Bot for World of Warcraft 3.3.5 to use computer vision in order to perform the in-game fishing mechanic.

The bot sends a keystroke to throw the bobber in the water. Then it takes a screenshot and uses a convolutional neural network to find the bobber location (see detection algorithm). After that, it captures the specific part of the screen constantly until a certain luminosity threshold is exceeded, which means that the bobber has sunken, releasing bright water particles. Then it sends a mouse right click at the location of the bobber to capture the fish.

The core of the detection algorithm is a neural network able to decide whether a bobber is present in an image or not. Its architecture consists of convolutional layers with max pooling layes in between and followed by some linear layers. It takes an 2D colored image as input and outputs the probability of a bobber being present.

This neural network was trained by a computer generated dataset. Each positive image in this dataset contains a randomly rotated, translated and scaled instance of a rotoscoped bobber in front of a randomly zoomed background (out of many captured in-game backgrounds) with added noise. Each negative image contains only the noised background. The backgrounds have random rectangles blacked out for reasons that will become obvious later. To detect the position of the bobber using this neural network the following algorithm is used:

1. The neural network is applied to a sliding window with a fairly large size to find the general area of the bobber.
2. The window with the highest probability is then split through its max length axis to two or three parts. Only one of these parts is alternatingly kept, while the others are blackened out. The products of this process is passed through the network to locate the subwindow in which the bobber lies.
3. If the dimensions of the subwindow are small enough, the process terminates, else we repeat step 2 to the subwindow.

• Danai Efstathiou (danaiefst)
• Dionysios Spiliopoulos (Dspil)

This bot was not used for cheating but purely for research purposes.