On 1月7日, 上午4时14分, J Kenneth King <ja...@agentultra.com> wrote: > I'm curious as to what application the solution to this problem is > practical for all of its difficulty? Sorry, I oversimplified the question because of my poor english. It is an analog compass whose value we need to read into the computer every second. We use a video camera keep shooting it, and the compass and camera are fixed. -- Li Han
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