![]() GoPro alternatives: (many are almost identical).The settings for a given camera and lens stay the same, so we've collected some for common cameras used at Public Lab here: But be careful sometimes large images can make the page crash, so save your images periodically so you don't lose them! Presets So you can drag a set of these onto the page one by one, and download them later. If you drag a different image onto the canvas, it'll save the previous one (distorted) below for download. Then you can use the URL of the page (it'll change as you tweak the sliders) to open to that exact setting again. ![]() Sliders are provided, and while each has a meaning in the formula used to correct the distortion, the easiest way to find the right settings is to take a picture of a grid (a checkerboard or graph paper, or a tiled wall) and play with the sliders until the lines are straight. ![]() The distortion varies for different lenses. Note that the corners of the image are cropped out when you do this, however! This is especially useful for making maps in MapKnitter, because distorted images make it extremely difficult to stitch images together into a map - it's like trying to flatten a bunch of orange peels into a flat surface (or something). With a real image, the effect is as shown below, again left/before, right/after. This work was made possible in part by by NASA through the AREN project. FisheyeGL can (like other #lens-distortion techniques) remove this, resulting in a "flatter" image, like the one to the right, below. Note that another way to do this is to install a different lens on your camera if that's possible (see #lens-swapping).įor example, the left image below has a characteristic "bulge" from a wide-angle lens. FisheyeGL is a new online tool for removing lens distortion ("fisheye" effect or "barrel distortion") from images, especially those taken with a #GoPro or Mobius Action Cam (Public Lab's Infragram Point & Shoot).
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