Kittydar (short for "kitty radar"), by Heather Arthur, is an open source, JavaScript library used to detect upright frontal cat faces. You can find its demo application at http://harthur.github.io/kittydar/ and its source code at https://github.com/harthur/kittydar.
Another detector for upright frontal cat faces was developed by Microsoft Research using the Microsoft Cat Dataset 2008. The detector is described in the following research paper but no demo application or source code has been released:
Weiwei Zhang, Jian Sun, and Xiaoou Tang. "Cat Head Detection - How to Effectively Exploit Shape and Texture Features", Proc. of European Conference Computer Vision, vol. 4, pp. 802-816, 2008.
If you know of other works on cat detectors, recognizers, or datasets, please write to me to tell me about them!
