Development of an On-line Image Analysis for Assessment of Pyrite Liberation. Final Technical Report, 1 September, 1992--31 August, 1993 PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 31
Book Description
The degree of pyrite liberation is a key to determine whether a batch of ground coal obtained through a grinding process is acceptable. Currently, the liberation analysis is conducted manually through a microscope with a commercial image analysis software. This procedure is very labor intensive and time consuming. As a result, an automation procedure based on the principles of image processing is proposed to perform the analysis of pyrite/minerals liberation of coal. To make the automated image analysis system possible, a data base of the light reflectance characteristics of different coal constituents must be established and implemented into a computer program. Characterization of coal images through the analysis of histograms has been conducted. To be specific, this research effort, during the past one year, has led to (1) the development of the flowchart of an on-line automated image analysis system, (2) the construction of an X-Y stage and the corresponding controlling software, (3) the development of rule based criteria from the image characteristics of coal particles, (4) the development of an image analysis computer software for analyzing coal particles without any human operator's intervention. The initial verification of this program has indicated that the automated image analysis process has met the proposed objectives.
Author: Publisher: ISBN: Category : Languages : en Pages : 31
Book Description
The degree of pyrite liberation is a key to determine whether a batch of ground coal obtained through a grinding process is acceptable. Currently, the liberation analysis is conducted manually through a microscope with a commercial image analysis software. This procedure is very labor intensive and time consuming. As a result, an automation procedure based on the principles of image processing is proposed to perform the analysis of pyrite/minerals liberation of coal. To make the automated image analysis system possible, a data base of the light reflectance characteristics of different coal constituents must be established and implemented into a computer program. Characterization of coal images through the analysis of histograms has been conducted. To be specific, this research effort, during the past one year, has led to (1) the development of the flowchart of an on-line automated image analysis system, (2) the construction of an X-Y stage and the corresponding controlling software, (3) the development of rule based criteria from the image characteristics of coal particles, (4) the development of an image analysis computer software for analyzing coal particles without any human operator's intervention. The initial verification of this program has indicated that the automated image analysis process has met the proposed objectives.
Author: Publisher: ISBN: Category : Languages : en Pages : 24
Book Description
An automation procedure based on the principles of image processing is proposed to perform the analysis of pyrite/minerals liberation of coal. To make the automated image analysis system possible, a data base of the light reflectance characteristics of different coal constituents must be established. Characterization of coal images through the analysis of their histogram was conducted. In general, it was found that the distinction of coal particles or particle groups may be accomplished by determining the gray levels of zero pixel or by taking average gray level of each particle. In particular, when the gray level averaging is applied, the spread of gray levels of a given maceral becomes smaller. In other words, the spread in gray level among different maceral group becomes larger. This has led to a distinct boundary between different material group of coal. Two computer programs based on these findings are being developed. The implementation of these criteria will cover most of the coal samples that are previously analyzed. Consideration of special cases will require additional data analysis of histogram.
Author: Publisher: ISBN: Category : Languages : en Pages : 16
Book Description
A technique has been developed for generating scanning electron microscope images of sections of polished coal and coal particles that are suitable for the measurement of the linear intercept distribution functions and the distribution of three-phase linear grades. The three phases used are; pyrite, ash forming minerals, and coal. The phase-to-phase transition probabilities for the unbroken ore can also be estimated using conventional image analysis techniques. The distribution of linear intercept lengths through the pyrite, ash and coal phases were found to be described by sums of 2, 3 and 4 exponentials respectively. This reflects the presence of distinct textural regions in the coal. The linear grade distributions were determined in 710 - 1000 micron coal particles that had previously been carefully fractionated using dense liquids. The three phase linear grade distributions reflect the variation in particle composition that results from the fractionation and they provide a detailed picture of the three-phase composition of the various fractions. It is not yet possible to stereologically correct these three-phase distributions. However, the measured uncorrected distributions are very encouraging and a viable stereological correction procedure will be developed during the next phase of work on this project.
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Author: S. C. Max Yen
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Author: Illinois Clean Coal Institute
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Author: Bruce D. Rodely
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