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izumitelj

izumitelj 's Public Library

  • process called Photogrammetry or Structure from Motion (SFM) where the computer examines common features in each image and is able to construct a 3D form from overlapping features.
  • Total blackbox:
    • two outputs of this step are:

       
         
      • a .out file (bundler format) which stores the calculated (solved) cameras’ positions and a sparse point cloud representing the points in the scene that the software used to determine the camera positions.
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      • a .ply file which stores a denser cloud of points, each with position, color and normal (a vector perpendicular to the surface the point is on) data.

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  • Photogrammetry is the science of making measurements from photographs, especially for recovering the exact positions of surface points.
  • Photogrammetry feeds the measurements from remote sensing and the results of imagery analysis into computational models in an attempt to successively estimate, with increasing accuracy, the actual, 3-D relative motions within the researched field.
  • Photogrammetry is as old as modern photography,

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  • Reverse Engineering is the process of recreating a model from an original.
  • Each system has its own set of advantages, but the end result for each is a point cloud of coordinates.
  • basically two types of 3D scanners available, contact and noncontact.

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  •    

    To make a laser graphic, two tiny   computer-controlled mirrors aim the beam at a screen. The beam bounces   first off of one mirror moving horizontally, then off another at right   angles, moving vertically.

     

    The computer literally “connects   the dots”, aiming the mirrors from one place to another fast enough that   the viewer sees a single outline drawing. This process is called   “scanning”. The computer-controlled mirrors are galvanometer “scanners”.

  • If one color is sufficient,   lime-green is the most common and economical. One benefit is   that lime-green (532 nanometer wavelength) is much more visible to the   eye than blue or red. One watt of lime-green light looks 2-3 times   brighter than one watt of red or blue light.
  • Laser color: Green is most visible You can use a less powerful (and thus   easier-to-use and less expensive) laser if green is acceptable.

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  • The best thing you can do to attain steady improvement is to practice a specific skill on each flight. If you always take off with the intent of merely flying around, you may eventually develop a reactionary skill set.
  • To gain that proactive flying ability, you have to become comfortable flying the quad regardless of its orientation. A pilot should start with the basics and gradually add skills of increasing difficulty until it’s all second nature.
  • The first thing you’ll want to learn is how to maintain a steady hover with the quad pointed away from you. It sounds rather easy, but it can be challenging, especially with twitchy quads. You’ll have to manage your throttle inputs to keep a constant altitude while also correcting any drift in pitch, roll or yaw.

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