For the expert Programmers only

Hi, 1- I am seeking a way to identify the uploaded image to control the duplicate of an existing image in my site even if they were different resolutions and/or had minor differences due to compression artifacts, size etc.. So, if there is anyone who could create a script or plugin which can find any duplicate photos during uploading? 2- Creating a script for the sitemap url to submit all urls to the domain and in each page in the site, this work should be automatically by the script without duplicate or broken URL's, and also to paste the Google analytic code to each page in the site by the script...