Jiangxi short film shooting location

Jelly phenomenon appears on CMOS photosensitive elements (Panasonic LiveMOS is also based on CMOS technology). Data reading on CMOS chip is scanning the photosensitive film line by line. The first line at the top sweeps to the last line at the bottom. . . If the scanning speed is not fast enough, in the process of continuous exposure and continuous data reading of video shooting, the data obtained by the first line at the top and the last line at the bottom are out of sync, and the generated video image is distorted like jelly. Therefore, when using this kind of equipment to shoot video, try to keep the fuselage stable.

GH 1 has jelly, D90 has jelly, D5000 has jelly, and 5D2 has jelly. The degree of jelly depends on the circuit and image processing algorithm provided by the manufacturer to alleviate this problem.

The most serious phenomenon of jelly is the mobile phone camera. Shake the camera hard when you take a vertical pattern with your mobile phone. The result of shaking left and right is snake-shaped distortion, and the result of shaking up and down is stretching or compression. It was fun.

There is no jelly in CCD, because CCD reads the whole data together. However, it is precisely because all data are read from one channel at the same time that the data bottleneck problem appears in ccd technology. The standard definition era is good, and the amount of high-definition video data is large, so the data reading speed of a single CCD can't keep up. This also reveals the reason why Panasonic household DV insists on using 3ccd-to solve the reading speed, not the picture quality. Therefore, although Panasonic household small DV adopts 3ccd, its size is small, and the overall picture quality is not as good as that of Sony or Canon's large-area monolithic cmos.

In principle, professional equipment similar to photosensitive devices will also be jelly, but strict professional equipment will adopt high-cost technology to alleviate this phenomenon. Professional photographers generally try to avoid shaking shots. Whether there are technical defects or not, the vacillating lens is also very easy to produce visual disgust.