OSM – On Screen Measuring and Image Manipulation
OSM is an easy to use software for image aquisition, manipulation and on screen measuring It supplements any Dendrochronological analysis software with functions to analyze and measure ring width data from images obtained from various sources, including flatbed scanners and video cameras.
On the OSM virtual measuring table you can measure single images or create and measure image series containing an unlimited number of individual images at once. By combining OSM with PAST potential measurement errors can be edited directly on the measurement object. Data can be exported to a variety of formats, including Format Heidelberg, Tucson or plain ASCII.
The functions of the OSM software can be divided into the following sections:
- Image aquisition: After finding and preparing samples this is usually the first computer based step in a dendrochronological analysis with PAST/OSM. Since there exist so many different possibilities of the form and condition of a piece of wood (manually smoothed wood cores, sanded cross sections, untreated and untreatable longitudinal sections of wooden artifacts to name a few) it might not be easy to get a good measurable image of the ring borders into the computer. OSM helps you by supporting both video cameras, Canon SLR cameras and flatbed scanners. Additionally you can create more than one surface images (provided they are overlapping) and then align those images to multi-image mosaics.
- Image processing: After getting raw images into the PC it might be necessary to further process those images before measuring. Steps involved might be contrast adaptions, color inversion or conversion to black/white or grayscale. OSM also offers basic tools to change image resolution, crop images and rotate in fractions of degrees. Additionally it might be necessary to calibrate images by detecting and setting a proper dpi (dot per inch, a measure of the image resolution) value.
- Measuring: All measuring is done with a mouse or any other pointing device of your choosing, including your finger (if you use a touchscreen). It is easily possible to measure more than one ring width series in one image or image mosaic and later build mean value series with PAST5. Of course measurement data can always be exported to the most common file formats used in Dendrochronology, Format Heidelberg and Tucson.
- Interaction with other software: While other software products that allow to take on screen length measurements end here, OSM and PAST go one step further. With the "Rewire" function PAST5 and OSM4 can be connected over a TCP/IP network and with a mouse click on a dendro record in PAST5 OSM4 will open the corresponding image and measurement file. You then may scrutinize and edit the measurements in OSM and reimport the data into PAST5 with one mouse click.
|Any image aquisition method is limited to a certain area. If you use an A4 flatbed scanner, the maximum size of your sample may not exceed 297mm, otherwise a part of the surface will be truncated. If you work with a video source such as a DSLR or a video camera, depending on the used lens system the maximum area of a single image will be much smaller, often only several square millimeters.|
To overcome this problem OSM4 projects may contain an unlimited number of individual images. These images may overlap and then cover a bigger area or they may depict different "takes" of the same sample (e.g. two opposing radiuses).
|With the use of index points you can easily change the position within a measurement path, an option that is often necessary if your measurement path crosses an image border or the image contains a spot that is not readable. |
Index points also help to bridge gaps or cracks in the sample surface.
|Often you will need to make more than one measurement of an image or image mosaic. If your image contains a full cross section of a stem or branch you nearly always will want to take two or more measurements of different radiuses. The new path function allows to take multiple measurements on an image or image mosaic, allowing to re-measure a sample at a different position or measure two or more radiuses in one step.||
A combined PAST5/OSM4 bundle is available at reduced prices.
Existing PAST5 users may purchase a sidegrade license to OSM4.
To receive an individual quote please contact info(at)sciem.com!