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Article
Publication date: 26 June 2009

Yih‐Chih Chiou, Chern‐Sheng Lin and Guan‐Zi Chen

The purpose of this paper is to present an automatic inspection method of colors and textures classification of paper and cloth objects.

Abstract

Purpose

The purpose of this paper is to present an automatic inspection method of colors and textures classification of paper and cloth objects.

Design/methodology/approach

In this system, the color image is transformed from RGB model to other suitable color model with one of the components being chosen as the gray‐level image for extracting textures. The gray‐level image is decomposed into four child images using wavelet transformation. Two child images capable of detecting variations along columns and rows are used to generate 0° and 90° co‐occurrence matrices, respectively. Some of the distinguishable texture features are derived from the two co‐occurrence matrixes. Finally, the test image is classified using neural networks. Nine color papers and eight color cloths are used to test the developed classification method.

Findings

The results show that recognition rate higher than 97.86 percent can be achieved if color and texture features are both used as the inputs to the networks.

Originality/value

The paper presents a new approach for testing materials. The multipurpose measurement application with unsophisticated and economical equipment can be confirmed in online inspection of papers and cloth manufacturing.

Details

Sensor Review, vol. 29 no. 3
Type: Research Article
ISSN: 0260-2288

Keywords

Article
Publication date: 26 January 2010

Padmapriya Nammalwar, Ovidiu Ghita and Paul F. Whelan

The purpose of this paper is to propose a generic framework based on the colour and the texture features for colour‐textured image segmentation. The framework can be applied to…

Abstract

Purpose

The purpose of this paper is to propose a generic framework based on the colour and the texture features for colour‐textured image segmentation. The framework can be applied to any real‐world applications for appropriate interpretation.

Design/methodology/approach

The framework derives the contributions of colour and texture in image segmentation. Local binary pattern and an unsupervised k‐means clustering are used to cluster pixels in the chrominance plane. An unsupervised segmentation method is adopted. A quantitative estimation of colour and texture performance in segmentation is presented. The proposed method is tested using different mosaic and natural images and other image database used in computer vision. The framework is applied to three different applications namely, Irish script on screen images, skin cancer images and sediment profile imagery to demonstrate the robustness of the framework.

Findings

The inclusion of colour and texture as distributions of regions provided a good discrimination of the colour and the texture. The results indicate that the incorporation of colour information enhanced the texture analysis techniques and the methodology proved effective and efficient.

Originality/value

The novelty lies in the development of a generic framework using both colour and texture features for image segmentation and the different applications from various fields.

Details

Sensor Review, vol. 30 no. 1
Type: Research Article
ISSN: 0260-2288

Keywords

Article
Publication date: 1 May 2011

Shahid Adeel, Ijaz A. Bhatti, K. EL-Nagar, M. Mohboob Alam and Nagia Ali

The rhizomes of Curcuma longa L. which contains curcumin, the main coloring component that imparts a yellow color onto cotton fabric, has been selected for study in this paper…

124

Abstract

The rhizomes of Curcuma longa L. which contains curcumin, the main coloring component that imparts a yellow color onto cotton fabric, has been selected for study in this paper. The extracts are obtained by using different concentrations of irradiated turmeric powder. In order to improve colour fastness properties, pre and post- mordanting are applied by using alum and iron as mordants. The dyed samples are subjected to a CIE Lab system with a spectra flash spectrophotometer for the evaluation of L* (lighter/darker), a* (redder/greener) and b* (yellower/bluer) values.

Finally, ISO standard methods are employed to study colour fastness to light, washing and rubbing (dry and wet) in order to observe the influence of UV radiation on the dyeing behaviour of turmeric. It is observed that UV radiation not only enhances the color strength of dye on irradiated cotton fabric using low concentrations of dye, but also improves the color fastness properties of pre-irradiated cotton fabric by using pre-irradiated turmeric powder with a low concentration of mordant.

Details

Research Journal of Textile and Apparel, vol. 15 no. 2
Type: Research Article
ISSN: 1560-6074

Keywords

Article
Publication date: 1 May 2012

Ijaz A. Bhatti, Shahid Adeel, Safia Rani, Tahsin Gulzar, Saima Naz and H.F. Mansour

The efficiency of UV radiation on boiled aqueous and alkaline extracts of Eucalyptus bark powder has been determined. Irradiated and un-irradiated cotton fabrics were used to…

Abstract

The efficiency of UV radiation on boiled aqueous and alkaline extracts of Eucalyptus bark powder has been determined. Irradiated and un-irradiated cotton fabrics were used to study the dyeing parameters such as material-liquor ratio, dyeing time and dyeing pH. Pre- and postmordanting were carried out by using copper and iron mordants. The data colour report was obtained for evaluation of un-irradiated and irradiated dyed cotton using a Spectra Flash (SF- 650) in the CIE Lab system. It was found that UV irradiation has the potential to improve dyeing and fastness properties, such as washing, light and rubbing, of cotton dyed with Eucalyptus bark powder.

