Virtual Memory Exhaust Problem in "PutAndInsertUint16Array" Function

[prakash]

Hi,

I am using this "PutAndInsertUint16Array" function to create the DICOM File. My DICOM attributes are 1000 -Image Width, 1000 - Image Height, 16 -Bits Per Pixel, and Number of Frames is 240 and getting Virtual memory exhaust problem. (DCMTK Version 3.5.4)

But when i change the number of frames to 220, it is working fine with out showing this virtual memory exhaust problem.

Please help us in solving the issue.

Regards,
Prakash

[Michael Onken]

Hi,

maybe your memory is really exhausted ?
All your frames should sum up to 1000*1000*2*240=480000000 Bytes = around 450 MegaByte. I guess you have it two times in memory, which is nearly 1 GB. Could that be a problem? If it is not grayscale but RGB data than you can multiply this with 3,ie. you have a need of 2,5-3GB of memory.

In the current snapshot versions newer to DCMTK you have a function called createValueFromTempFile which can be used in order to not having these large amounts of data in memory.

Best regards,
Michael

[Jörg Riesmeier]

... or you could use createUint16Array() to avoid copying the pixel data - this method is already available for DCMTK 3.5.4.

[prakash]

Hi Jorg,

As per your suggestion we have implemented with CreateUint16Array as follows:

PixelData = new DcmPixelData(DCM_PixelData);
Uint8* Pixels = NULL;

_DcmStatus = PixelData->createUint8Array( _DcmDemographicInfo.Rows*_DcmDemographicInfo.Columns*_DcmDemographicInfo.SamplesPerPixel*_DcmDemographicInfo.NumberOfFrames,
(Uint8 *)Pixels);

if(_DcmStatus.bad())
{
if(PixelData)
{
PixelData->clear();
delete PixelData;
PixelData=NULL;
}
_DcmErrorCode=DXSDCF_ERRORINSTORINGIMAGEDATA;
_DcmErrorString = _DcmStatus.text();
return S_FALSE;
}

FILE *FilePointer = fopen((LPCTSTR)RawFilePath,"rb");
if(_DcmDemographicInfo.NumberOfFrames==0)
{
fread(Pixels,sizeof(BYTE),_DcmDemographicInfo.Rows*_DcmDemographicInfo.Columns*_DcmDemographicInfo.SamplesPerPixel, FilePointer);
}
else
{
fread(Pixels,sizeof(BYTE),_DcmDemographicInfo.Rows*_DcmDemographicInfo.Columns*_DcmDemographicInfo.SamplesPerPixel*_DcmDemographicInfo.NumberOfFrames, FilePointer);
}

But we are getting exception in JPEGLOSSY transfer sysntax that too in Choose representation function in 3.5.4 version . Can you please help me in this regard. thank you