In this paper, we introduce new method that out of focused image makes focused by using example-based point spread function. For restoring a out of focused image, we must generate a point spread function that represents an out-focusing phase. Especially, we need a fair of focused image and out of focused image to generate a point spread function. Then we can generate a point spread funcion by calculating the difference of a fair sample image in linear system. Generally, we can restore focusing image by applying a point spread function on the deconvolution method. We can apply this mehod to restoring an out of focused image without getting another focused image. Also we can extend this method which can focus to the specific object in the image that has many objects inside.
