2D Flash Exposure Mode
Several exposure modes can be used to acquire the 2D image. The Flash exposure mode can be used to acquire 2D images of proper brightness in a dark environment.
Besides, the 2D image acquired in the Flash exposure mode can help adjust the values of Exposure Multiplier and Exposure Time in the 3D Parameters category.
This chapter introduces the Flash exposure mode of different camera models and the method of adjusting 3D exposure settings with the assistance of the Flash exposure mode.
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Before reading this chapter, read Imaging Mechanism of Structured-Light Camera to learn about the imaging mechanism of structured light cameras. |
Flash Exposure Mode of Various Models
The Flash exposure mode varies across different camera models:
| Model | Related parameters | Description |
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DEEP, LSR S, LSR L, and LSR XL |
After the parameter in the left column is set to Flash, Flash Acquisition Mode will be displayed. The value Fast or Responsive can be selected. |
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NANO, NANO ULTRA, PRO XS, PRO S, and PRO M |
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Other models |
When the value of the parameter in the left column is set to Flash, the data acquisition method is the same as when Flash Acquisition Mode is set to Fast. |
The differences between the flash acquisition modes Fast and Responsive are as follows:
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Responsive: This mode works in a similar way to digital cameras. When this mode is selected, the camera adds supplemental light using the projector to capture a 2D image.
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Fast: When this mode is selected, the acquired 2D image is a part of 3D data. Specifically, the 2D image is the image acquired when the structured light without dark stripes is projected onto the target object. The effect of this mode is the same as the Fast mode. Both modes can acquire 2D images of proper brightness in a dark environment.
The 2D image acquired in the Fast flash acquisition mode can assist in adjusting the values of Exposure Multiplier and Exposure Time in the 3D Parameters category.
Assist in Adjusting 3D Exposure
To acquire 3D data, the camera exposes according to the values of Exposure Multiplier and Exposure Time set in the 3D Parameters category, and acquires the images containing the structured light distorted on the surface of the target object.
Since the 2D image acquired in the Fast flash acquisition mode is a part of the 3D data, it can be used to determine if the 3D exposure settings are proper and to assist in adjusting 3D exposure.
Follow the steps below to determine whether the 3D exposure settings are proper.
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Set the value of Exposure Multiplier in the 3D Parameters category to 1.
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Set the parameters listed in the table below in the 2D Parameters category according to the camera model in use.
Model Parameter Settings 2D image type DEEP, LSR S, LSR L, and LSR XL
Set 2D Image (Depth Source) Exposure Mode to Flash, and set Flash Acquisition Mode to Fast.
2D image (depth source)
NANO, NANO ULTRA, PRO XS, PRO S, and PRO M
Set Exposure Mode to Flash, and set Flash Acquisition Mode to Fast.
2D image
Other models
Set Exposure Mode to Flash.
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Click
in the data acquisition area to trigger one round of data acquisition, and then check the 2D image/2D images (depth source).-
If the brightness of the image is proper, the settings of 3D exposure are appropriate.
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If the image is too dark or too bright, the acquired 3D image can be underexposed or overexposed, resulting in data loss in the depth map and point cloud. Please adjust the 3D exposure settings.
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