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Articles by Hassan Basri
Total Records ( 2 ) for Hassan Basri
  Edgar Scavino , Dzuraidah Abdul Wahab , Hassan Basri , Mohd Marzuki Mustafa and Aini Hussain
  Problem statement: Segmentation is the first and fundamental step in the process of computer vision and object classification. However, complicate or similar colour pattern add complexity to the segmentation of touching objects. The objective of this study was to develop a robust technique for the automatic segmentation and classification of touching plastic bottles, whose features were previously stored in a database. Approach: Our technique was based on the possibility to separate the two objects by means of a segment of straight line, whose position was determined by a genetic approach. The initial population of the genetic algorithm was heuristically determined among a large set of cutting lines, while further generations were selected based on the likelihood of the two objects with the images stored in the database. Results: Extensive testing, which was performed on random couples out of a population of 50 bottles, showed that the correct segmentation could be achieved in success rates above 90% with only a limited number of both chromosomes and iterations, thus reducing the computing time. Conclusion: These findings proved the effectiveness of our method as far as touching plastic bottles are concerned. This technique, being absolutely general, can be extended to any situation in which the properties of single objects were previously stored in a database.
  Harmin Sulistiyaning Titah , Siti Rozaimah Sheikh Abdullah , Mushrifah Idris , Nurina Anuar , Hassan Basri and Muhammad Mukhlisin
  Studies were conducted to determine the range of arsenic concentration through a phytotoxicity test on the plant species of Ludwigia octovalvis. Pots contained 3 kg of sand spiked with As salt of sodium arsenate dibasic heptahydrate. Arsenate [As(V)] concentrations were set as 0 mg kg-1 as control 1 without plant, 0 mg kg-1 as control 2 with plant, 4, 20, 40, 60 and 80 mg kg-1. The experiment was carried out for 28 days. The parameters such as pH and temperature in spiked sand were also monitored. The As bioavailability in spiked sand was extracted using Na2-EDTA method and were determined using Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES) Optima 7300DV. Based on the range finding test results, L. octovalvis can survive up to As(V) concentration of 40 mg kg-1, whereas the plant were wilted and dried at 60 and 80 mg kg-1. The EC50 value for single As(V) phytotoxicity to L. octovalvis was predicted between 40 and 60 mg As kg-1. Reductions of As(V) bioavailability in spiked sands were calculated as between 13.0±3.3 and 70.4±0.1%. Hence, the next step experiment on a prolonged phytotoxicity test will be based on the value of this As(V) concentration effect.
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