This cleverly predicts the planet’s appearance before or after the video was actually taken, compensating for any rotational movement between captures.Īs well as correcting separate images to a common time, both WinJupos derotate features align and combine the separate images to create a single corrected final image.īy correcting for rotational smearing, WinJupos allows you to combine far more videos, which has a knock-on effect: you can produce a final output image of greater detail and lower noise than would otherwise be possible. This second part explains how the related Derotate RGB Frames feature does the same thing, only this time with separate red, green and blue filtered images captured with a monochrome camera.īoth of these features work not by allowing you to take longer individual videos, but instead by ‘correcting’ the good images generated from processing each video. Credit: Martin LewisĪbove we showed that the useful imaging window can be significantly widened for images which are of the same type (that is, all taken with a one-shot colour camera, or with the same colour filter for mono RGB imaging) by using the Image Derotate feature of the freeware program WinJupos. Left: the R, G and B images are aligned on the surface detail leading to colour fringing at the edges Middle: the three are aligned similarly but registered to the edges leading to colour separation in the details Right: both edges and detail are aligned via the Derotate RGB Frames function. These can be several sequential videos taken through a one-shot colour camera or several recorded at intervals through the same colour filter for mono RGB imaging.Ĭorrecting to a common time allows you to either add the output master frames from each video together, improving the signal to noise ratio, or reject a greater proportion of bad frames and save the best ones into the final image with a resulting improvement in detail. The WinJupos Image Derotate feature doesn’t lift the restriction on the length of each video but does allow you to correct for differences in the start time of several videos of normal length. This article will concentrate on the much simpler and more popular Image Derotate feature. This has the potential to greatly improve the quality of your images.Īlthough WinJupos does have a sophisticated derotate feature that can correct each frame in a video and thus allow longer videos to be shot without smearing, it’s a complicated and slow process. This might seem to be quite a limitation, but in recent years the freeware program WinJupos has been enhanced to enable you to correct for planetary rotation, effectively allowing you to extend your imaging time by a factor of three or four.
Mars: 5 mins max per video, 15 mins total for all videos you intend to combine
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