What are the "Invisible watermarking" algorithms used to embed and extract invisible watermarks in image?

I need 3 basic invisible image watermarking algorithms to proceed with my project work.

I'll briefly explain the components in my project below : 1) Develop an algorithm to - Construct watermark a) that cannot be totally removed form our image - should contain any fossils of our watermark that cannot be removed. b) After tampering we should ensure that watermark is copyright to us .. hence we should come up with the algorithm that provides ownership authenticity

2) Change Detection and Reconstruction - How much our watermark is changed in tampered image... then Reconstruct our watermark with remaining information in the tampered image.

3) Take the tampered image .. Identify the percentage (%) of copying done in the forged image - Finally we should identify, up-to what extent (minimum no of pixels) we could identify the tampering.

Hence i have gone through Arnold Transformation, LSB encoding techniques.. But i'm not exactly sure how it will satisfy my project basic components.

Please provide me links,suggestions on algorithms to be used to satisfy my above mentioned constraints. It's preferable if implementation of algorithm is available in web :)