fotofinishcameras

Fotofinish cameras, also called photo-finish cameras, are specialized high-speed imaging systems used to determine the exact order of finish in races at a finish line. They are designed to capture a moment so precise that even small differences in arrival times can be resolved, providing an objective basis for judging the outcome.

Most photofinish systems rely on line-scan or slit-scan sensors. A narrow vertical strip or slit crosses the finish line while the camera records a continuous image as time advances. The resulting photograph shows time on one axis and the lane positions or finish-line width on the other, so the moment each racer crosses the line appears as a distinct trace. Digital processing then identifies finish order and records precise timing data, often in conjunction with transponder timing and race clocks.

Historically, photofinish technology evolved from mechanical devices to digital systems during the 20th century. Modern implementations use high-speed digital cameras, stringent synchronization with timing systems, and robust lighting to minimize motion blur and glare. Advances include multiple camera angles, higher frame rates, and improved image analysis software to handle close finishes and occlusion.

Fotofinish cameras are widely used in track and field sprint finishes, horse racing, and various motor sports, as well as swimming in some contexts. They provide an objective record when judges face ambiguous finishes and are typically integrated with official timing data to determine results and records. While highly reliable, they rely on proper lighting, positioning, and calibration to ensure accurate outcomes.