Which version of OpenCV allows using universal intrinsics?

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Thanks. I have just built OpenCV 4.2.0 and it was slower than 3.4.5! So, I'm uninstalling it and go back to 3.4.5 version. Could you please explain the possible reasons? The Cmake flags I used, were the same for 3.4.5 and 4.2.0.

I would run the perf tests and compare the results between the two versions.

What functions are you using? Best is to use a profiler to pinpoint the bottleneck.

Normally, there is no obvious reason about why 4.20 is slower than 3.4.5 in your case.

Edit your question to post the OpenCV information, and some information about your CPU, environment: std::cout << cv::getBuildInformation() << std::endl;

@Zana Zakaryaie Nejad. OpenCV version x.x.x are not slower. You have to edited your code to improvement. Get back OpenCV 4.2.0.

@supra56, @Eduardo Thanks for the replies. It was also strange for me to see that difference in runtimes. I checked more and found that it was just an issue with the power of my Laptop!! When I plugged the charger, the speed of 4.2.0 was same as 3.4.5.

Anyway, according to your suggestions, I can use OpenCV 4.2.0. Are there any flags I should set to be able to use both SSE2 and Neon? (e.g. CPU_BASELINE=SSE2 CPU_DISPATCH=SSE4_2,AVX)

No need to tweak the flags, just let the automatic detection. It is one library per architecture, that is one library for x86, one library for ARM, one library for PowerPC, ...

No. You don't need flags.