Grayscale Image Segmentation Using Color Space

Horiuchi, Takahiko

doi:10.1093/ietisy/e89-d.3.1231

Cited by 11 publications

(12 citation statements)

References 5 publications

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“…In color segmentation of an image, the objective is to spatially separate regions based on similarities inside each region and differences among distinct regions. The way to undertake the segmentation of color varies from the empirical evaluation of various color spaces (Horiuchi, 2006), to modeling based on physical principles (Gheissari and Bab-Hadiashar, 2003). The primary Gheissari and Bab-Hadiashar, 2003).…”

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confidence: 99%

Biological Activity of Essential Oils from Leaves and Fruits of Pepper Tree (Schinus molle L.) to Control Rice Weevil (Sitophilus oryzae L.)

Benzi

Stefanazzi

Ferrero

2009

Chilean J. Agric. Res.

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Rice weevil (Sitophilus oryzae L.) is a primary insect pest of stored grain. The development of resistance resulted in the application of synthetic insecticides. In recent years many plant essential oils have provided potential alternatives to currently used insect control agents. The Brazilian pepper tree (Schinus molle L. var. areira (L.) DC.) (Anacardiaceae) ) (Anacardiaceae) has different biological properties such as insecticidal activity. In this study, repellent, fumigant activity, nutritional indices, and feeding deterrent action were evaluated on S. oryzae adults. Filter paper impregnation was used to test fumigant toxicity, whereas treated whole wheat was used to evaluate repellent activity and a flour disk bioassay was done to evaluate feeding deterrent action and nutritional index alteration. Leaf essential oils showed repellent effects at both concentrations (0.04 and 0.4% w/w), while fruit essential oils lacked repellent activity. Both plant oils altered nutritional indices. Fruit essential oils had a strong feeding deterrent action (62%) while leaves had a slight effect (40.6%). With respect to fumigant activity, neither of the essential oils was found to be toxic. Resistance and toxicity problems of the synthetic insecticides have resulted in the necessity of finding more effective and healthier alternatives. Thus, essential oils are the most tested products presently (Papachristos and Stamopoulus, 2002; Umoetok and Gerard, 2003; Zhang et al., 2004; Tapondjou et al., 2005; Ferrero et al., 2006; Sánchez Chopa et al., 2006, Stefanazzi et al., 2006, Wang et al., 2006. Different biological activities of plant derivatives have been demonstrated for the control of stored grain pests (Golob et al., 1999; Rajendran and Sriranjini, 2008).The Brazilian pepper tree (Schinus molle L. var. areira (L.) DC.) is associated with agricultural crops in boundaries, windbreaks, riverbank protection, and watershed conservation. In popular medicine, it is use for its astringent, diuretic, antispasmodic properties among others. In pest control, it is used as a fumigant, repellent, and ovicide (Ruffínengo et al., 2005; Ferrero et al., 2006).The objective of the present study was to evaluate the fumigant, repellent and/or attractant, feeding deterrent activity, and the alterations in the nutritional physiology produced by the essential oils from leaves and fruits of S. molle var. areira on 3-to 4-day-old S. oryzae adults. V. BENZI et al. -BIOLOGICAL ACTIVITY OF ESSENTIAL OILS… MATERIALS AND METHODS InsectsThe insects came from a susceptible colony maintained in the Cátedra de Zoología Agrícola de la Universidad Nacional de Buenos Aires (UBA). They were bred in glass containers, 8 cm in diameter, 13 cm high, sealed with fine netting, maintained at 28 ± 1 ºC, 60-70% HR, a 12:12 photoperiod, and using whole wheat grains as food. Vegetal materialThe vegetal organs (leaves and mature fruits) of the pepper tree were collected during the summer period in Bahía Blanca city, Buenos Aires, Argentina (38°41' S; 62°17' ...

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confidence: 99%

Biological Activity of Essential Oils from Leaves and Fruits of Pepper Tree (Schinus molle L.) to Control Rice Weevil (Sitophilus oryzae L.)

Benzi

Stefanazzi

Ferrero

2009

Chilean J. Agric. Res.

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“…The luminescence L of a pixel in RGB spaced was calculated with YIQ system [13] given by eq. (1).The luminance of a gray scale image pixel contains sufficient information to represent it into its parallel color space and provides extra viscous measures and perceivable variability within the object (local) and in the entire image (global) as shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

“…There is thus a need to explore alternate segmentation methodologies. Specifically, colorized segmentation of gray scale images may yield enhanced results compared to naked eye assessment of normal and diseased tissue based on monochrome data [13] , [14] .…”

Section: Introductionmentioning

confidence: 99%

Colorization and Automated Segmentation of Human T2 MR Brain Images for Characterization of Soft Tissues

et al. 2012

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Characterization of tissues like brain by using magnetic resonance (MR) images and colorization of the gray scale image has been reported in the literature, along with the advantages and drawbacks. Here, we present two independent methods; (i) a novel colorization method to underscore the variability in brain MR images, indicative of the underlying physical density of bio tissue, (ii) a segmentation method (both hard and soft segmentation) to characterize gray brain MR images. The segmented images are then transformed into color using the above-mentioned colorization method, yielding promising results for manual tracing. Our color transformation incorporates the voxel classification by matching the luminance of voxels of the source MR image and provided color image by measuring the distance between them. The segmentation method is based on single-phase clustering for 2D and 3D image segmentation with a new auto centroid selection method, which divides the image into three distinct regions (gray matter (GM), white matter (WM), and cerebrospinal fluid (CSF) using prior anatomical knowledge). Results have been successfully validated on human T2-weighted (T2) brain MR images. The proposed method can be potentially applied to gray-scale images from other imaging modalities, in bringing out additional diagnostic tissue information contained in the colorized image processing approach as described.

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“…The way to undertake the segmentation of color varies from the empirical evaluation of various color spaces (Horiuchi, 2006), to modeling based on physical principles (Gheissari and Bab-Hadiashar, 2003). The primary Gheissari and Bab-Hadiashar, 2003).…”

Section: Location and Classification Of Moving Fruitsmentioning

confidence: 99%

Location and Classification of Moving Fruits in Real Time with a Single Color Camera

Reyes

Chiang

2009

Chilean J. Agric. Res.

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Grayscale Image Segmentation Using Color Space

Cited by 11 publications

References 5 publications

Biological Activity of Essential Oils from Leaves and Fruits of Pepper Tree (Schinus molle L.) to Control Rice Weevil (Sitophilus oryzae L.)

Biological Activity of Essential Oils from Leaves and Fruits of Pepper Tree (Schinus molle L.) to Control Rice Weevil (Sitophilus oryzae L.)

Colorization and Automated Segmentation of Human T2 MR Brain Images for Characterization of Soft Tissues

Location and Classification of Moving Fruits in Real Time with a Single Color Camera

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