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understanding image data

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Posts: 21

understanding image data

Need help in understanding how the data is transcribed here from image to numbers. Here is the code:

 

Need help in understanding how the data is transcribed here from image to numbers. Here is the code:

filename decomp "C:\Users\Richard Boire\Desktop\train-images.idx3-ubyte";
data train_images;

   infile decomp recfm=n;
*input var $256.;
   input var PIB1.;
   run;
   proc print data=train_images(obs=10);run;

Here is the output(printed off 1st 10 records)

  			                        Obs    var

                                                  1      0
                                                  2      0
                                                  3      8
                                                  4      3
                                                  5      0
                                                  6      0
                                                  7    234
                                                  8     96
                                                  9      0
                                                 10      0

 

 

 

PROC Star
Posts: 1,759

Re: understanding image data

These are the decimal values of each byte of the file you are reading.

This:

data _null_;
  file "%sysfunc(pathname(work))\t.txt";
  put 'A' '09'x;
run;
data _null_;
  infile "%sysfunc(pathname(work))\t.txt" recfm=n;
  input X pib1.  ;
  putlog X= ;
run;

yields this (under Windows):

X=65
X=9
X=13
X=10

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