to a grayscale image that contains values in the range 0 (black) to 1 (white). ‘Tmin’ and ‘Tmax ’ are the values in A that correspond to 0 and 1 in image matrix. Values less than ‘Tmin’ are clipped to 0, and values greater than ‘Tmax’ are clipped to 1.

After this ‘im2uint16’ will convert the image matrix to a 16-bit unsigned integer, rescaling and offsetting the image matrix.

The second line of the code will write the matrix ‘IA’ to a graphics file ‘A.tiff’, the third argument to the function ‘imwrite’ that is ‘tiff’ makes sure that the format of the file is .tiff no matter what extension you give in the file name.

Please refer to mat2gray, im2uint16 and imwrite documentation for more information about these functions.

Hope it helps!