Galileo's Sky

剛剛上 Wikipedia 查了一下 有關 image stacking 的說明, 以下節錄其內容:

The shift-and-add method (more recently "image-stacking" method) is a form of speckle imaging commonly used for obtaining high quality images from a number of short exposures with varying image shifts. It has been used in astronomy for several decades, and is the basis for the image-stabilisation feature on some cameras. The method involves calculation of the differential shifts of the images. The images are then shifted back to a common centre and added together. This provides an image with higher resolution (higher signal-to-noise at high spatial frequencies) than a conventional long exposure image. A number of software packages exist for performing this, including IRAF, RegiStax, Keiths Image Stacker, Stekkit and Iris.

我目前用的軟體是 RegiStax 和 Iris.