{"id":419,"date":"2021-10-07T23:08:42","date_gmt":"2021-10-07T21:08:42","guid":{"rendered":"https:\/\/www.ntnu.no\/blogger\/richard-hann\/?p=419"},"modified":"2021-10-11T10:48:43","modified_gmt":"2021-10-11T08:48:43","slug":"preventing-motion-blur-in-drone-mapping","status":"publish","type":"post","link":"https:\/\/www.ntnu.no\/blogger\/richard-hann\/2021\/10\/07\/preventing-motion-blur-in-drone-mapping\/","title":{"rendered":"Preventing motion blur in drone mapping"},"content":{"rendered":"\n

Motion blur is an unwanted photo effect<\/a> that occurs when a picture is taken with a long exposure and rapid movements. In drone mapping, motion blur occurs when the drone is flying at a high speed while taking pictures. If the flight speed is high in comparison with the shutter speed and the ground resolution, or ground sample distance (GSD)<\/a>, motion blur occurs. Because motion blur depends on the GSD, it also depends on the flight altitude and the type of camera. <\/p>\n\n\n\n

In practice, motion blur can occur during missions at low altitudes, low-light conditions, or high flight velocities. Motion blur reduced the quality of the taken images and leads to low-quality mapping products such as digital elevation models (DEMs) or orthomosaics. For this reason, it is important to take motion blur into consideration during the planning and pre-flight phase. In the following, I will present a simple method that can mitigate the motion blur ris.<\/p>\n\n\n\n

To prevent motion blur, a good rule of thumb is that the camera shutter speed should be so faster than the time it takes for a point on the ground to move one GSD-length. Ideally, this prevents that a ground point from getting captured more than once by the camera. The maximum allowed shutter speed can be calculated with: <\/p>\n\n\n\n

Maximum shutter speed = Ground sample distance \/ Drone speed<\/pre>\n\n\n\n
Calculating the GSD requires specific information about the camera type. To make things easier, I have prepared a few tables for the most common drone types and calculated the maximum shutter speeds to prevent motion blur. <\/p>\n\n\n\n
\n
\n
\"\"<\/a>
Max motion blur shutter speed for DJI Mavic 2 with Hasselblad camera<\/figcaption><\/figure>\n<\/div>\n\n\n\n
\n
\"\"<\/a>
<\/a>Max motion blur shutter speed for DJI Mavic 2 with zoom camera<\/figcaption><\/figure>\n<\/div>\n\n\n\n
\n
\"\"<\/a>
<\/a>Max motion blur shutter speed for DJI Phantom 4 Pro series cameras<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n
How am I using this in practice?<\/strong> Before starting a mapping mission, I am fly the drone to the desired altitude and take a few sample pictures to check which shutter speed the current conditions require (I usually use the “auto” camera settings). If the shutter speeds are higher than in the tables, I would fly the mission with a slower velocity. I could also increase the altitude, but since I have usually planned for a specific GSD, I typically want to avoid changing it. <\/p>\n\n\n\n
\"\"<\/a>
The automatically suggested shutter speed is shown on the control displace. Here it is 1\/120. <\/figcaption><\/figure>\n\n\n\n
Example:<\/strong> During a mapping flight in Svalbard in early October, I encountered relatively low-light conditions and had to wanted a GSD of about 2cm\/pixel for a high-resolution orthomosaic of a river delta. With a Mavic 2 Pro. My plan was to fly at 90m of altitude with a cruise speed for 30km\/h. The test pictures indicated that the shutter speed would be between 1\/320 and 1\/400. Since the maximum motion blur shutter speed for according to my table is 1\/500, I decided to decrease my cruise speed to 18km\/h. The pictures came out crisp and clear.<\/p>\n\n\n\n
<\/p>\n\n\n\n
\"\"
No motion blur!<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"
Motion blur is an unwanted photo effect that occurs when a picture is taken with a long exposure and rapid movements. In drone mapping, motion blur occurs when the drone is flying at a high speed while taking pictures. 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