This example shows that automatic detection doesn't consider the nature of the scene photographied. The structure of the panorama is now well constrained, with control points showing almost no parallax, we can use the Move panorama tool (Panorama mode) to adjust the horizon. To avoid wavy shape on the skyline, we will add links between the 2 photos rows, eg between images 16 and 34 then images 15 and 33. We can see the clouds are no more perfectly aligned, but it is correct due to the weather conditions. We can check that the skyline doesn't contain any stiching error. Let's have a look to the resulting panorama (RMS : 2.35): In case an image pair contains control points on the foreground, it requires to remove them and to constraint the detection on the skyline level (taking care to search points doing quite large search ing areas to find control points). This correction must be applied on all the links of the upper line, regardless of the RMS value. We remove all the control points, on the cloud and on the water, then we search points near the skyline. Let's modify the control points as shown below: Therefore, we cannot consider them as valid. Then a parallax issue occurs: the points nearest to the skyline move less than the farest points (in the image plan). Here are the control points between photos 11 and 12 (RMS : 5.83)Įach of those control points are wrong between the images there! Indeed clouds have moved during the shooting, so the points don't link stationary objects. Moreover, we can notice that the 2 lines are not linked together on the whole panorama length (Autopano didn't found any control points between those images).Ĭonsidering the scene (moving clouds and sea), it is not really surprising. The initial structure seems ok at first glance, even if some links have high RMS values. Here, we can see 2 kinds of stitching problems:Įven if we use the Automatic horizon tool, the skyline issue is not fixed, we will see why.įirst of all, let's have a look to the panorama's structure, to check where the control points have been detected. Using the default settings, Autopano Giga created the following panorama: It is important to notice than the shooting has been done under windy weather. In this tutorial, we will solve this problem on a real world example. When a stitching presents such a default, the overall panorama's quality is affected. Indeed, human eye is accustomed to the continuity of skylines. Skyline is a critical element of a panorama.
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