dlib build arm64 in iPhone6 use frontal_face_detector too slow

[linconz]

Hi,I am using dlib version is 19.17, and use cmake gui tool to generate Xcode project to build dlib static library. On iPhone6 call get_frontal_face_detector this API for face detection is very very slow. Most of the time to detect a picture of 438 * 438 pixels will use 5 seconds.

This is CMake GUI build setting:

and Xcode build setting made some changes: First, I change base SDK to 'iOS',and Supported Platforms to 'iOS', As well as Valid Architectures to 'arm64 arm64e armv7 armv7s' to adapt to the iOS platform compilation:

Second, I saw some issues talk about arm64 or cross compile need set '-mfpu=neon' or SSE4 or AVX configure, in my case, I'm setting Other Link Flags like this:

But,when finish build,in Build log have so many tips:

It seems not work on Xcode.

In the end,I write some code want to test detect face in image:

- (void)hogFindFaceWithImageName:(NSString *)imageName
{
    NSString *imagePath = [[NSBundle mainBundle] pathForResource:imageName ofType:@"jpg"];
    matrix<rgb_pixel> img;
    load_image(img, [imagePath UTF8String]);

    frontal_face_detector detector = get_frontal_face_detector();

    NSLog(@"detect start");
    std::vector<rectangle> faces = detector(img);
    NSLog(@"detect finish");
    rectangle firstFace = faces[0];
    auto shape = self.sp(img, firstFace);
}

And the print log is:

2019-07-02 15:30:38.138084+0800 TestDlibFaceRecogition[357:36574] detect start
2019-07-02 15:30:43.477129+0800 TestDlibFaceRecogition[357:36574] detect finish

It's very slow, Why?

By the way, picture is Obama:

[linconz]

Please forgive my English is not good

[dlib-issue-bot]

Warning: this issue has been inactive for 35 days and will be automatically closed on 2019-08-16 if there is no further activity.

If you are waiting for a response but haven't received one it's possible your question is somehow inappropriate. E.g. it is off topic, you didn't follow the issue submission instructions, or your question is easily answerable by reading the FAQ, dlib's official compilation instructions, dlib's API documentation, or a Google search.

[linconz]

Warning: this issue has been inactive for 35 days and will be automatically closed on 2019-08-16 if there is no further activity.

If you are waiting for a response but haven't received one it's possible your question is somehow inappropriate. E.g. it is off topic, you didn't follow the issue submission instructions, or your question is easily answerable by reading the FAQ, dlib's official compilation instructions, dlib's API documentation, or a Google search.

so sad

[dlib-issue-bot]

Warning: this issue has been inactive for 35 days and will be automatically closed on 2019-09-21 if there is no further activity.

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[dlib-issue-bot]

Warning: this issue has been inactive for 43 days and will be automatically closed on 2019-09-21 if there is no further activity.

If you are waiting for a response but haven't received one it's possible your question is somehow inappropriate. E.g. it is off topic, you didn't follow the issue submission instructions, or your question is easily answerable by reading the FAQ, dlib's official compilation instructions, dlib's API documentation, or a Google search.

[dlib-issue-bot]

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