Metashape can be used for automatic lens calibration that helps to ensure those lens distortions are well simulated by the camera model used in the software. The calibration target acceptable in Metashape is a chessboard pattern on LCD screen, alternatively, a printed chessboard pattern can be used providing that it is flat and all its cells are squares. Lens calibration procedure supports estimation of the full camera calibration matrix, including non-linear distortion coefficients.

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For each detected corner the reprojection error is displayed: it characterizes the difference between the detected corner position and its' position estimated according to the calculated calibration. The errors are scaled x20 times for display.

The detected corners are marked with red, blue, and gray points. Red and blue points are used for calibration, while gray points are not. It is important that each color point has points of a different color as its nearest neighbors.

3. Use your camera to capture a series of photos of the displayed calibration pattern from slightly different angles (follow the guidelines outlined below). The minimum number of photos for a given focal length is 3.

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5. The calibration results will appear on the Adjusted tab of the Camera Calibration dialog available from the Tools menu (Tools > Camera Calibration...).

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4. To protect the calibration data from being refined during Align Photos process on the Initial tab use Select... button for the option Fixed parameters: in the Fixed parameters dialog window choose Check all box (alternatively you may select only those parameters that you want to be preserved during alignment procedure). Thus initial calibration values will not be changed during the alignment processing step.

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5. Press OK button to confirm and proceed with the general workflow starting with the Align Photos step. You may find the information about workflow in Metashape in this solution

LTCLHP CORE PLUS lights have been designed for smart integration. They feature a built-in mounting flange so no additional clamps are required.

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The length and working distance of a telecentric lens strongly impact the size of a vision system. Their working distance range has been optimized to make a measurement system as compact as possible, allowing to reduce the overall system’s dimensions by up to up to half.

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The super compact form factor allows you to easily integrate CORE PLUS collimated illumination where classic telecentric lights don’t fit instead of common diffuse backlights, thus improving your system’s performance.

For aerial photography, we recommend that you calibrate the camera on the reference site using ground control points. In case you're using the approach described in this article make sure that your lens is focused on infinity.

To build a telecentric measurement setup it’s necessary to position a LTCLHP CORE telecentric illuminator upside down with respect to the TC CORE PLUS telecentric lens.

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LTCLHP CORE PLUS telecentric illuminators are designed to illuminate large areas in a reduced space. They are up to 40% shorter than other telecentric lights on the market.

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3. Browse to the folder containing the photos of the calibration pattern and select files to be used. Then click Open button.

4. The progress dialog box will appear displaying the current processing status. To cancel processing click the Cancel button.

After you have saved the calibration parameters for the lens, you may proceed with the workflow steps in a separate chunk (or in a separate project) for an actual dataset captured with the same camera and lens.

3. Load calculated camera calibration parameters. For the purpose open Camera Calibration dialog from the Tools menu and use Load button on the Initial tab.

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1. Open Camera Calibration dialog available from the Tools menu (Tools > Camera Calibration...) and make sure that Camera Type setting corresponds the lens to be calibrated. Use Fisheye value for fisheye lens and Frame camera for prime lens or zoom lens.

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1. Create a new chunk in the current project (where the camera calibration procedure had been performed) or open/create a project.

Use Save button on the Adjusted tab to save the adjusted values for camera calibration parameters to file. The saved lens calibration data can later be used in another chunk or project for the actual dataset captured with the same camera and lens.

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We recommend following this approach for close-range capturing scenarios. It is preferable that the images of the calibration board are taken with the same distance from the camera as the planned distance to the object for 3D reconstruction.

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Once the calibration procedure is completed it will be possible for you to observe the detected chessboard corners on each photo (the photo can be opened by double-clicking on its name in the Photos pane). The majority of the corners should be detected correctly, if not - we recommend to collect a new set of calibration images and re-run the procedure.

LTCLHP CORE PLUS telecentric illuminator is also a perfect solution when coupled with classic telecentric lenses (e.g. TC series).

2. Scale the calibration pattern so that the number of squares on each side of the screen would exceed 10. Use mouse scroll wheel to zoom in/out the calibration pattern.

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1. Create a new chunk using Add Chunk toolbar button on the Workspace pane or selecting Add Chunk command from the Workspace context menu (available by right-clicking on the root element on the Workspace pane).