The conventional method of testing a particular
sample is to keep the prepared sample under the microscope,
view the sample and compare it with the standard charts. But
in this method the accuracy of results are totally dependant
on the judgement and experience of the metallurgist. Since
this method is subjective to the experience and the extent
of the person’s perceiving ability to take any decision
regarding the specimen’s microstructures, chances are
that two metallurgists viewing the same specimen may not agree.
Such disputes are a common occurrence between buyer - seller
due to the subjective nature of metallurgical analysis. Image
analysis with the help of computers is a solution to such
To eliminate the mismatch and to find accurate results, one
must be able to measure the various parameters of the sample
by some analytical means.
One way of doing, is to take the photograph of the sample
and enlarge it. Place a graph on the enlarged photo and measure
the required parameters like length, width, area, perimeter,
etc. and calculate the required parameter/result. This will
require dark room facilities and takes lot of time and increases
operator fatigue. For example to find out phase analysis of
a sample, about say five photographs have to be taken at different
fields on the sample, get enlarged then one by one place the
graph on each photograph. Manually calculate parameters in
each photograph, put the parameters in the formulas and find
the final result. Then enter the results in the word type
standard software, take a print output and the stick the photograph
of the on the output. This procedure requires more than one
day to analyse one sample.
The other method is to use MVIG 2005 –
an Image Analysis Workstation developed for Metallurgical
analysis. The workstation will automatically grab the image
of the sample at various fields and calculate results directly.
The printout of the image of the specimen along with the results
can be received within minutes through on a laser printer.
The results along with images can be easily stored in the
memory devices like the hard disk or floppy disks. Dark room
facility for the photographs is not required. Hundreds of
samples in a day can be tested accurately. Also note that
the results can be made pertaining to the any standard for
example ASTM(American std.), DIN(German std.), JIS (Japanese
std.) etc. as per customers requirement.