Introducing Facerecognition Resetter Plugin for the Nokia N9

As my mate Simón was writing short time ago in his post Announcing the Gallery Tilt Shift plugin for the Nokia N9, we got published at Igalia some plugins for enhancing the experience of the built-in Gallery application in the N9/N950 through the Nokia Store: Enlarge & Shrink Plugin, Gallery Tilt Shift Plugin, and Facerecognition Resetter Plugin.

The Enlarge & Shrink Plugin is a filter developed by Antía Puentes for the built-in Gallery application which applies a radial distortion to a picture featuring an enlarge or shrink effect (also known as punch or pinch).

The Gallery Tilt Shift Plugin is a filter developed by Simón Pena for the built-in Gallery application which makes a picture look like a miniature.

Finally, Facerecognition Resetter Plugin was developed by me. It is a add-on for the built-in Gallery application which is not a real filter for the pictures. Instead, it is just a way of forcing the deletion or un/protection of the face recognition database through its usage from Gallery. The main reason for doing this is a well known bug in the face recognition feature.

If you are experiencing that the the N9 is not recognizing faces any more or it is not giving any more suggestions just install Facerecognition Resetter Plugin and click on the “Protect” button. You want to do this even if you are not suffering this problem since this will prevent it from appearing in the future.

BTW, comments and reviews in the Nokia Store will be welcomed 😀

But, specifically, why would we want to reset or un/protect the face recognition database? Or, actually, what the heck is that face recognition database? Let’s get to the beginning.

When Nokia released the PR1.2 update for the Harmattan platform they included a new feature which made the N9 to be the first smartphone with integrated automated face recognition.

This feature, when activated, let the Gallery or Camera application to automatically recognize faces on the pictures stored in the device, showing a white bubble with a question mark on top of the region detected as a face.

Clicking on such bubble you would be able to select one of your contacts to be assigned as the detected face.

The algorithm would be even learning as the user selected and assigned faces to contacts so at some point it would be also suggesting the proper contact for the detected faces. The user, then, would only have to double tap on the suggestion bubble to confirm such contact.

Everything seemed great but after a while, some users started to complain that this feature eventually stopped working. Either it was not suggesting anyone, when there were people tagged in a big number of pictures or it was just not recognizing faces any more.

As with any software, the face recognition feature contains bugs and this problem was the consequence of one that Nokia has not yet fixed to the current date.

The technical explanation is that the algorithm that performs the face detection relies in SQLite to store its learning parameters and contacts. This database is located at:

This file and its directory are protected through the usage of the AEGIS “powered” gallerycoredata-user user and gallerycoredata-users group. Also, the file permissions mask for them are 070 in the case of the directory and 060 in the case of the file.

When doing transactions to the database file the SQLite driver may create some temporal files as the journal one, to be able to recover the database under disaster. This journal file gets the UID and GID of the running process and the permissions from a combination of the permissions of the original database file and the running process’ umask. As a consequence, the journal file usually has the permissions mask 040.

While using the Camera or Gallery application the SQLite file is open. Whether a disaster may happen, although we hold the journal file, the owner of that file is not able to read it. Hence, the SQLite database remains useless for the processes with the same UID than the owner of the journal file, even when they belong to the same group than that file.

What it happen afterwards is that the SQLite database remained waiting to be “recovered” using the journal file but as the journal could not be read, the face recognition algorithm could not provide the learned information and suggest contacts any more. The solution for this would have been as easy as to change the file permissions of the journal file but this is not even possible for the root user since only the gallerycore-user user and those belonging to the gallerycore-users group were allowed through AEGIS to read and change the files on the parent directory of the database file.

Hence, the only way of being able to do a hack that would solve this problem was that the actual application doing such changes would be either Gallery or Camera. Fortunately, Gallery had the possibility of being extended through plugins and that’s the reason why Facerecognition Resetter is such.

Following, you can watch a video featuring an usage introduction tutorial and a detailed explanation of its usage below it.

The plugin shows 3 buttons for its corresponding actions:

  • Reset the database: As simple as that. It will delete the directory and files containing all the information gathered through the face recognition algorithm. From that on, the face recognition feature will start to work again but the learning gotten previously and powering the suggestions will be lost.
  • Protect the database: This will correct the permissions of the directories and files containing all the information gathered through the face recognition algorithm. From that on, the face recognition feature will start to work again and the suggestions would have the learning gotten previously. The problem will not show up in the future ever again but the database will remain protected and only usable through Gallery and Camera (or any other application with the proper AEGIS tokens).
  • Unprotect the database: This will correct the permissions of the directories and files containing all the information gathered through the face recognition algorithm. From that on, the face recognition feature will start to work again and the suggestions would have the learning gotten previously. The problem will not show up in the future ever again and the database will be available to any other application that would like to make use of it.

