Thanks for your time and efforts appreciating. This is a research paper by Guohua Shen, Tomoyasu Horikawa, Kei Majima, and Yukiyasu Kamitani which is available open-source at journals.plos.org/ploscompbiol/article
Hope you find this helpful :)
I just recently started to fiddle with my brainwaves using an EEG device. Although it is not capable of detecting images in your head, it is still very interesting.