Image usability in surveillance depends on pixel density and how well a camera captures detail for identification, recognition, or detection purposes. This white paper explains how resolution alone is not enough, as the number of pixels covering a target determines whether an object can be reliably identified. It introduces standards and guidelines for pixel density and scene coverage, helping users design systems that meet operational requirements. Factors such as distance, field of view, and camera placement are critical in achieving the right balance between coverage and detail, ensuring that surveillance footage is both useful and actionable in real-world scenarios.

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