topic Histogram Equalization Input Image in Intel® Integrated Performance Primitives

Histogram Equalization Input Image

arrahul — Mon, 12 Sep 2011 19:10:54 GMT

Hai

Could any one please help me as to how we should provide the input image for a particular IPP Image processing fuction. My input image is in .bmp format. I am stuck with how to read this file format and set the Region of Interest. Should I use the normal fopen function and read the file byte by byte or should i go for some other method?The function in the IPP sample - iplHistoEqualize has the folowing input arguments -

IplImage* srcImage,
IplImage* dstImage,
IplLUT** lut

Please help.

Thanks
Rahul

Histogram Equalization Input Image

Anthony_P_Intel — Mon, 12 Sep 2011 23:15:37 GMT

Hi Rahul,

You may want to look at some of the code samples provided here. (Search for BMP on this web page).

Hope this helps.

-Tony

Histogram Equalization Input Image

Ying_H_Intel — Wed, 14 Sep 2011 07:38:49 GMT

Hi Rahul

Did you referred to IPL migration documentation? This is an article about how to migrate from IPL to IPP.

http://software.intel.com/en-us/articles/intel-integrated-performance-primitives-intel-ipp-domain-library-migration-faq/

Regards,

Ying

Histogram Equalization Input Image

SergeyKostrov — Thu, 03 Nov 2011 13:44:00 GMT

...Should I use the normal fopen function...

Yes. You can use any set of I/O functions:

- In case of CRT-functions:
fopen, fseek,fread, fclose;
or
_open, _filelength, _read, _close;

- In case of Win32-functions: CreateFile, GetFileSIze,ReadFile, CloseHandle;

...read the file byte by byte or should i go for some other method?..

- Byte-by-Byte reading isslow and ineffective;
- Read thefile completely in a buffer.

In general a better way is as follows:

- open a bmp-file
- getthe length
- allocate a buffer with malloc or new
- read data
- process
- save results
- deallocate the buffer with free or delete

Also, there is an example in IPL documentation onhow iplHistoEqualize must be used.

Best regards,
Sergey