Static panorama-based virtual panorama production and application (2)

Second, the shooting and skills of virtual panoramic photos

Virtual panorama shooting is not complicated, but it also requires some skills. In article [1], Ms. Guo has described in detail the choice of lens, the choice of aperture and exposure, the choice of resolution, and other relevant knowledge. This article will combine his own work practices, introduce some shooting techniques and should pay attention to Matters that let you take wonderful photos at once.

(I) Preparation for shooting equipment

Digital Cameras: Although someone introduced the use of traditional cameras for taking panoramic photos, I believe that it is better to use digital cameras. In recent years, with the development of digital technology, digital cameras have basically been popularized, and the price is not too high. With a digital camera, you can eliminate the hassle of photographic processing, scanning, and technical processing of the scanned image. But when choosing a digital camera, make sure that you can take at least 640 x 480 resolution photos. The higher the resolution, the higher the quality of the shot. However, as the resolution increases, the larger the image you are splicing, the more the splicing workload increases.

Tripod: A tripod is one of the essential tools for taking panoramic photos. Due to the constant rotation of the camera during the shooting process, be sure to choose a firm and robust tripod.

Equatorial Mount: For virtual objects (such as cars, household appliances, equipment, etc.) that make physical objects, choose a platform that can be rotated. If you have conditions, you can purchase an equatorial mount directly; if you don't have a condition, you can create a platform that can be rotated so that you can directly virtualize some smaller objects and entities (I myself have made an “equator” that can hold 200 kilograms ,Very practical). For a large physical entity such as a car, if there is no equatorial mount, you can choose to rotate the shooting method, but pay attention to the angle of rotation should be uniform, shooting basically the same level. This will reduce the workload and improve the quality of the work when stitching.

Professional PTZ: If you have conditions, you can directly purchase a professional pan-tilt for panoramic photography to ensure the position level when shooting. If there is no condition, you can keep the level as much as possible during shooting, and do appropriate technical processing after splicing.

(B) the choice of shooting time

The best shooting time is 10-11am in the morning.

If you are taking outdoor photos, choose sunny days. If necessary, you can postpone the shooting time. It's better to do it better for the first time than to have to do it again because of improper operation.

If you are shooting indoors, try using the flash in a dark place. This is to keep the brightness and contrast of all images consistent with each other. This makes it easier to splice together when splicing.

(III) Selection of shooting methods

The way the panorama is shot depends on what you want. If you want a larger horizontal scene, you can take a horizontal rotation shot; if you want a larger vertical scene, you can take a portrait shot to get a larger vertical scene range.

(D) The choice of camera lens

There are a Variety of shots on the market today, which can be roughly divided into the following three categories:

Ordinary Linear Lens: This is a lens worn by an ordinary digital camera. The biggest advantage of such a lens is that the photos taken are very similar to the actual scene. The disadvantage is that more photos are taken, which increases the amount of stitching work.

Professional (ultra) wide-angle lens: This is a lens that professional digital cameras can wear. Because the lens has a large range of views, only a few photos are required to take the same panoramic view. However, the objects in the picture are smaller and the distance is farther than the actual ones. At the same time, the parts far away from the focus are slightly deformed and require technical processing during the splicing.

Special Fisheye Lens: This is a lens worn by a professional digital camera (such as Nikon). This lens is generally used when making spherical panoramas. Its greatest advantage is to make a spherical panorama that only requires two photos. However, this combination requires special software, and the camera and software are relatively expensive and are not suitable for general enthusiasts.

(e) Use correct shooting techniques

Different scenes require different shooting techniques.

1, take a 360 degree panoramic or partial angle scene (as shown in Figure 1)

The main point is: When standing in a fixed position during shooting, rotate clockwise and wait for the angle to rotate horizontally.

The angle of rotation can be determined as needed, approximately 10 degrees to 30 degrees. The smaller the angle of rotation, the more photographs are taken, but the smoother the image after stitching moves.

2, shooting a longitudinal partial panorama (as shown in Figure 2)

The point is: When standing in a fixed position during shooting, from top to bottom angle (rotation angle can be set according to need) shooting.

3, take a plane scene (shown in Figure 3)

The point is: shooting from left to right and at equal distances. Among them, "equal distance" includes the meaning that the distance between the camera and the object is as equal as possible and the translation distance is as equal as possible. This situation is generally used for photography of large and super-wide buildings or flat scenes that require horizontal display.

4. Virtual shooting of physical entities (as shown in Figure 4-1 and Figure 4-2)

For users who do not have conditions to purchase the equatorial mount, the method shown in Figure 4-1 can be used when photographing physical entities; when photographing physical entities for users who have purchased an equatorial mount, the method shown in Figure 4-2 can be used.

The main point is: If you take the method shown in Figure 4-1, you need to rotate around the object in a clockwise and equal angle; if you use the method shown in Figure 4-2, you need to rotate the platform (real object) at an angle counterclockwise.

After you take a photo, you can transfer the photo taken by your digital camera directly to your computer for storage.

Last but not least, remember that the more photos you take, the less "losing movie segments" that result, and the smoother the resulting virtual panorama moves.