is there any library for detecting an eye in a given rectangle (and the eye's size) , while the camera preview is still showing its content (non stop) ?
i need to find an easy way to acheive this . i've found out that there is an API for face detection , and that on android 4 they also added eyes detection , but only if it found a face , yet i need to find an eye even without any face.
You could always ook at the source code for Android and see how they do Eye detection.
Otherwise check out this question: OpenCV eye tracking on Android
If you want to see an example of opencv on android, click on this open source code.