how to process tiff image

lyw8120
6 ●1 ●3 ●4

Yes, opencv can easily to read iamge, but how to process it because its compress, and its data type.

I want to do a dft after import tiff image. but failed. showed that it should be CV_32FC1, CV_32FC2 etc.

That means opencv did not convert the data type to its own data type, right?

so how to solve this problem

thanks.

3

berak
32993 ●7 ●81 ●312

this will require a grayscale(1 channel) image, so we convert it to grayscale when loading:

Mat img = imread("my.tiff", CV_LOAD_IMAGE_GRAYSCALE);

since this is still uchar data (CV_8UC1) you 'll have to convert it to floating type:

Mat ff_in;
img.convertTo( ff_in, CV_32FC1, 1.0/255.0 );  // [0..1] range

run the dft:

Mat ff_out;
dft( ff_in, ff_out );

then, convert it back:

Mat ff_gray;
ff_out.convertTo( ff_gray, CV_8UC1, 255.0 );
imshow("lalala",ff_gray);

Comments

Thanks a lot, that is what I need. the first big problem is to convert data type from one library to another one for a new man.

lyw8120 ( 2013-03-12 17:32:39 -0600 )edit

1

It is quite easy, just use the C++ functionalit which will do the type conversion for you.

Mat img = imread(location);