计算焦深

The calculator below estimates the recommended maximum aperture (minimum \(f\)-number). This value should be used when adjusting settings for Zivid cameras, in order to stay within an acceptable level of blur. For what this recommended aperture means for image sharpness and point cloud quality, see 焦深.

How does the calculator work?

The calculator computes, for each end of the working-distance range, f_number = (abs(distance - focus_distance) / distance) * focal_length^2 / (circle_of_confusion * acceptable_blur_radius * (focus_distance - focal_length)), clamps each result to the camera's supported aperture range, and returns the larger of the two as the recommended minimum \(f\)-number. The example below uses this formula directly, with the camera's real focus distance, focal length, and circle of confusion, and an acceptable blur radius of 2 px (the calculator's default, chosen to keep blur within one Bayer block).

A Zivid 2+ R MR130 (focus distance 1300 mm, focal length 11 mm, circle of confusion 0.0039 mm) imaging between 1000 mm and 1600 mm has a recommended minimum f-number of approximately 3.6. This is driven by the 1000 mm near end: both ends are 300 mm from the focus distance, but the formula divides by distance, so the same 300 mm offset produces a larger f-number at the nearer, smaller distance.