Kernel shut down when use FindFaces with LBP Cascades

Question

I found Mathematica can use OpenCV to improve face recognition in FindFaces: how to improve the results of the face recognition feature.

But I tried this way and the kernel crashed.

URLDownload["https://raw.githubusercontent.com/nagadomi/lbpcascade_animeface/master/lbpcascade_animeface.xml","lbpcascade_animeface.xml"];
FindFaces[img,"Image","TrainingFile" ->"lbpcascade_animeface.xml"]

Then I found that even using the files in the distribution will still cause kernel shut down.

Notice that the number disappears, the code highlight disappears, the calculation does not continue, the kernel has stopped working at this time.

Can someone else reproduce this situation, is this a bug?

I observe the same behaviour ("11.3.0 for Linux x86 (64-bit) (March 7, 2018)") — mikado, Sep 23 '18 at 11:33
This should be reported to Wolfram Support, please share then the case number so other people get a chance to follow up when new versions are released. — rhermans, Oct 25 '18 at 10:20
@rhermans Re: [CASE:4169085] I was able to reproduce the crash, however TrainingFile is not documented and not supported. — Aster, Oct 25 '18 at 10:49
Wolfram didn't care about a crash just because the function was not documented? — ktm, Oct 29 '18 at 23:34

score 4 · Answer 1 · answered Sep 24 '18 at 18:49

I launch Mathematica from a bash shell under linux and get the following error message when the kernel crashes:

OpenCV Error: Unspecified error (The node does not represent a user object (unknown type?)) in cvRead, file /home/usr0/matthias/tmp/opencv/opencv-3.1.0/modules/core/src/persistence.cpp, line 4976
terminate called after throwing an instance of 'cv::Exception'
what():  /home/usr0/matthias/tmp/opencv/opencv-3.1.0/modules/core/src/persistence.cpp:4976: error: (-2) The node does not represent a user object (unknown type?) in function cvRead

I guess that you have triggered an error in OpenCV.

Nice find. Still, Mathematica should be resilient to errors in external calls. This should be reported to Wolfram Support. — rhermans, Oct 25 '18 at 10:20

score 2 · Accepted Answer · answered Apr 18 '19 at 05:21

2

Fixed in Version 12.

animeface = FindFaces[#,
    "Method" -> "LocalBinaryPatterns",
    "TrainingFile" -> "lbpcascade_animeface.xml",
    AcceptanceThreshold -> 0.1,
    "ScaleDecreaseFraction" -> 1
]&;
HighlightImage[img, {"Boundary", Green, animeface[#]&}]

Remark:

Method must be set
Image`HumanDump`FindFacesHiddenOptions

answered Apr 18 '19 at 05:21

Aster

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That's very interesting. Is there a repository somewhere for LBP xml files like the one you used? – Carl Lange Apr 18 '19 at 07:20
@CarlLange, OpenCV maintained some. Or search lbpcascade in google or github. – Aster Apr 18 '19 at 07:40

Kernel shut down when use FindFaces with LBP Cascades

2 Answers2