The cover story of Vision System Design April 2016 shows one 3DExpress application done by one of our customers.
Vision System Designs, the leading vision magazine, publishes in this April issue an article about SAL3D being used to scan small fish bones for a scientific study.
To identify different types of fish and the relationships between various species, Antoni Lombarte at the Mediterranean Center for Marine and Environmental Research (CMIMA; www.cmima.csic.es) is using a 3-D image scanner to digitize otoliths-calcified structures found in the inner ear of fish. Each fish species is characterized by a specific morphology of otoliths, which can be used in automatic identification tasks. Using 3-D images helps to increase the efficiency of these systems.
Because the structures are not digested when fish are eaten by other prey, they provide an indication of the diets of specific species. Moreover, since otolith growth is related to the fish's growth and the environmental changes in the fish's habitat, studying the proportions of the various components that make up the otolith can determine fish growth, mortality, and population dynamics.
Full article at Vision Systems Design online
Andrew Wilson, editor of Vision Systems Design, collects in a single article the most relevant novelties of VISION 2012 show and the first chosen products are 3D Machine Vision Library and 3DExpress, from AQSENSE.
"On the booth at ImagingLab, the company demonstrated a system developed for SINTEF that is designed to automate the process of fish fileting (see Fig. 1). It is first necessary to recreate a 3-D image of the fish as it is transported along a conveyor, so a structured laser light from Z-Laser is used to illuminate the profile of the fish. This structured laser light is then captured along with visible light using a 3-D Ranger camera from SICK.
To automate the process of fish fileting, structured laser light is used to illuminate the profile of the fish. Inset: Images captured by the camera are then used to render a color image and a 3-D model of the fish. Source: Vision Systems Design
In the demonstration at the show, both the structured light and camera were mounted on a robot from DENSO Robotics. In this configuration, the light source and camera were moved across a stationary model of a fish.
By incorporating ImagingLab's robotics library for DENSO robots with the 3D-Machine Vision Library (MVL) from AQSENSE, captured images from the robot can be rendered as both a 3-D profile and a color image. This enables the size and quality of the fish to be determined as well as how to position a cutting mechanism to filet the fish. At present the system uses structured and color image data; future implementations may incorporate ultraviolet (UV) and infrared (IR) imagers to provide additional information about the quality of the fish.
To ease the task of configuring 3-D systems, AQSENSE demonstrated its 3DExpress preprocessing software at VISION 2012. Designed to be used with a number of structured-light systems and 3-D cameras, the software allows data from these sources to automatically generate a 3-D representation, manipulate the point cloud, and finally export the result so it can be further processed by standard third-party imaging tools such as Sherlock from Teledyne DALSA or with programming languages such as C++ or .NET. A video tutorial about 3DExpress can be found at http://bit.ly/SLxmQw."
The AQSENSE collaboration, through Iris Vision, with the University of Utrech for the Eurotank project has been selected by Greg Blackman for an article on the Imaging Machine Vision Europe Magazine.
"The Gale Crater on Mars was chosen as a target site for Curiosity, as the region has shown evidence of once containing water, that property vital for life everywhere. Previous work with NASA’s Mars Reconnaissance Orbiter has identified clay minerals in the area, which would form with adequate liquid water, although this is thought to have occurred more than 3 billion years ago.
At Utrecht University in the Netherlands, NASA is attempting to recreate certain geophysical rock formations and patterns found on Mars in a purpose-built 7 x 12m tank designed to investigate how rivers form. The Eurotank, a project built by the geophysical department of Utrecht University, is a large tank that can be positioned in all three axes. It is filled with sediment, positioned in a downstream angle, and water flowed through the sediment. Investigations are then made into the movement of the particles with the flow of water. Different soils with different grain sizes will have different deposition patterns and, using the tank, scientists can study the behaviour of various sediment materials.
Some of the surface features on Mars resemble the meanders and patterns created by rivers. NASA is using the Eurotank to simulate a possible set of circumstances that would create these types of surface features, with the hypothesis that in the distant past they were created by water.
Full article at IMVE Magazine
This month's Quality Magazine comes with an entire article (entitled "Software & Analysis: The Gate to 3-D Quality Control") dedicated to SAL3D use for 100% inline quality control. The article reviews and explains the full process, from the acquisition to the CAD model comparison and the measurement of the regions of interest.
2-D quality control has been widely used for solving tons of industrial applications where the position of the piece was previously known, and thus, a precise picture of the desired plane could be taken. Several 2-D tools are able to align defined regions to the processing images, however, this is only possible in cases of flat objects always located in the same plane. But, what happens with complex 3-D objects with 6 degrees of freedom in the object position? In these situations, 2-D techniques fail at providing a precise solution, hence bringing 3-D into play.
Until now, due to speed limitations, 3-D scans have been done outside the production line on random samples. But thanks to 3-D software1, 100% of the production can be analyzed at production time, directly on a conveyor belt.
Let’s take, for example, a production line—any industry will do—where parts of the produced objects must comply with demanding dimensional accuracy standards. The objects are coming on a conveyor belt in random positions and, therefore, they can be tilted, shifted or rotated in any axis. Knowing where the critical parts are in order to ensure their dimensions is not an easy task and can hardly be done by means of 2-D techniques. In this article, we will elaborate on how this can be quickly and easily done by using the 3-D software library together with any standard 2-D analysis tool.
Full article at Quality Magazine
Anyone who has ever endured major dental work will be familiar with the process used to take dental impressions. After placing a viscous liquid alginate in a dental impression tray, a technician presses the tray onto the patient's teeth until the liquid sets to form a solid negative impression. This impression is then employed to make a plaster cast of the teeth, which is used to study the best way of fabricating dentures or crowns.
To ensure that the prosthetic teeth are precisely made, these plaster casts are 3-D scanned and the 3-D data generated used to create a CAD model of the plaster cast. The models can be manipulated using CAD packages to simulate the placement of prosthetic teeth. After successful modeling and simulation, models of newly created prosthetic teeth are sent to a CNC machine to produce the final prosthetic product.
To date, a number of 3-D scanner companies such as 3Shape AS and smart optics providers such as Sensortechnik have built products to address this market.
While such products are effective, engineers at the Velasco Group recognized the need to reduce the scanner cost. The company has expanded its activities into the dental market with the introduction of its XCAD scanner (see Fig. 1). Marketed by XCADCAM, the scanner was conceived by Leandro Velasco, director of the Velasco Group. Rather than use fringe pattern projection or multiple cameras in the design, the scanner incorporates a structured-light system that illuminates the mold as it is rotated on a 9-cm-diameter platen (see Fig. 2).
Full article at Vision Systems Design