CIDAR: Computational Imaging Detection and Ranging Challenge

The Computational Imaging Detection and Ranging (CIDAR) challenge aims to explore the potential of computational imaging tools and techniques to drastically enhance the accuracy of passive ranging for tactical and civil applications. 

Unlike active systems that emit detectable laser radiation, passive approaches are undetectable, resistant to jamming, and safer for use in intelligence, surveillance, and reconnaissance and sense-and-avoid operations. 

Challenge participants will leverage computational imaging, machine learning, and AI to develop algorithms capable of extending passive range measurements to 10 km or more with accuracy and low latency, rivaling active systems like light detection and ranging (LADAR) and laser rangefinder (LRF). 

Current passive methods use only ~1% of the potential distance information in images, but advancements could improve accuracy by up to 10–100x through the integration of multi-filter optical data. This in turn could redefine range measurement by providing more accurate, undetectable, and efficient alternatives to active systems, enhancing both tactical and civil capabilities. 

Tracking the CIDAR challenge

The CIDAR challenge launched in early 2025 with its first stage, during which teams submitted white papers outlining their approaches. As part of this phase, the top five submissions from small businesses and universities each received a $200,000 prize.

The semifinal phase is currently underway. Contestants have until early October to develop and submit their passive distance measurement results for the images provided. The CIDAR team will compare those results with ground truth data and award 10 semifinal prizes of $50,000 each.

In the final round, contestants will analyze a new set of images for a chance to win $1 million for first place, $600,000 for second, and $400,000 for third. The competition will conclude in February 2026, with the winners announced thereafter.

To learn more or follow along, visit the CIDAR challenge’s official website: cidar.darpa.mil.