Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Automated Taxonomic Identification of Insects with Expert-Level Accuracy Using Effective Feature Transfer from Convolutional Networks
Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen. Savantic AB, Sweden; Swedish Museum of Natural History, Sweden.
Visa övriga samt affilieringar
Antal upphovsmän: 52019 (Engelska)Ingår i: Systematic Biology, ISSN 1063-5157, E-ISSN 1076-836X, Vol. 68, nr 6, s. 876-895Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Rapid and reliable identification of insects is important in many contexts, from the detection of disease vectors and invasive species to the sorting of material from biodiversity inventories. Because of the shortage of adequate expertise, there has long been an interest in developing automated systems for this task. Previous attempts have been based on laborious and complex handcrafted extraction of image features, but in recent years it has been shown that sophisticated convolutional neural networks (CNNs) can learn to extract relevant features automatically, without human intervention. Unfortunately, reaching expert-level accuracy in CNN identifications requires substantial computational power and huge training data sets, which are often not available for taxonomic tasks. This can be addressed using feature transfer: a CNN that has been pretrained on a generic image classification task is exposed to the taxonomic images of interest, and information about its perception of those images is used in training a simpler, dedicated identification system. Here, we develop an effective method of CNN feature transfer, which achieves expert-level accuracy in taxonomic identification of insects with training sets of 100 images or less per category, depending on the nature of data set. Specifically, we extract rich representations of intermediate to high-level image features from the CNN architecture VGG16 pretrained on the ImageNet data set. This information is submitted to a linear support vector machine classifier, which is trained on the target problem. We tested the performance of our approach on two types of challenging taxonomic tasks: 1) identifying insects to higher groups when they are likely to belong to subgroups that have not been seen previously and 2) identifying visually similar species that are difficult to separate even for experts. For the first task, our approach reached 92% accuracy on one data set (884 face images of 11 families of Diptera, all specimens representing unique species), and 96% accuracy on another (2936 dorsal habitus images of 14 families of Coleoptera, over 90% of specimens belonging to unique species). For the second task, our approach outperformed a leading taxonomic expert on one data set (339 images of three species of the Coleoptera genus Oxythyrea; 97% accuracy), and both humans and traditional automated identification systems on another data set (3845 images of nine species of Plecoptera larvae; 98.6 % accuracy). Reanalyzing several biological image identification tasks studied in the recent literature, we show that our approach is broadly applicable and provides significant improvements over previous methods, whether based on dedicated CNNs, CNN feature transfer, or more traditional techniques. Thus, our method, which is easy to apply, can be highly successful in developing automated taxonomic identification systems even when training data sets are small and computational budgets limited. We conclude by briefly discussing some promising CNN-based research directions in morphological systematics opened up by the success of these techniques in providing accurate diagnostic tools.

Ort, förlag, år, upplaga, sidor
2019. Vol. 68, nr 6, s. 876-895
Nationell ämneskategori
Biologiska vetenskaper
Identifikatorer
URN: urn:nbn:se:su:diva-177512DOI: 10.1093/sysbio/syz014ISI: 000498169600002PubMedID: 30825372OAI: oai:DiVA.org:su-177512DiVA, id: diva2:1384610
Tillgänglig från: 2020-01-10 Skapad: 2020-01-10 Senast uppdaterad: 2022-03-23Bibliografiskt granskad
Ingår i avhandling
1. Automated image-based taxon identification using deep learning and citizen-science contributions
Öppna denna publikation i ny flik eller fönster >>Automated image-based taxon identification using deep learning and citizen-science contributions
2021 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The sixth mass extinction is well under way, with biodiversity disappearing at unprecedented rates in terms of species richness and biomass. At the same time, given the currentpace, we would need the next two centuries to complete the inventory of life on Earthand this is only one of the necessary steps toward monitoring and conservation of species. Clearly, there is an urgent need to accelerate the inventory and the taxonomic researchrequired to identify and describe the remaining species, a critical bottleneck. Arguably, leveraging recent technological innovations is our best chance to speed up taxonomic research. Given that taxonomy has been and still is notably visual, and the recent break-throughs in computer vision and machine learning, it seems that the time is ripe to exploreto what extent we can accelerate morphology-based taxonomy using these advances inartificial intelligence. Unfortunately, these so-called deep learning systems often requiresubstantial computational resources, large volumes of labeled training data and sophisticated technical support, which are rarely available to taxonomists. This thesis is devoted to addressing these challenges. In paper I and paper II, we focus on developing an easy-to-use (’off-the-shelf’) solution to automated image-based taxon identification, which is at the same time reliable, inexpensive, and generally applicable. This enables taxonomists to build their own automated identification systems without prohibitive investments in imaging and computation. Our proposed solution utilizes a technique called feature transfer, in which a pretrained convolutional neural network (CNN) is used to obtain image representations (”deep features”) for a taxonomic task of interest. Then, these features are used to train a simpler system, such as a linear support vector machine classifier. In paper I we optimized parameters for feature transfer on a range of challenging taxonomic tasks, from the identification of insects to higher groups --- even when they are likely to belong to subgroups that have not been seen previously --- to the identification of visually similar species that are difficult to separate for human experts. In paper II, we applied the optimal approach from paper I to a new set of tasks, including a task unsolvable by humans - separating specimens by sex from images of body parts that were not previously known to show any sexual dimorphism. Papers I and II demonstrate that off-the-shelf solutions often provide impressive identification performance while at the same time requiring minimal technical skills. In paper III, we show that phylogenetic information describing evolutionary relationships among organisms can be used to improve the performance of AI systems for taxon identification. Systems trained with phylogenetic information do as well as or better than standard systems in terms of common identification performance metrics. At the same time, the errors they make are less wrong in a biological sense, and thus more acceptable to humans. Finally, in paper IV we describe our experience from running a large-scale citizen science project organized in summer 2018, the Swedish Ladybird Project, to collect images for training automated identification systems for ladybird beetles. The project engaged more than 15,000 school children, who contributed over 5,000 images and over 15,000 hours of effort. The project demonstrates the potential of targeted citizen science efforts in collecting the required image sets for training automated taxonomic identification systems for new groups of organisms, while providing many positive educational and societal side effects.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Zoology, Stockholm University, 2021. s. 66
Nationell ämneskategori
Zoologi
Forskningsämne
zoologisk systematik och evolutionsforskning
Identifikatorer
urn:nbn:se:su:diva-189460 (URN)978-91-7911-416-9 (ISBN)978-91-7911-417-6 (ISBN)
Disputation
2021-03-10, Vivi Täckholmsalen (Q-salen), NPQ-huset, Svante Arrhenius väg 20, Stockholm, 14:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
EU, Horisont 2020, 642241
Tillgänglig från: 2021-02-15 Skapad: 2021-01-25 Senast uppdaterad: 2022-02-25Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextPubMed

Person

Valan, Miroslav

Sök vidare i DiVA

Av författaren/redaktören
Valan, Miroslav
Av organisationen
Zoologiska institutionen
I samma tidskrift
Systematic Biology
Biologiska vetenskaper

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
pubmed
urn-nbn

Altmetricpoäng

doi
pubmed
urn-nbn
Totalt: 188 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf