In recent years, holographic projection technology as a 3d virtual imaging technology has been widely used in various fields. Holographic projection technology, also known as virtual imaging technology, its imaging principle belongs to the optical category, that is, using the optical principle, to collect all the optical information of objects, and make these optical information of objects in the real space in the form of three-dimensional reproduction. In the field of clothing, with the development of digital clothing, 3d virtual clothing display has become an important development direction and research hotspot for its advantages such as convenience, cost saving and realistic effect. The combination of 3d virtual clothing display technology and holographic projection technology opens up a new path for virtual clothing display.

Holographic projection technology shows three-dimensional virtual images in front of the audience, giving people a strong sense of depth, and has a strong advantage in three-dimensional display. In the field of clothing, clothing display mainly includes traditional display and 3d virtual display. The traditional display includes hanging, tiling, platform display and real life dynamic show, but it has the disadvantages of high cost, low efficiency and low popularity. 3d virtual display takes virtual 3D clothing as the main body. By using a variety of hardware and software equipment for display, the color, style and details of clothing can be displayed from multiple angles, which has the advantages of high efficiency, wide audience and cost saving. At present, the virtual clothing display equipment is mainly computer, mobile phone display screen. When viewers watch the clothes through the display screen, they will have a visual sense of watching the three-dimensional clothes from the plane, and lack of depth; In holographic projection technology, the viewer can see the space from one side to the other without being limited by the equipment. Therefore, the combination of 3d virtual clothing and holographic projection technology can learn from each other and explore a new way of development for virtual clothing display. In recent years, with the continuous development of holographic projection technology, more and more researchers and research institutions have combined holographic projection technology with virtual clothing display through continuous exploration.

Dai Wencui uses holographic projection technology in the design of real clothing, and combines virtual holographic projection with real clothing, achieving a better design effect. However, by analyzing the development trend of garment display, it can be found that garment display method based on 3D virtual garment display technology has become the main development direction of garment display. However, the current virtual clothing display is still mainly display, lack of visual depth and three-dimensional sense of space. According to Yang si's research, compared with other holographic projection technologies, 360-degree holographic projection has the advantages of low cost and strong picture stability. Figure 1 is a schematic diagram of the "Pepper Illusion". Combined with the research present situation and the virtual clothing show defects, this paper puts forward the three-dimensional virtual clothing with 360 degrees of holographic projection technology combined with virtual clothing display method, in order to show and improve efficiency and reduce cost while enhance visual depth and space stereo feeling, and design based on mobile phone screen verifies the feasibility of the simple display device. The experimental process mainly includes three processes: the establishment of 3d virtual garment model, the production of projection source, and the design and production of display device.

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FIG. 1 schematic diagram of "Pepper's Illusion"

The building process of three-dimensional virtual garment model is referred to as garment modeling, which refers to the process of transforming two-dimensional plates into three-dimensional garments and dealing with fabric folds, fabric drape, fabric texture and accessories. Clothing modeling requires a lot of software, in the process of two-dimensional board to THREE-DIMENSIONAL clothing is commonly used software CLO 3D of South Korea, Germany's Vidya and so on. The static clothing obtained from clothing modeling can drive the movement of clothing by binding human bones.

Adobe Premiere video editing software is used to edit the video processed by 3DS Max software into four angles of projection source video: front, left, back and right. After many attempts in the experiment, the following points for attention in the production of projection source video are summarized:

-- The front, left, back and right angles of each frame of the projection source should have the same size and keep real-time synchronization;

-- The projection source video should take black as the background, so that the surrounding environment of the clothing in the pyramid holographic film is transparent;

The final projected source video is processed by Adobe Premiere video editing software into a horizontal flip state to ensure that the left and right directions of the virtual clothing in the projected pyramid hologram film are the same as the actual left and right directions.

The static data measurement in holographic clothing design adopts the static body-fitting measurement method to obtain the most accurate volumetric data, but the static data need to input the basic data of the human body, including standing posture and sitting posture; Dynamic data measured in the static data measured at the same time, under a state of action including the subjects, the size of the measurement data, including daily walk., stairs, squat, sat down to personal data and the relaxation of the dress, such as data after the measurement according to the dynamic data analysis to dynamic environment requirement, so that you can get customers contain movement range of the complete data, Finally, add the morning relaxation allowance to this part of the data.

In the holographic fashion design, there are two kinds of static fashion design and dynamic fashion design. Static fashion design refers to the design of the most suitable shape for the human body in the static state. Dynamic clothing design refers to the dressing effect designed according to personal data or specific consumption requirements under the requirements of regular sports; Static 3 d simulation refers to the static design input data into the computer simulation software, and then dress static effect of 3 d simulation, finally complete the static effect of dress design, 3 d dynamic simulation results is dynamic fashion design to enter data into the computer 3 d simulation software, complete the dynamic 3 d simulation results of simulation and production; After system treatment in the end of the big data through the network will be uploaded to the processing center, the experts will choose according to style, aesthetics, fashion trend, the respect such as colour collocation learning professional evaluation, the network terminal can evaluate online, for the customer to the online consultation, communication, feedback, these data will eventually judging by social psychology analysis on finished product. The invention and experiment of holographic clothing design were published on the network platform after the simulation results were obtained, and were highly evaluated by customers, garment experts and netizens. In the context of highly informationized and digitalized society, providing efficient and convenient personal design services to meet customer requirements is the real service purpose of clothing design. In the process of development, this holographic clothing design can be gradually promoted to the network and evolved into more recommended self-service services.  