Articles

• J. Hakala and J. Häkkinen, “A Method for Measuring Contact Points in Human–Object Interaction Utilizing Infrared Cameras,” Frontiers in Robotics and AI, vol. 8, pp. 1-7, 2022.
  [Bibtex]

  @article{Hakala2022,
  abstract = {This article presents a novel method for measuring contact points in human–object interaction. Research in multiple prehension-related fields, e.g., action planning, affordance, motor function, ergonomics, and robotic grasping, benefits from accurate and precise measurements of contact points between a subject’s hands and objects. During interaction, the subject’s hands occlude the contact points, which poses a major challenge for direct optical measurement methods. Our method solves the occlusion problem by exploiting thermal energy transfer from the subject’s hand to the object surface during interaction. After the interaction, we measure the heat emitted by the object surface with four high-resolution infrared cameras surrounding the object. A computer-vision algorithm detects the areas in the infrared images where the subject’s fingers have touched the object. A structured light 3D scanner produces a point cloud of the scene, which enables the localization of the object in relation to the infrared cameras. We then use the localization result to project the detected contact points from the infrared camera images to the surface of the 3D model of the object. Data collection with this method is fast, unobtrusive, contactless, markerless, and automated. The method enables accurate measurement of contact points in non-trivially complex objects. Furthermore, the method is extendable to measuring surface contact areas, or patches, instead of contact points. In this article, we present the method and sample grasp measurement results with publicly available objects.},
  author = {Jussi Hakala and Jukka H{\"{a}}kkinen},
  doi = {10.3389/frobt.2021.800131},
  issn = {2296-9144},
  issue = {February},
  journal = {Frontiers in Robotics and AI},
  keywords = {contact point,grasping,infrared camera,prehension movements,touch},
  month = {2},
  pages = {1-7},
  title = {A Method for Measuring Contact Points in Human–Object Interaction Utilizing Infrared Cameras},
  volume = {8},
  url = {https://www.frontiersin.org/articles/10.3389/frobt.2021.800131/full},
  year = {2022},
  }

• H. Leder, J. Hakala, V. Peltoketo, C. Valuch, and M. Pelowski, “Swipes and Saves: A Taxonomy of Factors Influencing Aesthetic Assessments and Perceived Beauty of Mobile Phone Photographs,” Frontiers in Psychology, vol. 13, 2022.
  [Bibtex]

  @article{Leder2022,
  abstract = {Digital images taken by mobile phones are the most frequent class of images created today. Due to their omnipresence and the many ways they are encountered, they require a specific focus in research. However, to date, there is no systematic compilation of the various factors that may determine our evaluations of such images, and thus no explanation of how users select and identify relatively “better” or “worse” photos. Here, we propose a theoretical taxonomy of factors influencing the aesthetic appeal of mobile phone photographs. Beyond addressing relatively basic/universal image characteristics, perhaps more related to fast (bottom-up) perceptual processing of an image, we also consider factors involved in the slower (top-down) re-appraisal or deepened aesthetic appreciation of an image. We span this taxonomy across specific types of picture genres commonly taken—portraits of other people, selfies, scenes and food. We also discuss the variety of goals, uses, and contextual aspects of users of mobile phone photography. As a working hypothesis, we propose that two main decisions are often made with mobile phone photographs: (1) Users assess images at a first glance—by swiping through a stack of images—focusing on visual aspects that might be decisive to classify them from “low quality” (too dark, out of focus) to “acceptable” to, in rare cases, “an exceptionally beautiful picture.” (2) Users make more deliberate decisions regarding one’s “favorite” picture or the desire to preserve or share a picture with others, which are presumably tied to aspects such as content, framing, but also culture or personality, which have largely been overlooked in empirical research on perception of photographs. In sum, the present review provides an overview of current focal areas and gaps in research and offers a working foundation for upcoming research on the perception of mobile phone photographs as well as future developments in the fields of image recording and sharing technology.},
  author = {Helmut Leder and Jussi Hakala and Veli-tapani Peltoketo and Christian Valuch and Matthew Pelowski},
  doi = {10.3389/fpsyg.2022.786977},
  issn = {1664-1078},
  issue = {February},
  journal = {Frontiers in Psychology},
  month = {2},
  title = {Swipes and Saves: A Taxonomy of Factors Influencing Aesthetic Assessments and Perceived Beauty of Mobile Phone Photographs},
  volume = {13},
  url = {https://www.frontiersin.org/articles/10.3389/fpsyg.2022.786977/full},
  year = {2022},
  }

