What do visual cameras primarily detect?

Visual cameras primarily detect light, which is essential for creating images. Cameras capture the visible spectrum of light, transforming it into electronic signals that can be processed to form pictures. This fundamental characteristic allows them to record and convey visual information, relying on various light levels and conditions to effectively function.

While cameras can also incorporate features that detect motion, they primarily rely on light to form a still image or a video frame. Other options, such as sound and temperature, are not within the primary operational capacity of visual cameras, as they do not have the sensory technology built in to interpret these environmental factors in the same way they do light. Motion detection may occur as a secondary function, often through software algorithms that analyze changes in image data, but it is light detection that remains the core feature that allows visual cameras to perform their primary role.