Details

Research Journal of Textile and Apparel, vol. 16 no. 2
Type: Research Article
ISSN: 1560-6074

Keywords

Article
Publication date: 1 May 2010

Sajida Perveen, Ijaz Ahmad Bhatti and Shahid Adeel

Pomegranate (Punica granatum), which contains tannins as the main colouring component in the rind that imparts a yellowish brown colour on cotton fabric, has been selected and…

Abstract

Pomegranate (Punica granatum), which contains tannins as the main colouring component in the rind that imparts a yellowish brown colour on cotton fabric, has been selected and extracted through the use of water, methanol and ethanol. For the extraction of dye, irradiated and non-irradiated rind powders are used. The dyeing parameters, such as temperature, pH, time and material to liquid ratio (M:L) has been studied by the CIE Lab system for the optimization of dyeing conditions. Dyeing, irradiated and non-irradiated cotton fabrics have been used in order to see the effect of UV radiation on the colour strength of dye. Fastness properties, such as colour fastness to light, washing and rubbing (dry and wet), have been studied in accordance to ISO standard methods. It is found that irradiated cotton fabric not only improves the colour strength of dye, but also the colour fastness properties of irradiated cotton fabric.

Details

Research Journal of Textile and Apparel, vol. 14 no. 2
Type: Research Article
ISSN: 1560-6074

Keywords

Article
Publication date: 21 July 2022

Rehab El-Gamal, Khaled El-Nagar, Nagwa A. Tharwat and Gomaa Abdel-Maksoud

This study aims to use whiteness (WI) and yellowness indices (YI) that were calculated from the International Commission on Illumination (CIE) color parameter to evaluate the…

Abstract

Purpose

This study aims to use whiteness (WI) and yellowness indices (YI) that were calculated from the International Commission on Illumination (CIE) color parameter to evaluate the efficiency of some triazole fungicides [propiconazole (C15H17Cl2N3O2) and tebuconazole (C16H22ClN3O)] to protect wooden artifacts from fungal deterioration.

Design/methodology/approach

Archeological wooden samples were collected from some historical Islamic buildings in Cairo, Egypt. Three species of fungi were identified in previous work. Propiconazole and tebuconazole with different concentrations treated the infected wooden samples aged for different periods. WI and YI of studied samples were measured using UV spectrophotometer. Calibration and uncertainty estimation accompanied by color measurement were studied.

Findings

Studying the uncertainty sources of diffuse reflection of the standard white tiles revealed that the uncertainty of calibration for both the spectrophotometer and white tiles had the highest contribution. The treated samples with tebuconazole and propiconazole fungicides gave good resistance against fungal deterioration at 0.50% for WI and YI.

Originality/value

This study presents the importance of colorimetry in the conservation field because they are considered one of the most important criteria to evaluate conservation materials. From color measurements and their uncertainties, it became clear that triazole fungicides have good efficiency in the protection of wooden artifacts from fungal deterioration. The value of this study is that propiconazole and tebuconazole fungicides at 0.50% can be applied to archaeological wood that is endangered to improper conditions, especially in the case of high levels of relative humidity.

Details

Pigment & Resin Technology, vol. 53 no. 1
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 9 May 2019

Z.H.Z. Abidin, N.S.A. Manah, A.N. Hadi, N.S. Saugi, F.A. Fuad, N.A. Mazni, H.C. Hassan, M.A. Careem and A.K. Arof

This paper aims to focus on a comparison study of the visible stability of natural blue dye consisting anthocyanin molecules extracted from Clitoria ternatea in coating films.

Abstract

Purpose

This paper aims to focus on a comparison study of the visible stability of natural blue dye consisting anthocyanin molecules extracted from Clitoria ternatea in coating films.

