Journal of Engineering, Project, and Production Management, 2012, 2(2), 57-65
Determination of Optimum Frame Rates for Observation of Construction Operations from Time-Lapse Movies
Y. M. Ibrahim1 , A. D. Ibrahim2, and P. G. Chindo3
1Senior Lecturer, Department of Quantity Surveying, Ahmadu Bello University, Zaria, Nigeria, E-mail: makarfi@gmail.com (corresponding author).
2Senior Lecturer, Department of Quantity Surveying, Ahmadu Bello University, Zaria, Nigeria, E-mail: adibrahim2@yahoo.com
3Lecturer, Department of Quantity Surveying, Ahmadu Bello University, Zaria, Nigeria, E-mail: pcgangas@yahoo.com
Project Management
Received November 20, 2011; received revisions January 3, 2012; January 13, 2012; accepted January 17, 2012
Available online March 5, 2012
Abstract: Construction professionals have been using time-lapse movies in monitoring construction operations. However, some amount of detail is always lost in the interval between two consecutive frames in a time-lapse movie. This poses the question: By how much can the frame rate be lowered from the standard 30fps (frames per second) to allow for the accurate observation of construction operations from a time-lapse movie? This paper addresses the problem by establishing the optimum frame rates for observation of activities related to mortar mixing and block handling. The activities were first recorded at the standard rate of 30fps. Using the Adobe Premier Pro video editing software, the records were then segregated into still images from which 15 different time-lapse movies of various time intervals were generated. The movies were then shown to 25 Construction Managers. A structured questionnaire was employed to capture the level of accuracy with which Construction Managers could interpret the job site situation from each movie. The results suggest that 1fpm (frame per minute) is sufficient for the accurate tracking of labourers involved in mortar mixing while 1 frame in every 20 seconds is sufficient for accurate identification of number of cement bags used. However, for tracking number of blocks off-loaded, and those damaged, 1 frame in every 2 seconds is required.
Keywords: Time-lapse movies, construction, operations, optimum, frame rate.
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Citation:
Ibrahim,
Y. M., Ibrahim, A. D.,
and Chindo,
P. G. (2012).
Determination of Optimum Frame
Rates for Observation of Construction Operations from Time-Lapse
Movies. Journal of Engineering,
Project, and Production Management, 2(2), 57-65.
DOI:
10.32738/JEPPM.201207.0002
DOI:
10.32738/JEPPM.201207.0002
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