• J. Hakala, J. Kätsyri, T. Takala, and J. Häkkinen, “Perception of stereoscopic direct gaze: The effects of interaxial distance and emotional facial expressions,” Journal of Vision, vol. 16, iss. 9, 2016.
  [Bibtex]

  @article{Hakala2016,
  author = {Hakala, Jussi and K{\"{a}}tsyri, Jari and Takala, Tapio and H{\"{a}}kkinen, Jukka},
  doi = {10.1167/16.9.5},
  issn = {1534-7362},
  journal = {Journal of Vision},
  month = {jul},
  number = {9},
  title = {{Perception of stereoscopic direct gaze: The effects of interaxial distance and emotional facial expressions}},
  url = {http://jov.arvojournals.org/article.aspx?doi=10.1167/16.9.5},
  volume = {16},
  year = {2016}
  }

• J. Hakala, J. Kätsyri, and J. Häkkinen, “Stereoscopy Amplifies Emotions Elicited by Facial Expressions,” i-Perception, vol. 6, iss. 6, 2015.
  [Bibtex]

  @article{Hakala2015b,
  author = {Hakala, Jussi and K{\"{a}}tsyri, Jari and H{\"{a}}kkinen, Jukka},
  doi = {10.1177/2041669515615071},
  issn = {2041-6695},
  journal = {i-Perception},
  keywords = {face perception,mentalizing,presence,self-relevance,theory of mind,three-dimensional},
  month = {nov},
  number = {6},
  title = {{Stereoscopy Amplifies Emotions Elicited by Facial Expressions}},
  url = {http://ipe.sagepub.com/lookup/doi/10.1177/2041669515615071},
  volume = {6},
  year = {2015}
  }

• J. H. Hakala, P. Oittinen, and J. P. Häkkinen, “Depth Artifacts Caused by Spatial Interlacing in Stereoscopic 3D Displays,” ACM Transactions on Applied Perception, vol. 12, iss. 1, p. 1–13, 2015.
  [Bibtex]

  @article{Hakala2015a,
  author = {Hakala, Jussi H and Oittinen, Pirkko and H\"{a}kkinen, Jukka P.},
  doi = {10.1145/2699266},
  issn = {15443558},
  journal = {ACM Transactions on Applied Perception},
  number = {1},
  pages = {1--13},
  title = {{Depth Artifacts Caused by Spatial Interlacing in Stereoscopic 3D Displays}},
  url = {http://dl.acm.org/citation.cfm?doid=2737796.2699266},
  volume = {12},
  year = {2015}
  }

• T. Mustonen, J. Kimmel, J. Hakala, and J. Hakkinen, “Visual Performance With Small Concave and Convex Displays,” Human Factors: The Journal of the Human Factors and Ergonomics Society, 2015.
  [Bibtex]

  @article{Mustonen2015,
  author = {Mustonen, Terhi and Kimmel, Jyrki and Hakala, J. and Hakkinen, J.},
  doi = {10.1177/0018720815570090},
  issn = {0018-7208},
  journal = {Human Factors: The Journal of the Human Factors and Ergonomics Society},
  keywords = {address correspondence to terhi,behavioural sciences,box 9,flexible displays,handheld devices,institute of,letter identification,mustonen,o,p,performance,siltavuorenpenger 1,user,visual search},
  title = {{Visual Performance With Small Concave and Convex Displays}},
  url = {http://hfs.sagepub.com/cgi/doi/10.1177/0018720815570090},
  year = {2015}
  }

• J. Hakala, S. Westman, M. Salmimaa, M. Pölönen, T. Järvenpää, and J. Häkkinen, “Why 3D Cameras are Not Popular: A Qualitative User Study on Stereoscopic Photography Acceptance,” 3D Research, vol. 5, iss. 1, p. 1–18, 2014.
  [Bibtex]

  @article{Hakala2014,
  author = {Hakala, Jussi and Westman, Stina and Salmimaa, Marja and P\"{o}l\"{o}nen, Monika and J\"{a}rvenp\"{a}\"{a}, Toni and H\"{a}kkinen, Jukka},
  doi = {10.1007/s13319-013-0004-1},
  issn = {2092-6731},
  journal = {3D Research},
  keywords = {acceptance,cameras,disparity,experience,learning,motivation,photographing,stereoscopic 3d,usability},
  month = jan,
  number = {1},
  pages = {1--18},
  title = {{Why 3D Cameras are Not Popular: A Qualitative User Study on Stereoscopic Photography Acceptance}},
  url = {http://link.springer.com/10.1007/s13319-013-0004-1},
  volume = {5},
  year = {2014}
  }