Design/methodology/approach

The coating films were prepared by mixing the blue dye with poly(acrylamide-co-acrylic acid) in three different weight ratios. Samples were coded as 10PBA, 15PBA and 20PBA, where PBA is the abbreviation for poly acrylamide-co-acrylic acid, blue dyes and anthocyanin. The number at the beginning of each code represents the weight percentage of poly(acrylamide-co-acrylic acid) to natural blue dye. The mixtures were applied on separate glass substrates to form coating films. Another set of samples were prepared for the comparison study with a commercial acrylic clear coat (cc) applied on the surface of the 10PBA, 15PBA and 20PBA coating films. These coating films were coded 10PBAcc, 15PBAcc and 20PBAcc. The purpose of the clear coat is to observe how it affects the colour stability of the blue coating films with respect to time. All samples were exposed to the ultraviolet (UV) source, an 18 W Philips TL-D 18w/830 UV fluorescent lamp. The UV lamp was placed 15 cm above the surface of the samples for 35 days. The colour of the coatings was measured using CIE L*a*b* colour space coordinate.

Findings

The results obtained show 10PBA and 10PBAcc have the highest colour stability after 35 days of exposure to UV light. The reflectivity of the coating films was also measured during exposure to UV lamp. Reflectivity measurements also showed that 10PBA and 10PBAcc coating films had the highest reflective stabilities.

Research limitations/implications

The potential of using natural blue dye consisting anthocyanin in coating film to obtain high colour stability.

Practical implications

The coating film developed in this work is suitable to be applied on glass substrates.

Originality/value

The application of anthocyanin dye extracted from the Clitoria ternatea L. as a colourant in coating films

Details

Pigment & Resin Technology, vol. 48 no. 4
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 5 December 2017

Yuliang Zhou, Mingxuan Chen, Guanglong Du, Ping Zhang and Xin Liu

The aim of this paper is to propose a grasping method based on intelligent perception for implementing a grasp task with human conduct.

Abstract

Purpose

The aim of this paper is to propose a grasping method based on intelligent perception for implementing a grasp task with human conduct.

Design/methodology/approach

First, the authors leverage Kinect to collect the environment information including both image and voice. The target object is located and segmented by gesture recognition and speech analysis and finally grasped through path teaching. To obtain the posture of the human gesture accurately, the authors use the Kalman filtering (KF) algorithm to calibrate the posture use the Gaussian mixture model (GMM) for human motion modeling, and then use Gaussian mixed regression (GMR) to predict human motion posture.

Findings

In the point-cloud information, many of which are useless, the authors combined human’s gesture to remove irrelevant objects in the environment as much as possible, which can help to reduce the computation while dividing and recognizing objects; at the same time to reduce the computation, the authors used the sampling algorithm based on the voxel grid.

Originality/value

The authors used the down-sampling algorithm, kd-tree algorithm and viewpoint feature histogram algorithm to remove the impact of unrelated objects and to get a better grasp of the state.

Details

Industrial Robot: An International Journal, vol. 45 no. 1
Type: Research Article
ISSN: 0143-991X

Keywords

Article
Publication date: 5 January 2023

Jundong He and Xinguang Lv

The purpose of this study is to modify the FDM 3D printer to print with polystyrene (PS) microspheres as the printing material, thus enabling bottom-up structural color printing…

Abstract

Purpose

The purpose of this study is to modify the FDM 3D printer to print with polystyrene (PS) microspheres as the printing material, thus enabling bottom-up structural color printing and evaluating structural color printing.

Design/methodology/approach

This study chose a range of different heated bed temperatures to determine a suitable temperature for accelerating the self-assembly of photonic crystals and printing structural colors on various substrates. In addition, this study enhanced the structural color by doping PS microspheres with different contents of Acid Black 210 dye and evaluated the color-enhanced structural color by eye and spectrophotometer under different light sources.

Findings

The results show that the modified 3D printer can be used for structural color printing, and 50°C is determined as the heated bed temperature. There are significant differences in structural colors when printing under different color backgrounds and material substrates, and corresponding suitable substrates should be selected according to the application. The doping of PS microspheres with varying contents of dye results in different color levels of structural color. As with pigment colors, the visual perception of structural color varies when viewed under different light sources.

Originality/value

This paper proposes to print structural colors low-costly, analyze structural colors under substrate and light source conditions, and expand the structural color gamut by enhancing structural colors, which has positive implications for further research on structural colors as printing colors.

Details

Pigment & Resin Technology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 1 June 1988

A colour measurement system is available from Philips Analytical, based on one of the world's finest high‐performance ultraviolet/visible spectrophotometer series — the PU8800.

Abstract

A colour measurement system is available from Philips Analytical, based on one of the world's finest high‐performance ultraviolet/visible spectrophotometer series — the PU8800.

Details

Pigment & Resin Technology, vol. 17 no. 6
Type: Research Article
ISSN: 0369-9420

1 – 10 of 408