With the rapid development of multimedia technology and the Internet, privacy protection of multimedia data is facing more and more challenges. The widespread application of cloud computing and big data, on the other hand, has further exacerbated people's concerns about privacy security. However, multiparty computation, homomorphic cryptography, functional encryption and other cryptographic techniques have made possible the blind computation of data under ciphertext. In particular, visual blind computing is to detect, identify, search, and deal with data without touching their original contents such as images and videos. As a new direction in the combination of computer vision and cryptography, it has a wide range of applications in video monitor, multimedia data sharing, cloud computing, mobile computing and other fields. This paper reviews the development history of visual blind computing technology, summaries the key technologies for video monitor, face detection, face recognition, face retrieval, machine learning and so on, and looks into the development trend of visual blind computing technology.

visual computing  /  cloud computing  /  homomorphic cryptography  /  multiparty computation  /  privacy protection