Hi Ricardo, There are problems with the OpenCV VAPI that I discovered while trying to integrate OpenCV directly.OpenCV is not C compatible anymore in the recent 3.x versions (https://github.com/opencv/opencv/issues/10963). So I had to create another VAPI bridge that took in plain C structures and then called the OpenCV functions. This bridge is wrapped in extern "C" so that vala can talk to it. OpenCV libraries are linked to the shotwell executable at the link stage.I think we can defer OpenCL usage until OpenCV3 gets into debian (it is available on my archlinux machine). I have forked the shotwell repo and created wip/faces branch with my current WIP changes:https://gitlab.gnome.org/nma83/shotwell/tree/wip/faces The face detection works as it used to in this branch, but using the VAPI bridge to OpenCV instead of another process.I am exploring other options for better accuracy - OpenCV with DNN or dlib. The UI changes should not conflict with my change like you said, so merge should be seamless once we get there. Thanks,Narendra
From: Ricardo <ricardofantin gmail com>To: Narendra Acharya <narendra_m_a yahoo com>Cc: "shotwell-list gnome org" <shotwell-list gnome org>Subject: Re: [Shotwell] Enhance face detectionDate: Fri, 22 Jun 2018 10:48:21 -0300Hello.In https://valadoc.org/opencv/index.htm there is a vapi to link directfrom vala to opencv without c/c++ in the middle. Some considerations:First, it use OpenCV 2 which cannot detect automatically the presenceof a graphic card capable to use OpenCL.Second, in the last stable Debian the OpenCV3 is not available yet. Soit would not be possible to easily compile it in Debian.In the vapi, the functions about matrix eigenvalues to recognizespecific person faces are available too.I'm working in a new user experience -https://gitlab.gnome.org/GNOME/shotwell/issues/13 - for faces. If youwork in bring the OpenCV3 to valadoc and use that vapi in shotwellprobably we will not work in the same lines of code and we will nothave much work in a merge.Phako, some time ago in a pull-request you mentioned that the use ofc++ is not a big issue. Is ok to Narendra work in the use of theOpenCV vapi in shotwell now?Bye,Ricardo.2018-06-22 5:08 GMT-03:00, Narendra Acharya via shotwell-list<shotwell-list gnome org>: Hi, I was looking at the current face detection code in shotwell 0.29.2 and feel that it can be enhanced.So I pulled the code from https://gitlab.gnome.org/GNOME/shotwell.git and started making some changes.1. Do not run another process for face detection (shotwell-facedetect) but integrate the OpenCV calls into shotwell and link to OpenCV libraries2. Ability to use OpenCL when available on the platform using T-API in OpenCV 3.x3. Eventually add face recognition on photos using a trained model based on faces labelled by the user - this would need a few faces to be tagged by the user before the OpenCV face recognition calls can be used (https://docs.opencv.org/2.4/modules/contrib/doc/facerec/facerec_tutorial.html). Is there anyone else working on this area? Thanks,Narendra
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