• M. Pölönen, J. Hakala, R. Bilcu, T. Järvenpää, J. Häkkinen, and M. Salmimaa, “Color asymmetry in 3D imaging: Influence on the viewing experience,” 3D Research, vol. 3, iss. 3, p. 1–10, 2012.
  [Bibtex]

  @article{Polonen2012,
  author = {P\"{o}l\"{o}nen, Monika and Hakala, Jussi and Bilcu, Radu and J\"{a}rvenp\"{a}\"{a}, Toni and H\"{a}kkinen, Jukka and Salmimaa, Marja},
  doi = {10.1007/3DRes.02(2012)5},
  issn = {2092-6731},
  journal = {3D Research},
  keywords = {and right eyes to,color asymmetry,corresponding points of the,depth perception,experience,images in the left,naturalness,produce depth,retinal,stereoscopic content,used to search the,viewing},
  month = aug,
  number = {3},
  pages = {1--10},
  title = {{Color asymmetry in 3D imaging: Influence on the viewing experience}},
  url = {http://www.springerlink.com/index/10.1007/3DRes.02(2012)5},
  volume = {3},
  year = {2012}
  }

• M. Kytö, J. Hakala, P. Oittinen, and J. Häkkinen, “Effect of camera separation on the viewing experience of stereoscopic photographs,” Journal of Electronic Imaging, vol. 21, iss. 1, p. 011011–9, 2012.
  [Bibtex]

  @article{Kyto2012a,
  author = {Kyt\"{o}, Mikko and Hakala, Jussi and Oittinen, Pirkko and H\"{a}kkinen, Jukka},
  doi = {10.1117/1.JEI.21.1.011011},
  issn = {10179909},
  journal = {Journal of Electronic Imaging},
  keywords = {camera separation,depth perception,mobile imaging,stereoscopic imaging,subjective assessment,viewing experience},
  number = {1},
  pages = {011011--9},
  title = {{Effect of camera separation on the viewing experience of stereoscopic photographs}},
  volume = {21},
  year = {2012}
  }

In Collections

• M. Ammad-ud-din, A. Asatiani, J. Hakala, T. Itälä, P. Ståhlberg, J. Suvilehto, and H. Jin, “Television’s Next Top Business Model: Personalized and Pervasive,” in Future of Media, Y. Neuvo, E. Ormala, and M. Kuikka, Eds., Helsinki: Aalto University Publications, 2014, p. 107–138.
  [Bibtex]

  @incollection{Ammad-ud-din2014,
  address = {Helsinki},
  author = {Ammad-ud-din, Muhammad and Asatiani, Aleksandre and Hakala, Jussi and It{\"{a}}l{\"{a}}, Timo and St{\aa}hlberg, Pauliina and Suvilehto, Juulia and Jin, Helena},
  booktitle = {Future of Media},
  editor = {Neuvo, Yrj{\"{o}} and Ormala, Erkki and Kuikka, Meri},
  isbn = {978-952-60-1088-5},
  pages = {107--138},
  publisher = {Aalto University Publications},
  title = {{Television's Next Top Business Model: Personalized and Pervasive}},
  url = {https://aaltodoc.aalto.fi/handle/123456789/14702},
  year = {2014}
  }

• J. Hakala, E. Rytkönen, K. Snellman, N. Särkkä, V. B. T. Dung, and H. Jin, “Ethical Personalisation Act 2025,” in Future of Media, Y. Neuvo, E. Ormala, and M. Kuikka, Eds., Helsinki: Aalto University Publications, 2014, p. 213–243.
  [Bibtex]

  @incollection{Hakala2014b,
  address = {Helsinki},
  author = {Hakala, Jussi and Rytk{\"{o}}nen, Eelis and Snellman, Kirsi and S{\"{a}}rkk{\"{a}}, Nanna and Dung, Vu Ba Tien and Jin, Helena},
  booktitle = {Future of Media},
  editor = {Neuvo, Yrj{\"{o}} and Ormala, Erkki and Kuikka, Meri},
  isbn = {978-952-60-1088-5},
  pages = {213--243},
  publisher = {Aalto University Publications},
  title = {{Ethical Personalisation Act 2025}},
  url = {https://aaltodoc.aalto.fi/handle/123456789/14702},
  year = {2014}
  }

