Automatic leaf segmentation and overlapping leaf separation using stereo vision

Article


Mohammed Amean, Zainab, Low, Tobias and Hancock, Nigel. 2021. "Automatic leaf segmentation and overlapping leaf separation using stereo vision." Array. 12, pp. 1-17. https://doi.org/10.1016/j.array.2021.100099
Article Title

Automatic leaf segmentation and overlapping leaf separation using stereo vision

Article CategoryArticle
AuthorsMohammed Amean, Zainab (Author), Low, Tobias (Author) and Hancock, Nigel (Author)
Journal TitleArray
Journal Citation12, pp. 1-17
Article Number100099
Number of Pages17
Year2021
Place of PublicationNetherlands
Digital Object Identifier (DOI)https://doi.org/10.1016/j.array.2021.100099
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S2590005621000436?dgcid=rss_sd_all
Abstract

Farm management and crop quality assessment is becoming increasingly automated to keep up with demand. The physical examination of the plant leaves, stems and fruit can provide valuable information about a plant’s health. Automating the visual inspection through machine vision spawns challenges such as occlusions, irregular lightning and varying environmental conditions. In this paper, a plant leaf extraction algorithm utilising depth from a stereo vision sensor is presented. The algorithm tackles multiple leaf segmentation and overlapping leaf separation through synergising features such as colour, shape and depth. Depth is particularly used to measure discontinuities along its gradient in the disparity maps. The algorithm has a segmentation rate of 78% for individual plant leaves, over a range of complex backgrounds and changing plant canopies. The proposed algorithm was evaluated using 272 cotton and hibiscus plant images with results demonstrating that depth properties were effective in separating occluded and overlapping leaves, with a high separation rate of 84%. Leaf occlusion could be detected automatically without adding any artificial tags on the leaf boundaries. Furthermore, the results show a nearly identical performance for both types of plants (cotton and hibiscus) under various lighting and environmental conditions. The developed algorithm could be potentially applied to other types of plants that have similar structures to cotton and hibiscus.

