Abstract. Nowadays there are many types of accessible cameras, including digital single lens reflex ones. Although these cameras are not usually employed in machine vision applications, they can be an interesting choice. However, these cameras have many available parameters to be chosen by the user and it may be difficult to select the best of these in order to acquire images with the needed metrological quality. This paper proposes a methodology to select a set of parameters that will supply a machine vision system with the needed quality image, considering the measurement required of a laboratory glassware.

Abstract. Currently, most advances in dimensional metrology might be seen by the evolution of noncontact measurement (optical measurements), in order to provide traceability for different areas that needs to calibrate microscopes or optical measure machines. In a similar way, the use of image processing techniques for the measuring of objects has been the subject of recent studies in computer vision and image metrology. In the attempt to meet the requirements and demands for high accuracy dimensional metrology with image processing techniques, this work will present the application of the image registration technique for the measurement of line scales. In the conventional calibration, the scales are measured in preestablished points, generally in intervals of 10% of the total scale length. With this application, it becomes possible to provide results for all the scale marks quickly and automatically, whereas in the conventional method it would require more time and, thus, a higher cost for the fulfillment of this measurement.

In this article, we study the relation between viscosity and temperature of several biodiesel types (soybean, sunflower, corn, castor bean, and animal fat based) in a metrological point of view. All the biodiesel types were obtained by a transesterification reaction with methanol in the presence of an alkaline base as a catalyst. The biodiesels had their viscosities measured using capillary viscometers following Brazilian standards, in temperatures ranging from 20°C to 40°C. An extra study was performed with another beef tallow biodiesel (transesterified with ethanol) with temperatures up to 100°C. For all the measurements, the uncertainties were calculated. Even though there have been many studies on biodiesel on recent years, most of these do not have a metrological focus. This study shows the behavior of the biodiesel viscosity in a temperature range of 20°C to 40°C, and also how its composition influences the viscosity.