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How to know if findHomography + warpPerspective will give good result beforehand?

I am trying to align some photos by using findHomography + warpPerspective which works great on most of photos. However for some photos it gives really distorted result or entirely washed out with gray color results. So i want to eliminate these photos beforehand and i won't apply warpPerspective to them. My question is how can i examine the result of findHomography so i can skip the warpPerspective if it is going to give me entirely distorted result.