IPPI Morphological operations vs. Min/Max Filtering

[adi_shavit]

Hi,

What is the difference between the "morphological operations" e.g. ippiDilate_() and the filtering functions e.g. ippiFilterMax_(). These are defined to be identical.

Is there an implementation difference?
Is there a performance difference?
And if so why?

Thanks,
Adi

[Vladimir_Dudnik]

Hi Adi,

Min/Max filters work as general filters with rectangular kernel. Morphological functions with rectangular kernel may have the same realization as Min/Max filters, but in addition they support arbitrary kernel/mask. So they have different API and functionality.

Regards,
Vladimir

[adi_shavit]

Hi,

I see, so basically for rectangular kernels the performance should be the same, or is the "simpler" implementation of min/max faster?

(Of course, I can check but I'm wondering implementation-wise.)

Adi

[Vladimir_Dudnik]

Hi Adi,

you can compare performance of different IPP functions on different architectures, just find IPP performance data in your IPP oolsperfsysdata folder.

For example, ippiFilterMax_8u_C1 function shows the folloving performance on 3050MHz Pentium 4 with HT tech with image 720x480:

ippiFilterMax_8u_C1R, image 720x480, kernel 3x3,4.3 cpe, 496 usec
ippiFilterMax_8u_C1R, image 720x480, kernel 5x5,6.4 cpe, 723 usec

whereas performance ofippiDilate_8u_C1 function in the same conditionslooks like:

ippiDilate_8u_C1R, image 720x480, kernel 3x3, 8.1 cpe, 922 usec
ippiDilate_8u_C1R, image 720x480, kernel 5x5, 20 cpe, 2.35e+003 usec

Here,

cpe is cpu clock per pixel

usec is microseconds per image

Regards,

Vladimir