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I am currently working on an intrusion system based on video surveillance. In order to complete this task, I take a snapshot of the background of my scene (assume it's totally clean, no people or moving objects). Then, I compare the frame I get from the (static) video camera and look for the differences. I have to be able to check any differences, not only human shape or whatever, so I cannot specific feature extraction. Typically, I have: I am using OpenCV, so to compare I basically do: cv::Mat bg_frame; cv::Mat cam_frame; cv::Mat motion; cv::absdiff(bg_frame, cam_frame, motion); cv:

How can I get the difference between two images? I have the original image. Someone has written on an exact duplicate of the original image. Now, I need to compare the original to the written on image and extract just the writing in image format. Example: I have a picture of a house. Someone took a copy and wrote “Hello!” on the copy. I want to somehow compare the two pictures, remove the house, and be left with an image of the words “Hello!”. Is this possible with ImageMagick? I know there are ways to get the statistical difference between images, but that is not what I am looking for. My own

What is the difference between memoization and dynamic programming? I think dynamic programming is a subset of memoization. Is it right? What is difference between memoization and dynamic programming? Memoization is a term describing an optimization technique where you cache previously computed results, and return the cached result when the same computation is needed again. Dynamic programming is a technique for solving problems of recursive nature, iteratively and is applicable when the computations of the subproblems overlap. Dynamic programming is typically implemented using tabulation, but

What is the difference between JVM , JDK , JRE & OpenJDK ? I was programming in Java and I encountered these phrases, what are the differences among them? JVM The Java Virtual Machine (JVM) is the virtual machine that runs the Java bytecodes. The JVM doesn't understand Java source code; that's why you need compile your *.java files to obtain *.class files that contain the bytecodes understood by the JVM. It's also the entity that allows Java to be a "portable language" ( write once, run anywhere ). Indeed, there are specific implementations of the JVM for different systems (Windows, Linux,