On your galaxy note 4 there is a way to create a camera short cut on the lock screen. This can actually come in handy when you need to take a quick photo, and you can go straight to the camera without having to enter any kind of password to waste time getting through your lock screen. So what you want to do to create this short cut is first go into the settings and click on lock screen. Once in this section there will be a camera short cut option simply make sure its check marked. Once you do that you should see a camera short cut on the lock screen of your samsung galaxy note 4.