Keywordsmachine vision, stereo vision, depth segmentation, crop monitoring, leaves detection, overlapping leaves
ANZSRC Field of Research 2020400906. Electronic sensors
Byline AffiliationsSchool of Mechanical and Electrical Engineering
Institution of OriginUniversity of Southern Queensland
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Brink, Gavin, Wandel, Andrew P., Pittaway, Pam, Hancock, Nigel and Pather, Selvan. 2010. "Determining operational requirements to optimise monolayer performance on a farm dam via a 'Universal Design Framework'." Montagu, Kelvin (ed.) Australian Irrigation Conference and Exibition 2010: One Water Many Futures. Sydney, Australia 08 - 10 Jun 2010 Sydney, Australia.
A ‘universal design framework’ for installation planning and operational management of evaporation-suppressing films on agricultural reservoirs
Brink, Gavin, Wandel, Andrew P., Pittaway, Pam, Hancock, Nigel and Pather, Selvan. 2010. "A ‘universal design framework’ for installation planning and operational management of evaporation-suppressing films on agricultural reservoirs." Genet, Roger (ed.) International Conference on Agricultural Engineering: Towards Environmental Technologies (2010). Clermont-Ferrand, France 06 - 08 Sep 2010
Holistic control system design for large mobile irrigation machines
McCarthy, Alison, Hancock, Nigel and Raine, Steven. 2010. "Holistic control system design for large mobile irrigation machines." 16th Annual Conference on Mechatronics and Machine Vision in Practice (M2VIP 2010). Darussalam, Brunei 22 - 24 Jun 2010 Toowoomba, Australia.
EvapCalc – a modest-cost technique for real-time measurement of evaporation (and seepage) from farm dams
Hancock, Nigel and Symes, Troy. 2009. "EvapCalc – a modest-cost technique for real-time measurement of evaporation (and seepage) from farm dams." IWER 2009: International Workshop on Evaporation from Reservoirs. Gold Coast, Australia 09 - 11 Dec 2009 Gold Coast, Australia.
The combined use of shade-cloth covers and monolayers to prevent evaporation in irrigation reservoirs
Gallego-Elvira, B., Martinez Alvarez, V., Pittaway, Pam, Symes, Troy and Hancock, Nigel. 2010. "The combined use of shade-cloth covers and monolayers to prevent evaporation in irrigation reservoirs." International Conference on Agricultural Engineering: Towards Environmental Technologies (2010). Clermont-Ferrand, France 06 - 08 Sep 2010
Towards a biophysical understanding of observed performance of evaporation suppressant films applied to agricultural water storages - first analyses
Hancock, Nigel, Pittaway, Pam and Symes, Troy. 2009. "Towards a biophysical understanding of observed performance of evaporation suppressant films applied to agricultural water storages - first analyses ." Banhazi, T. M. and Saunders, C. (ed.) SEAg 2009: Agricultural Technologies In a Changing Climate. Brisbane, Australia 13 - 16 Sep 2009 Brisbane, Australia.
Smart monolayer application and management to reduce evaporation on farm dams - formulation of a universal design framework
Brink, Gavin, Symes, Troy, Pittaway, Pam, Hancock, Nigel, Pather, Selvan and Schmidt, Erik. 2009. "Smart monolayer application and management to reduce evaporation on farm dams - formulation of a universal design framework." Venkatraman, K. (ed.) 2009 Environmental Research Event. Noosa, Australia 10 - 13 May 2009
Towards adaptive operational requirements for optimal application of evaporation-suppressing monolayer to reservoirs via a 'universal design framework'
Brink, Gavin, Wandel, Andrew P., Hancock, Nigel and Pather, Selvan. 2009. "Towards adaptive operational requirements for optimal application of evaporation-suppressing monolayer to reservoirs via a 'universal design framework'." IWER 2009: International Workshop on Evaporation from Reservoirs. Gold Coast, Australia 09 - 11 Dec 2009 Gold Coast, Australia.
A preliminary field evaluation of an automated vision-based plant geometry measurement system
McCarthy, Cheryl, Hancock, Nigel and Raine, Steven R.. 2007. "A preliminary field evaluation of an automated vision-based plant geometry measurement system." Prusinkiewicz, Przemyslaw, Hanan, Jim S. and Lane, Brendan (ed.) 5th International Workshop on Functional Structural Plant Models (FSPM07). Napier, New Zealand 04 - 09 Nov 2007
Improving the performance of chemical monolayers in reducing farm dam evaporation
Craig, Ian, Schmidt, Erik, Hancock, Nigel, Barnes, Geoff, Turnbull, David J., Pittaway, Pam and Morrison, Pippa. 2006. "Improving the performance of chemical monolayers in reducing farm dam evaporation." 3rd CRC-IF Annual Research Forum. Narrabri, Australia 05 - 06 Dec 2006 Toowoomba, Queensland.
Development of a 'smart' monolayer application system for reducing evaporation from farm dams: introductory paper
Brink, Gavin, Symes, Troy and Hancock, Nigel. 2009. "Development of a 'smart' monolayer application system for reducing evaporation from farm dams: introductory paper." Banhazi, T. M. and Saunders, C. (ed.) SEAg 2009: Agricultural Technologies In a Changing Climate. Brisbane, Australia 13 - 16 Sep 2009 Brisbane, Australia.
EvapCalc software for the determination of dam evaporation and seepage
Craig, Ian, Schmidt, Erik and Hancock, Nigel. 2007. "EvapCalc software for the determination of dam evaporation and seepage." Banhazi, T. M. and Saunders, C. (ed.) SEAg 2007: Agriculture and Engineering - Challenge Today, Technology Tomorrow. Adelaide, Australia 24 - 26 Sep 2007 Adelaide, Australia.
Automated machine vision sensing of plant structural parameters
McCarthy, C. L., Hancock, Nigel and Raine, Steven R.. 2007. "Automated machine vision sensing of plant structural parameters." Biological Sensorics 2007: Critical Technologies for Future Biosystems. Minneapolis, Australia 15 - 17 Jun 2007 St. Joseph, MI, United States.
Development of a simulation framework for variable-rate irrigation of cotton