In Proceedings

• M. Ponomarenko, S. G. Bahnemiri, K. Egiazarian, O. Ieremeiev, V. Lukin, V. T. Peltoketo, and J. Hakala, “Color Image Database HTID for Verification of No-Reference Metrics: Peculiarities and Preliminary Results,” in Proceedings – European Workshop on Visual Information Processing, EUVIP, 2021, pp. 23-25.
  [Bibtex]

  @inproceedings{Ponomarenko2021,
  abstract = {The paper describes a new image database HTID for verification and training of no-reference image visual quality metrics. The database contains 2880 color images of size 1536×1024 pixels cropped from the real-life photos produced by the mobile phone cameras with various shooting and post-processing settings. Mean opinion scores for images of the database are obtained. Peculiarities of the database are considered. A comparative analysis of the state-of-The-Art no-reference image visual quality metrics is carried out. It is shown that the proposed database takes its own unique place in the existing image databases and can be effectively used for metrics' verification.},
  author = {Mykola Ponomarenko and Sheyda Ghanbaralizadeh Bahnemiri and Karen Egiazarian and Oleg Ieremeiev and Vladimir Lukin and Veli Tapani Peltoketo and Jussi Hakala},
  booktitle = {Proceedings - European Workshop on Visual Information Processing, EUVIP},
  doi = {10.1109/EUVIP50544.2021.9484005},
  isbn = {9781665432306},
  issn = {24718963},
  keywords = {image databases,mean opinion scores,no-reference image visual quality assessment},
  pages = {23-25},
  publisher = {IEEE},
  title = {Color Image Database HTID for Verification of No-Reference Metrics: Peculiarities and Preliminary Results},
  volume = {2021-June},
  year = {2021},
  }

• M. Salmimaa, J. Hakala, M. Pölönen, T. Järvenpää, R. Bilcu, and J. Häkkinen, “55.2: Luminance Asymmetry in Stereoscopic Content: Binocular Rivalry or Luster,” in SID Symposium Digest of Technical Papers, 2014, p. 801–804.
  [Bibtex]

  @inproceedings{Salmimaa2014,
  author = {Salmimaa, Marja and Hakala, Jussi and P\"{o}l\"{o}nen, Monika and J\"{a}rvenp\"{a}\"{a}, Toni and Bilcu, Radu and H\"{a}kkinen, Jukka},
  booktitle = {SID Symposium Digest of Technical Papers},
  doi = {10.1002/j.2168-0159.2014.tb00210.x},
  issn = {0097966X},
  month = jun,
  number = {1},
  pages = {801--804},
  title = {{55.2: Luminance Asymmetry in Stereoscopic Content: Binocular Rivalry or Luster}},
  url = {http://doi.wiley.com/10.1002/j.2168-0159.2014.tb00210.x},
  volume = {45},
  year = {2014}
  }

• J. Li, O. Kaller, F. De Simone, J. Hakala, D. Juszka, and P. Le Callet, “Cross-lab study on preference of experience in 3DTV: Influence from display technology and test environment,” in 2013 Fifth International Workshop on Quality of Multimedia Experience (QoMEX), 2013, p. 46–47.
  [Bibtex]

  @inproceedings{Li2013,
  author = {Li, Jing and Kaller, Ondrej and De Simone, Francesca and Hakala, Jussi and Juszka, Dawid and Le Callet, Patrick},
  booktitle = {2013 Fifth International Workshop on Quality of Multimedia Experience (QoMEX)},
  doi = {10.1109/QoMEX.2013.6603207},
  isbn = {978-1-4799-0738-0},
  month = jul,
  pages = {46--47},
  publisher = {IEEE},
  title = {{Cross-lab study on preference of experience in 3DTV: Influence from display technology and test environment}},
  url = {http://ieeexplore.ieee.org/xpls/abs\_all.jsp?arnumber=6603207 http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6603207},
  year = {2013}
  }

• P. Aflaki, M. Hannuksela, J. Hakala, J. Hakkinen, and M. Gabbouj, “Joint Adaptation of Spatial Resolution and Sample Value Quantization for Asymmetric Stereoscopic Video Compression : a Subjective Study,” in Image and Signal Processing and Analysis (ISPA), 2011 7th International Symposium on, 2011, p. 396–401.
  [Bibtex]