The permissions get corrected when un/protecting since the plugin sets the SGID bit to the parent directory of the database file so any other files created under it will belong to the same group than the directory and not to the GID of the running process that created that file. Also, the database will have now the 660 mask so any temporal file created by the SQLite drive will attempt to keep the same mask.

And with this, we can keep enjoying the usage of the face recognition feature of the N9 and go to celebrate it with some beers!!! 😀

This and the other plugins are Open Source, so you can go to their page at GitHub: Enlarge & Shrink, Gallery Tilt Shift and Facerecognition Resetter

Also, don’t forget to take a look at all the applications published by Igalia at the Nokia Store

Download Facerecognition Resetter Plugin from Nokia Store

¿Tendra alumnos la FIC para el curso 2012/2013?

Cualquiera podría pensar que no o, al menos, que no es lo que está buscando la mismisima plantilla educativa que trabaja en la facultad.

Y es que es difícil no pensar en esta posibilidad a la vista de esta oferta de contratación, Ref. 2012/CP/062, dónde el requisito formativo, nuevamente, no llega más allá de estar en posesión del título de bachillerato, aparte de la posible experiencia profesional.

¡Total, ¿para qué vas a querer estudiar una carrera en la FIC cuando la propia facultad no exige la titulación que imparte para realizar contrataciones?!

Dejo aquí el PDF de la oferta, por si acaso desapareciera en un tiempo.

Esta es una convocatoria que en realidad ya es vieja. El contrato era de 3 meses y la fecha estimada de inicio era mediados de junio de 2012, así que a estas alturas es posible hasta que el contrato ya se haya extinguido.

Uno no dispone de mucho tiempo para sentarse y escribir con todo el cuidado necesario este tipo de entradas. Aún así, no quería dejar de comentar esta oferta de contratación. Como ya decía anteriormente en No estudies Ing. Informática, no le interesa ni a tu facultad, aquel caso era sólo “un ejemplo más de una práctica bien generalizada” y a eso mismo suena también esta oferta de contratación.

Esta vez, además de la titulación de bachillerato se requiere “Traballo previo en investigación para tarefas de I+D, al menos 6 meses en puesto similar. Experiencia de 2 años entorno .NET C#, Hibernate, Spring, Javascript, Servicios Web WCF, SOAP.”. Vamos, que si el CV no es técnicamente tan explícito como en la anterior, tampoco es que se queden muy cortos en cuanto a detallar lo que necesitan. Sobre todo por el hecho de pedir haber trabajado 6 meses en un puesto similar. Como es I+D, ya sabemos cuantas posibilidades hay de que haya alguien investigando algo similar en otro sitio: prácticamente ninguna.

“¡Oye, que si no has trabajado con nosotros ya 6 meses antes, te puedes volver por donde has venido!”.

En todo caso, si se necesita un perfil tan especializado, lo mínimo sería pedir la titulación de Ing. Informática, ¿no?. Y con más razón cuando es un puesto para un laboratorio de la Universidad que imparte dichas titulaciones … Vamos, que estamos asistiendo de nuevo a un caso de enchufe. Esa práctica que ya incluso se está haciendo tristemente famosa como “typical Spanish” y lacra de nuestro propio desarrollo con artículos hasta en The Guardian.

Lo que no entiendo de estas convocatorias es por qué no ponen ya el nombre y apellido en los requisitos. Así nos enteraríamos mucho antes de quién es el agraciado.

El puesto es para participar en el proyecto “Axudas para a consolidación e estruturación de unidades de investigación competitivas do sistema universitario de Galicia”.

El nombre es de un abstracto que da la risa pero, resumiendo, es un puesto de trabajo financiado con fondos públicos, por si no quedaba todavía totalmente claro al ser una convocatoria de la UDC (Universidade da Coruña).

La persona admitida para estas ayudas, que es el investigador principal del proyecto y quien firma la convocatoria de contratación es Alejandro Pazos Sierra. Como vemos en su linkedin (aquí una captura), es profesor en la UDC y participa en el equipo de investigación SABIA (Sistemas Adaptativos y Bioinspirados en Inteligencia Artificial), que está integrado en el grupo de excelencia RNASA (Redes de Neuronas Artificiales y Sistemas Adaptativos), a quien pertenece el laboratorio para donde se ofertaba este contrato.

Como decía, en realidad no sé a quién estaba dirigida esta oferta de contratación. Ya dije en su momento que yo no estoy buscando perjudicar particularmente a los implicados en este tipo de convocatorias. Más al contrario, para mi está claro que son cosas como estas las que están perjudicando al común de los ingenieros al no hacer las cosas de una forma justa.

Es simplemente triste ver como las cosas en España y la Universidad no cambian y los ecos de estos comportamientos ya llegan hasta a medios internacionales.

¿Seguirá la FIC desprestigiando a su propia titulación con convocatorias como esta? Lo veremos en el futuro …