Converting CV::Mat to double *

CvMat

asked Feb 8 '17

BhanuKiran
21 ●3 ●5

Hi,

I am using C++ openCV-3.2.0 version.

I am also using a library for line segment detection,which takes only .pgm image of data type double *. I used

cv::Mat pgm_image;

pgm_image = cv::imread("image.pgm");

double *I = pgm_image.ptr<double>(0);

to read the image and to for getting pointer. And i tried parsing double * into the library that i am using. Is there any way around this? or Is there a way read .pgm file directly as double* ?

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i doubt, that there is double data inside your PGM file .

can you show the file header ?

head -c 200 image.pgm

(then add to your question)

berak (Feb 8 '17)edit

Hi, It looked like this

820 615

255

188 188 188 190 .........

BhanuKiran (Feb 8 '17)edit

add a comment

Mat pgm_image = imread("image.pgm", IMREAD_GRAYSCALE); //flag is important ! Mat pgm_double; pgm_image.convertTo(pgm_double, CV_64F); // optionally scale by 1.0/255, if you need [0..1] range double *I = pgm_double.ptr<double>(0);

Converting CV::Mat to double *

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Converting CV::Mat to double *