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Convert Mat to 16 bit int

asked 2016-11-18 01:48:21 -0500

ManuKlause gravatar image

Hi,

I want to convert my 16 bit images from format cv::Mat to 16 bit. Currently, I am using this function

int size = image.total() * image.elemSize(); // number of elements * size of elements
float * bytes = new float[size];  
std::memcpy(bytes, &image.data, size * sizeof(float));
return bytes;

which only allows me to use 8 bit images (format bytes). Do you know a function call to convert cv::Mat to my desired bit format?

Best

ManuKlause

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aww dear, code above is all wrong (why float? size is also already in bytes)

can't you just use mat1.convertTo(mat2, CV_16U)

berak gravatar imageberak ( 2016-11-18 01:53:24 -0500 )edit

I want to use the data of cv::Mat in CUDA, and CUDA does not support cv::Mat. So, using mat1.convertTo(mat2, CV_16U) wouldnt be helpful.

ManuKlause gravatar imageManuKlause ( 2016-11-18 01:59:11 -0500 )edit

wait, i probably misread it. are those Mat's 16bit already ?

you could still get ushort*ps = mat.ptr<ushort>()

berak gravatar imageberak ( 2016-11-18 02:04:11 -0500 )edit
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Yes, they are 16 bit.

ManuKlause gravatar imageManuKlause ( 2016-11-18 02:12:13 -0500 )edit

ah, ok, does not need any conversion , then (my bad)

berak gravatar imageberak ( 2016-11-18 02:13:14 -0500 )edit

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answered 2016-11-18 02:18:36 -0500

berak gravatar image

updated 2016-11-18 02:51:04 -0500

if you have a 16bit Mat (CV_16U), please access the underlying memory like:

CV_Assert(mat.type() == CV_16U); // make sure !    
ushort * ps = mat.ptr<ushort>(); // ptr to 1st element

if you need a copy of that, it's :

size_t len = mat.total() * mat.elemSize(); // in bytes
ushort *cs = new ushort[len]; // *not* float!
memcpy(cs, mat.ptr<ushort>(), len);
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Asked: 2016-11-18 01:48:21 -0500

Seen: 2,782 times

Last updated: Nov 18 '16