  @inproceedings{Aflaki2011a,
  author = {Aflaki, Payman and Hannuksela, Miska and Hakala, Jussi and Hakkinen, Jukka and Gabbouj, Moncef},
  booktitle = {Image and Signal Processing and Analysis (ISPA), 2011 7th International Symposium on},
  number = {Ispa},
  pages = {396--401},
  title = {{Joint Adaptation of Spatial Resolution and Sample Value Quantization for Asymmetric Stereoscopic Video Compression : a Subjective Study}},
  year = {2011}
  }

• P. Aflaki, M. Hannuksela, J. Hakala, J. Häkkinen, and M. Gabbouj, “Estimation of subjective quality for mixed-resolution stereoscopic video,” in 2011 3DTV Conference: The True Vision – Capture, Transmission and Display of 3D Video (3DTV-CON), 2011, p. 1–4.
  [Bibtex]

  @inproceedings{Aflaki2011,
  author = {Aflaki, Payman and Hannuksela, Miska and Hakala, Jussi and H\"{a}kkinen, Jukka and Gabbouj, Moncef},
  booktitle = {2011 3DTV Conference: The True Vision - Capture, Transmission and Display of 3D Video (3DTV-CON)},
  doi = {10.1109/3DTV.2011.5877171},
  isbn = {978-1-61284-161-8},
  month = may,
  pages = {1--4},
  publisher = {IEEE},
  title = {{Estimation of subjective quality for mixed-resolution stereoscopic video}},
  url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5877171},
  year = {2011}
  }

• M. Kytö and J. Hakala, “Geometric and subjective analysis of stereoscopic I3A cluster images,” in Proc. SPIE, 2011, p. 786319–1–8.
  [Bibtex]

  @inproceedings{Kyto2011a,
  author = {Kyt\"{o}, Mikko and Hakala, Jussi},
  booktitle = {Proc. SPIE},
  doi = {10.1117/12.872519},
  issn = {0277-786X},
  keywords = {camera separation,depth sensation,i3a,imaging geometry,stereoscopic imaging,visual experience},
  pages = {786319--1--8},
  title = {{Geometric and subjective analysis of stereoscopic I3A cluster images}},
  url = {dx.doi.org/10.1117/12.872519},
  volume = {7863},
  year = {2011}
  }

• J. Häkkinen, J. Hakala, M. Hannuksela, and P. Oittinen, “Effect of image scaling on stereoscopic movie experience,” in Proc. SPIE, 2011, p. 78630R–1–12.
  [Bibtex]

  @inproceedings{Hakkinen2011,
  author = {H\"{a}kkinen, Jukka and Hakala, Jussi and Hannuksela, Miska and Oittinen, Pirkko},
  booktitle = {Proc. SPIE},
  doi = {10.1117/12.872530},
  keywords = {image quality,image scaling,stereoscopic film,stereoscopic quality,viewing distance},
  pages = {78630R--1--12},
  title = {{Effect of image scaling on stereoscopic movie experience}},
  url = {dx.doi.org/10.1117/12.872530},
  volume = {7863},
  year = {2011}
  }

• J. Hakala, M. Nuutinen, and P. Oittinen, “Interestingness of stereoscopic images,” in Proc. SPIE, 2011, p. 78631S–1–11.
  [Bibtex]

  @inproceedings{Hakala2011a,
  author = {Hakala, Jussi and Nuutinen, Mikko and Oittinen, Pirkko},
  booktitle = {Proc. SPIE},
  doi = {10.1117/12.872437},
  pages = {78631S--1--11},
  title = {{Interestingness of stereoscopic images}},
  volume = {7863},
  year = {2011}
  }

Dissertations

• J. Hakala, “Stereoscopic Imaging Technology: Perception, Emotion, and Acceptance,” PhD Thesis, 2016.
  [Bibtex]

  @phdthesis{Hakala2016a,
  author = {Hakala, Jussi},
  keywords = {binocular perception,eye contact,facial expressions,gaze,stereoscopy},
  pages = {67},
  school = {Aalto University},
  title = {{Stereoscopic Imaging Technology: Perception, Emotion, and Acceptance}},
  url = {http://urn.fi/URN:ISBN:978-952-60-7063-6},
  year = {2016}
  }