zoom and dolly

[mo230761]

Hi, your paper is really impressive! I have a question regarding the use of the terms zoom in and zoom out. Normally, these refer to changes in focal length while the camera position remains fixed, causing the framing to change. However, I noticed that in your training setup, the data does not include camera focal length, but instead uses camera distance. In addition, the figures in your paper illustrating zoom in and zoom out show the camera physically moving. Wouldn’t this be more accurately described as a dolly movement rather than a zoom?