AI顔追跡とスマートリフレーミングによる縦型動画変換

MicrocosmWorks implemented a hybrid tracking approach that combines a lightweight face detector running every 5th frame with a KCF optical flow tracker for inter-frame predictions. When occlusion is detected via confidence score drops, the system maintains the last known trajectory with Kalman filtering and re-acquires the face within 200ms of it becoming visible again.

MicrocosmWorks built a saliency-weighted cropping algorithm that prioritizes detected faces, then text regions, then motion areas when determining the 9:16 crop window position. For multi-person scenes, the system uses a configurable priority ranking, defaulting to the active speaker or the largest face, with smooth interpolation between crop positions to avoid jarring shifts.

Yes, MicrocosmWorks implemented a fallback saliency detection mode that activates when no faces are present, using a combination of motion detection, visual attention modeling, and mouse cursor tracking for screen recordings. The system intelligently follows the most relevant content region even in purely visual or text-based footage.

MicrocosmWorks optimized the pipeline for batch workflows, achieving 8x real-time processing speed on a single NVIDIA T4 GPU, meaning a 10-minute video is reframed in approximately 75 seconds. The system supports parallel processing across multiple GPUs, scaling linearly for high-volume content operations.

MicrocosmWorks develops AI video reframing systems at rates of $25-$45/hr, with a full face tracking and smart reframing solution including model optimization, batch processing support, and API integration typically requiring 350-550 development hours. This investment eliminates the need for manual reframing editors, which typically cost $5-$15 per video.