image-quality

How to detect a hotspot in an image using opencv? I have tried googling but couldnt get a clue of it. Description: I need to filter good images from a live video stream. In this case I need to just detect the Hotspot in a frame. I need to do this in opencv. What is HotSpot? Hot spots are shiny areas on a subject’s face which are caused by a flash reflecting off a shiny surface or by uneven lighting. It tends to make the subject look as if they are sweating, which is not a good look. Update : http://answers.opencv.org/question/7223/hotspots-in-an-image/ http://en.wikipedia.org/wiki/Specular

Is possible to generate a PDF document using Itext which contains imgages with a resolution of 150 dpi. (Seems to be that Itext is reducing the quality of images to 72 dpi.) Thanks See this thread , specifically this post which explains that PDFs don't have a concept of DPI. This thread is a good read, too. Essentially (and this isn't technically accurate but close enough) by default, when you place an image using iText assume for every 72 pixels that 1 inch of printed space will be used. If you want to change this rule then you need to change the image's matrix . You can either do this