Which of these involves combining visual elements from separate sources into a single image?

Interlacing is a video scanning method that alternates between odd and even scan lines to improve perceived motion, not a technique for merging images from separate sources.

Compositing is the process of layering and merging visual elements from separate sources - such as video feeds, graphics overlays, or CGI renders - into one cohesive output image. It is a foundational technique in broadcast production, film post-production, and real-time video systems. Unlike other processing methods, compositing is specifically defined by the act of integrating distinct visual inputs into a single frame.

Video conferencing is a real-time audio/video communication technology for remote collaboration, not a visual composition or image-merging technique.

Interleaving is a data transmission or storage technique that intersperses segments from multiple streams to improve error tolerance or throughput, not a visual combination process.