McCarthy, Alison, Hancock, Nigel and Raine, Steven R.. 2008. "Development of a simulation framework for variable-rate irrigation of cotton." 14th Australian Cotton Conference: New Beginnings – Cotton in a Climate of Change. Gold Coast, Australia 12 - 14 Aug 2008 Narrabri, NSW, Australia.
Managing spatial and temporal variability in irrigated agriculture through adaptive control
Smith, R. J., Raine, Steven R., McCarthy, Alison and Hancock, Nigel. 2009. "Managing spatial and temporal variability in irrigated agriculture through adaptive control." Australian Journal of Multi-Disciplinary Engineering. 7 (1), pp. 79-90.
Exploration of data requirements for adaptive control of irrigation scheduling
McCarthy, Alison, Hancock, Nigel and Raine, Steven R.. 2009. "Exploration of data requirements for adaptive control of irrigation scheduling." Banhazi, T. M. and Saunders, C. (ed.) SEAg 2009: Agricultural Technologies In a Changing Climate. Brisbane, Australia 13 - 16 Sep 2009 Brisbane, Australia.
Sensors in, for and by mechatronics: a symbiosis [Introduction]
Hancock, Nigel H.. 2000. "Sensors in, for and by mechatronics: a symbiosis [Introduction]." Billingsley, John (ed.) Mechatronics and machine vision. Baldock, United Kingdom. Research Studies Press. pp. 101-103
Automated carbon dioxide measurement via miniaturised chemical reaction chambers under mechatronic control
Maxwell, Andrew, Hancock, Nigel and Tran-Cong, Thanh. 2000. "Automated carbon dioxide measurement via miniaturised chemical reaction chambers under mechatronic control." Billingsley, John (ed.) Mechatronics and machine vision. Baldock, United Kingdom. Research Studies Press. pp. 135-142
Towards evaluation of adaptive control systems for improved site-specific irrigation of cotton
McCarthy, Alison, Hancock, Nigel and Raine, Steven R.. 2008. "Towards evaluation of adaptive control systems for improved site-specific irrigation of cotton." Irrigation Australia 2008: Irrigation Association of Australia National Conference and Exhibition: Share the Water, Share the Benefits. Melbourne, Australia 20 - 22 May 2008 Hornsby, NSW, Australia.
Managing spatial and temporal variability in irrigated agriculture through adaptive control
Smith, R. J., Raine, Steven R., McCarthy, Alison and Hancock, Nigel. 2007. "Managing spatial and temporal variability in irrigated agriculture through adaptive control." Banhazi, T. M. and Saunders, C. (ed.) SEAg 2007: Agriculture and Engineering - Challenge Today, Technology Tomorrow. Adelaide, Australia 24 - 26 Sep 2007 Australia.
Evaporation, seepage and water quality management in storage dams: a review of research methods
Craig, Ian, Aravinthan, Vasantha, Baillie, Craig Peter, Beswick, Alan, Barnes, Geoff, Bradbury, Ron, Connell, Luke, Cooper, Paul, Fellows, Christopher, Fitzmaurice, Li, Foley, Joseph P., Hancock, Nigel, Lamb, David, Morrison, Pippa, Mossad, Ruth, Misra, R. K., Pittaway, Pam, Prime, Emma, Rees, Steve, ..., Turnbull, David. 2007. "Evaporation, seepage and water quality management in storage dams: a review of research methods." Environmental Health. 7 (3), pp. 84-97.
Non-contact extrudate profilometer: introductory paper
Taylor, Reginald, Hancock, Nigel and Tran-Cong, Thanh. 1997. "Non-contact extrudate profilometer: introductory paper." Werner, B. (ed.) 4th Annual Conference on Mechatronics and Machine Vision in Practice (MViP 1997). Toowoomba, Australia 23 - 25 Sep 1997 USA. https://doi.org/10.1109/MMVIP.1997.625315
Carbon dioxide sensing - a mechatronic approach
Maxwell, Andrew, Hancock, Nigel and Billingsley, John. 1997. "Carbon dioxide sensing - a mechatronic approach." Werner, B. (ed.) 4th Annual Conference on Mechatronics and Machine Vision in Practice (MViP 1997). Toowoomba, Australia 23 - 25 Sep 1997 Los Alamitos, CA. United States. https://doi.org/10.1109/MMVIP.1997.625292
Methods for assessing dam evaporation - an introductory paper
Craig, Ian and Hancock, Nigel. 2004. "Methods for assessing dam evaporation - an introductory paper." Burnett, Jolyon (ed.) Irrigation Australia 2004: Irrigation Association of Australia National Conference and Exhibition. Adelaide, Australia 11 - 13 May 2004 Hornsby, NSW, Australia.
On-the-go machine vision sensing of cotton plant geometric parameters: first results
McCarthy, Cheryl, Hancock, Nigel and Raine, Steven R.. 2006. "On-the-go machine vision sensing of cotton plant geometric parameters: first results." Billingsley, John (ed.) 13th Annual Conference on Mechatronics and Machine Vision in Practice. (M2VIP 2006). Toowoomba, Australia 05 - 07 Dec 2006 Berlin, Heidelberg.
A preliminary evaluation of machine vision sensing of cotton nodes for automated irrigation control
McCarthy, Cheryl, Hancock, Nigel and Raine, Steven R.. 2006. "A preliminary evaluation of machine vision sensing of cotton nodes for automated irrigation control." Irrigation Australia 2006: Irrigation Association of Australia National Conference and Exhibition. Brisbane, Australia 09 - 11 May 2006 Brisbane.
Development of a CFD based dam evaporation model
Craig, I. P., Mossad, R. and Hancock, N.. 2006. "Development of a CFD based dam evaporation model." 11th International Health Summer School. Brisbane, Australia 21 - 22 Nov 2006 Brisbane, Queensland.
Universal acidity - conductivity relations in commercial bulk starter production
Hancock, N. H., McKinnon, I. and Maxwell, A. D.. 2006. "Universal acidity - conductivity relations in commercial bulk starter production." Australian Journal of Dairy Technology. 61 (2), pp. 189-192.
A scoping study on measuring and monitoring tools and technology for precision irrigation
Misra, R. K., Raine, Steven R., Pezzaniti, David, Charlesworth, Philip and Hancock, Nigel. 2005. A scoping study on measuring and monitoring tools and technology for precision irrigation . Toowoomba, Australia. CRC for Irrigation Futures.