An image analysis system for determining densitometric and ring-width time series

1991 ◽  
Vol 21 (10) ◽  
pp. 1544-1549 ◽  
Author(s):  
Roy D. Thetford ◽  
Rosanne D. D'Arrigo ◽  
Gordon C. Jacoby
Keyword(s):  
Time Series ◽  
Image Analysis ◽  
Tree Ring ◽  
Ring Width ◽  
Analysis Data ◽  
Image Analysis System ◽  
Analysis Method ◽  
Image Analysis Method ◽  
Angle Variation ◽  
Analysis System

A new interactive image analysis method for determining tree-ring density and width data for dendrochronological studies is described. The method employs the Prism Image Analysis System (from Dapple Systems, Inc.) for Apple Macintosh microcomputers and uses additional FORTRAN software (program MACDRUID) developed for tree-ring applications. The principal advantages of this system are (i) interactive image analysis, which substitutes computer software for the complex scanning densitometer operations used in previous systems and (ii) high resolution, which is necessary for processing the narrow-ringed, stressed trees often sampled in dendroclimatology. Other advantages are real-time editing, ease of adjustment for angle variation of ring boundaries, and the ability to append individual frame data into homogeneous time series. Comparisons of ring-width and density data determined by this image analysis system with similar measurements derived from other methods indicate that the image analysis data are of equal precision and quality for use in dendrochronological studies. In addition to applications in the fields of dendrochronology and wood science, this image analysis method is applicable for analyzing variations in cyclical banding in other types of geological samples, such as sediment laminae (e.g., varves) and corals.

scholarly journals Fibre length by electronic image analysis

1992 ◽  
Vol 11 ◽  
pp. 1-30
Author(s):  
Torsten Hoelstad
Keyword(s):  
Image Analysis ◽  
Fibre Length ◽  
Image Analysis System ◽  
Analysis Method ◽  
Analysis Techniques ◽  
Glass Fibres ◽  
Analysis System ◽  
Image Analysis Techniques ◽  
Glycerol Jelly ◽  
Fibre Preparation

A number of electronic image analysis techniques have been applied to preparations of glass fibres obtained from polymer based composites (PES and PPS matrix) in order to automate length measurements. The image analysis sequence developed is described in detail. The functions of the sequence are based mainly on aspects of filtering in the spatial domain by means of convolution, mathematical morphology and conditional measuring. The key image analysis function is directional erosion. Using glycerol jelly strew preparations and transmitted light, the length of 500 glass fibres can be automatically measured in approximately 15 minutes with an array processor-based image analysis system (IBAS 2). The image analysis method is tolerant of impurities and variations in fibre preparation density; the method produces consistent results and errors due to misinterpretation are negligible.

Impact of spruce budworm defoliation on the number of latewood tracheids in balsam fir and black spruce

1995 ◽  
Vol 25 (12) ◽  
pp. 2029-2034 ◽  
Author(s):  
Cornelia Krause ◽  
Hubert Morin
Keyword(s):  
Tree Ring ◽  
Black Spruce ◽  
Ring Width ◽  
Spruce Budworm ◽  
The Other ◽  
Stem Length ◽  
Image Analysis System ◽  
Tree Ring Width ◽  
Analysis System

The influence of spruce budworrn (Choristoneurafumiferana (Clem.)) defoliation was analysed at different stem heights by counting the number of latewood tracheids and measuring tree-ring width. The total height of the tree was divided into three different equal parts: the lower, the middle, and the upper sections of the total stem length. However, only the results of the lower and the upper sections will be presented in this paper. The reduction of ring widths started in the upper part for the living crown and continued downwards to the stem base (0 m) with a delay of 1–2 years. The number of latewood tracheids generally showed a reduction 1 year earlier than the ring widths, particularly in the crown, but also in the other parts of the stem. Considering this, we think that the reduction of the number of latewood tracheids may date the beginning of spruce budworm defoliation more accurately and present a better characterization of the first impact of spruce budworm than the measuring of the ring widths. This parameter will be particularly helpful (when expensive equipment, such as a densitometer or an image analysis system cannot be used) in detecting past outbreaks in the tree-ring records, especially when defoliation records are missing and when the reduction of the ring widths is not very pronounced.

Chemical Classification and Particle Sizing of Foundry Sands

1985 ◽  
Vol 43 ◽  
pp. 388-389
Author(s):  
D.S. DeMiglio
Keyword(s):  
Image Analysis ◽  
Energy Dispersive Spectrometer ◽  
Image Analysis System ◽  
Representative Sampling ◽  
Foundry Sands ◽  
Large Atomic Number ◽  
Backscattered Electron ◽  
Sand Particles ◽  
Analysis System ◽  
Reclamation System

Much progress has been made in recent years towards the development of closed-loop foundry sand reclamation systems. However, virtually all work to date has determined the effectiveness of these systems to remove surface clay and metal oxide scales by a qualitative inspection of a representative sampling of sand particles. In this investigation, particles from a series of foundry sands were sized and chemically classified by a Lemont image analysis system (which was interfaced with an SEM and an X-ray energy dispersive spectrometer) in order to statistically document the effectiveness of a reclamation system developed by The Pangborn Company - a subsidiary of SOHIO.The following samples were submitted: unreclaimed sand; calcined sand; calcined & mechanically scrubbed sand and unused sand. Prior to analysis, each sample was sprinkled onto a carbon mount and coated with an evaporated film of carbon. A backscattered electron photomicrograph of a field of scale-covered particles is shown in Figure 1. Due to a large atomic number difference between sand particles and the carbon mount, the backscattered electron signal was used for image analysis since it had a uniform contrast over the shape of each particle.

SIGN IN Welcome!Log into your account your username your password Forgot your password Privacy policy PASSWORD RECOVERY Recover your password your email Struktol Home New fast measuring method for process optimization of sucrose crystallization New fast measuring method for process optimization of sucrose crystallization

2020 ◽  
pp. 49-52
Author(s):  
Trine Aabo Andersen
Keyword(s):  
Image Analysis ◽  
Process Optimization ◽  
Crystal Size ◽  
Measuring Method ◽  
Sieve Analysis ◽  
Image Analysis System ◽  
Line System ◽  
Non Invasive ◽  
Analysis System ◽  
User Friendly

A new fast measuring method for process optimization of sucrose crystallization using image analysis based on high quality images and algorithms is introduced. With the mobile, non-invasive at-line system all steps of the sucrose crystallization can be measured to determine the crystal size distribution. The image analysis system is easy to operate and is as well an efficient laboratory solution with user-friendly and customized software. In comparison to sieve analysis, image analyses performed with the ParticleTech Solution have been proven to be reliable.

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