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Digitizing of analogue data-charts from thermohygrographs

Radoń J.

Journal of Applied Computer Science

2017

Vol. 25, nr 1

49--60

A thermo-hygrograph is a chart recorder that measures and records both temperature and humidity in an analogue form. Converting the results into digital form is necessary to enhance evaluation of measurements archived on paper charts. Coordinate system of the charts is different than common Cartesian rectangular axis. Temperature and relative humidity axis are curved according to recorder pen holder ray. Different chart types, depending on particular thermohygrograph model, were used so far. In every case, however, the axis grid depicted in the background is geometrically precisely defined. So pattern recognition techniques could be used to find its location automatically. Temperature and relative humidity patterns can be retrieved automatically assuming that the color group of plotted lines is different than the background including the grid. Due to storing conditions, manual descriptions, discoloration and other factors, the plotted pattern cannot be unambiguously identified. Many randomly scattered pixels are interpreter as being part of a plotted line. Among additional measures, like excluding particular areas from analysis, manually removing and including points, a vector analysis of retrieved courses makes digitizing more effective.

The errors of the CMM software algorithms shown on the example of the length measurement

Swornowski P.

Archiwum Technologii Maszyn i Automatyzacji

2002

Vol. 22, Nr 2

73-78

Determination of characteristics of error regerding CMM software has a significant metrological meaning, as with a small number of measuring points instability area of approximation or interpolation method occurs, what in consequence can be observed in a final result. There were 10 algorithms of CMM software tested on length measurement between two planes with the shape deviation. The way of generation of the final error was analyzed step by step. The attention was paid to the software of CMM that cause a large error in the results.

Wyznaczanie charakterystyki błędów posiadanego oprogramowania ma istotne znaczenie metrologiczne, gdyż przy niewielkiej liczbie punktów pomiarowych znajdujemy się w obszarze niestabilności metod aproksymujących (lub interpolujących), co wpływa na ostateczny wynik. Przebadano 10 oprogramowań WMP w zakresie wyznaczania odległości między dwiema płaszczyznami mającymi błędy kształtu. Przeanalizowano krok po kroku mechanizm powstawania błędu w wynikach. Szczególną uwagę zwrócono na algorytmy obliczeniowe oprogramowań WMP, które powodują powstawanie dużych błędów w wynikach.