Presented model expands the bi-directional interface for human-computer interaction. It broadens the communication channel from a man towards a computer. This is achieved by using a digital camera devices in the HCI interface and the use of novel (taken from the literature) image analysis. Proposed interface use the full bandwidth video channel, thereby increasing the interface adaptability skills. Such solution allows to expand HCI to other modalities (eg. sound). Developed mechanism of three-level adaptation allows to create an interface tailored to the expectations of the individual user. This is particularly important in the case of therapeutic treatments and persons with disabilities.