This demonstration shows how to apply a filter to a part of an image and put the result back on the original.
The blurring demo consists of an image source and three tools.
Cropping Tool quickly extracts a rectangular portion of the input image. Cropping is done by dragging and dropping the
Sizeparameter on top of the input image. You can choose the region of interest by resizing the yellow widget that appears on the image.
Linear Filtering Tool has a number of predefined filters. Here, a uniform (box) filter is used for blurring the image. You can change the amount of blurring by modifying the
Filter Sizeparameter. You can also define your own filter by setting
Image Joining Tool can stitch up to eight images into a single image. If the images are taken from different positions (i.e. they have different frame/size settings), the tool recalculates the output image so that it appears to be coming from the camera connected to
Image 0input. In this example, the cropped and blurred part of the image (input
Image 1) is overlaid on the original image (input