Hi ! I have tried to measure the width of chessboard by using Zed 2. My chessboard is 8x6 at 6 meters away with the width 8cm, and it can be measured with the (mean, std) = (7.890 cm, 0.38212 cm). But when I put the chessboard at 7 meters away, I get the data is (mean, std) = (8.7189 cm, 1.3465 cm) . And the point cloud is not a plane.
Following is my setting
init_params.camera_fps = 30 # Set fps at 30
init_params.depth_mode = sl.DEPTH_MODE.ULTRA # Use PERFORMANCE depth mode
init_params.coordinate_units = sl.UNIT.METER # Use meter units (for depth measurements)
init_params.depth_stabilization = True
init_params.depth_minimum_distance = 3.0
init_params.depth_maximum_distance = 10.0
runtime_parameters = sl.RuntimeParameters()
runtime_parameters.enable_fill_mode = True
Should I need to recalibration or setting another parameter?
This to use NEURAL depth mode: init_params.depth_mode = sl.DEPTH_MODE.NEURAL # Use PERFORMANCE depth mode
and raise the depth stabilization init_params.depth_stabilization = 50
Do not enable fill mode for depth measurement tasks: runtime_parameters.enable_fill_mode = False
The chessboard is far from the camera and the texturization is not good (repetitive and poor in visual features) to extract a point cloud of the surface in such conditions.
This can be caused by the frequency of the artificial illumination.
How far is the chess board from the camera? What are the sizes?
How far is the chess board from the camera? Ans : About 8m.
What are the sizes? Ans: Each grid width is 8cm and the pattern is 80 cm x 60 cm.
But Zed 2 in spec says the depth range can achieve 20m.
The depth precision is about 1% for the measured depth value in optimal conditions, so you can expect an error of ~8 cm at 8 m of distance with a good texturized surface.
In your case, the chessboard does not provide good visual features, so the expected error can be higher than 1%.
A curiosity, did you perform a manual calibration of the camera?
Hi @Myzhar ! Sorry too late for your response, because my expernment envienment need to be changed recently. But it still has the same problem. So I also record the SVO. Following is the chessboard expernment condition.
