18. At Close Range
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In this paper a stereophotogrammetric algorithm based on a black-box approach to the modelling of object to image spaces relationship is proposed. The algorithm is well suited for 'very close-range photogrammetry', with respect to experiments in which the measurement field is 0.5 X 0.5 X 0.5 m or smaller, as in the analysis of a few or small body segments movements. The attainable accuracy is high, better than 0.1% of the observation distance. Non-professional and even different cameras can be used. Consequently an inexpensive experimental set-up can be realized. A very simple, cheap and easily usable calibration object is needed. Computation time for the reconstruction of object-space co-ordinates of point body landmarks is one order of magnitude lower than in the case of the Direct Linear Transformation (DLT) (Abdel Aziz and Karara, Proceedings of the ASP/U1 Symposium on Close-Range Photogrammetry, pp. 1-18. American Society of Photogrammetry, 1971; Marzan and Karara, Proceedings of the Symposium on close-range Photogrammetric Systems, pp. 420-467. American Society of Photogrammetry, 1975). Computation time for calibration is two-fold in respect of the DLT. An example of application to the recording of the movements of the index finger with respect to the metacarpophalangeal joint is given.
The Airnamics R5 unmanned aerial system (UAS) provides cinematographers with a camera motion system for close-range aerial filming. With a top speed of 130 kph (80 mph), a camera payload of 8 kg (18 lbs), and a GPS system accurate to within 25 millimeters (1 inch), the R5 is designed to deliver unprecedented levels of performance, safety, and ease of use.
They ran closed-loop simulations of the control model and plant model to verify controller functionality. As the design progressed, they simulated sensor failures, motor failures, wind gusts, and other scenarios.
The image in this post was taken from a U.S. Air Force F-15 Eagle from the 131st Fighter Squadron, 104th Fighter Wing, Barnes Air National Guard Base, Massachusetts, during a close range aerial combat exercise against a U.S. Air Force F-22 Raptor from the 154th Wing, Joint Base Pearl Harbor-Hickam, Hawaii.
Michael Upchurch The Seattle Times Book Review Her characters -- stoical, hardheaded, yet willing to be ravaged by the closest available passion whenever the chance presents itself -- crackle and cavort on the page. Served up a full array of life's wayward ecstasies and gut-twisting losses, they resign themselves, in true Proulx fashion, to the damage that loss and ecstasy do....Amen to that, and amen to this book.
Whenever Big Brad does choose to come around, throwing his estranged wife a few pennies for household expenses, he usually always has a hefty wad of cash on him, and always pulls up in a fancy ride, like this Olds 442 convertible:
To keep the lens as light as possible, SIGMA constructed the body from carefully selected materials. A polycarbonate called Thermally Stable Composite (TSC) was used for the construction of the barrel, which is sleek, robust, and importantly has a thermal conductivity close to that of aluminum. This ensures stable performance and good operability when used in changing temperatures. By deliberately using metal for some of the internal structure, the parts could be much thinner and have a higher rigidity, ensuring the lens can stand up to frequent, heavy use.
The SIGMA 18-50mm F2.8 DC DN | Contemporary has fast and near-silent AF that makes it perfectly suited to a range of photographic applications, including shooting in quiet environments, recording videos and capturing fast-moving subjects. This has been achieved by using a stepping motor as the AF actuator. Since it is small and lightweight, it can be used flexibly in situations such as handheld shooting, which requires high mobility, gimbal shooting, one-man operation video shooting and vlogging.
With an emphasis on making the lens as versatile as possible in a wide variety of shooting conditions, SIGMA designed the lens with a minimum focusing distance of 12.1cm and maximum magnification of 1:2.8*, making it also ideal for close-ups.
* L-Mount is a registered trademark of Leica Camera AG.* This product is developed, manufactured and sold based on the specifications of E-mount which was disclosed by Sony Corporation under the license agreement with Sony Corporation.
Recently, photogrammetry has seen a major democratisation by the advent of low-cost sensors [14,15], more powerful computing capacity [16,17] as well as availability of drones in the public market [18,19]. The latter greatly facilitated close-range photogrammetry as it enabled an aerial point of view which was previously a major constraint in data acquisition. Indeed, 3D reconstruction in general is slowly becoming the standard in mapping, replacing traditional 2D methods and products.
This was so informative. I have saved other articles of yours to read at a later time. I would like to see other links from you posted on the bottom of the page. I have made a few mistakes in gun purchases and I have also had a few winners. Those were guns. Now I am looking to better my collection and have at least one short, one medium and one long range gun for every person in my house. Thank you for the time, research and information. Very useful.
Great intro to scopes. I usually use shotguns for clays and duck, and just getting into long range shooting and found this extremely informative and fun to read through. Thanks for the time and effort!
Officers pursued the suspect at close range. As officers were identifying the suspect, he turned immediately and fired shots, striking the officer. The officer fired back, striking the suspect, Brown said.
Following months of protests against excessive force by police in Ferguson, Missouri, a review of the official autopsy report says Michael Brown was shot at close range and did not have his arms raised in surrender at the time.
In several experiments, researchers from the California Institute of Technology (Caltech) asked study participants to judge 36 photographs showing two different images of 18 individuals. One image in each pair was taken at a close range of about 2 feet (0.6 meters) and the second was shot from a distance of about 7 feet (2.1 m).
The researchers chose these two distances because one is within, and the other outside of, the traditional boundaries of personal space. In order to see the effect of the closer range, and not other associated factors, the researchers made sure the faces in each set showed the same expression and appeared to be the same size.
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As we get closer to small objects, the image size on the sensor gets much closer to the real-life size of the subject. Eventually, we can get close enough and still keep the subject in focus. This way, we can produce an image the same size as the subject.
What if you prefer to keep your lenses attached to your camera? You can use close-up lens filters on the filter thread of your standard lens. These generally come in a set of different magnifying powers (diopters).
Shopping malls, city sidewalks, and airports are planned with this distance requirement. This range is also used in public speaking, giving a formality to the communication delivered. This type of space does not require eye contact or any personal contact, whatsoever. 781b155fdc