Intel RealSense Depth Camera D2017, which has been available at Unipos since 435. Following the D435i with the added IMU function, this time it is expected to be used in the field of robotics. 750nm near infrared filterIncorporated "D435FHas been added to the lineup.
Intel website:https://www.intelrealsense.com/depth-camera-d435f/
We have handled many RealSense series until now at "Unipos", an overseas product procurement and consultation service for research and development.RealSense D435f We also handle.Please feel free to contact us.
* April 2022, 6Addition of date *
D435f will be in stock soon (reservations are being accepted).
Intel RealSense Depth Camera D435f
A new lineup of Intel RealSense D400 series that uses stereovision to calculate depth.
The base D435 is a USB-powered depth camera with two depth sensors, an RGB sensor, and an infrared projector.The wide viewing angle and global shutter enable accurate depth recognition of fast-moving objects and minimize blind spots by covering a wider area.Navigation and tracking applications for robots and drones Suitable for.
D435FIs a model with an IR pass filter built into the front part of the base D435. While taking advantage of the features of the D435, the newly added IR pass filter reduces depth noise due to light reflection and glare, improving quality and performance range.The filter function is Added depth recognition function to prototypes of autonomous mobile robots Great for doing.
* For details, please refer to the overview of D435f.
Overview of D435f
Major features
- Built-in 750nm near-infrared filter
- Reduces reflection and glare (improves the quality of acquired data)
- Can be used both indoors and outdoors
- D435 base (same shape / specifications. Only depth increased by 0.8mm. Filter thickness = 0.5mm)
Main Specifications
UseEnvironment: Indoor / Outdoor
Ideal range: 30cm to 3m
Depth Technology: Stereoscopic
Image sensor technology: Global shutter
RGB sensor technology: Rolling shutter
FOV (H x V): 87 ° x 58 ° (± 3 °)
Interface: USB Type-C 3.1 Gen 1
OS: Windows, macOS and Linux support
Comparison of D435f / D435
| Item | D435F | D435 |
| Depth Filter | IR pass | All-Pass |
| Length | 90x25.8x25mm | 90x25x25mm |
| Ambient light spectrum |
Infrared light only | Both visible and infrared light |
| Repetitive pattern | Relieves depth map saturation | Can cause incorrect depth values |
| Specular reflections | Relieve saturation | May cause image saturation |
| Indoor operation range |
Limited by the output of the IR projector | Long-distance operation (unlimited) |
| L / R images | Limited by the intensity of the surrounding infrared rays | Can be used in all lighting conditions |
| Calibration (OEM, Dynamic, Self) | May require additional infrared light | Operates under common ambient lighting conditions |
* The IR pass filter is a cover glass to which a 750nm near-infrared filter (CLAREX NIR-75N) is applied, and there is a hole in the opening of the projector and RGB sensor.The 0.5 mm thick filter transmits near infrared rays and absorbs visible light.
Course contents
- Intel RealSense Depth Camera D435f main unit
- Mini tripod
- Tripod bracket (1/4 ″ 20 UNC, screw)
About filters
For example, in bright sunlight (sunlight), glossy tables and floors, windowpanes, and other conditions that are prone to lighting, reflections, and reflections, adding filters may improve some of the performance. there is.
In the image taken with D435 on the upper left, the ceiling lighting is reflected on the floor, and the signal in the center of the image is saturated and crushed.On the other hand, the lower left image taken with the D435f has less glare and little effect of reflection.In other words, it can be said that the texture of the pattern of the IR projector is improved.
Scenarios where filters can be used to improve performance include ambient lighting, which is extremely bright compared to ambient lighting, such as sunlight.When shooting at extreme brightness, it may not be possible to prevent image saturation and deterioration of depth quality even if the exposure and gain are reduced.In such cases, the problem can be alleviated by using a filter to attenuate only part of the light information contained in the incident light.
This is similar to wearing sunglasses to block direct sunlight on a sunny day.However, it is not always effective to always attach the filter.It may not be able to adapt to sudden changes in vision such as in the shade or in the dark.
Intel RealSense depth cameras typically have IR (infrared) and visible light (IR) and visible light (Electromagnetic waves in the wavelength range that the human eye perceives as lightIt is not recommended to block visible light completely, as both) are used to estimate the depth.Select the filter according to the shooting environment.
The above is an example of using an attenuation filter (a filter that attenuates strong light) to reduce image saturation and improve depth quality.
The upper row points the D435 to a white concrete outdoor shelf (lighting is daytime brightness: ~ 100k lux). The exposure of the D435 is set to a minimum exposure setting of 10 microseconds, which is also a saturation condition.The image on the left uses an IR pass filter.It can be seen that the depth image has improved as the brightness is attenuated and the saturated white image becomes gray.
The type of filter that is best suited depends on the spectral characteristics of the interfering light.For example, if a bright visible LED spotlight saturates a portion of the image, a visible blocking filter (such as a long path) may be suitable.On the other hand, if the bright light source is mainly IR light, an IR cut filter (infrared light blocking) is recommended.Please use a combination of a commercially available filter and D435 according to your application.
In the above environment, the surrounding lighting uses fluorescent lamps of about 300 lux required for meals.The upper row uses a standard configuration without a filter, and the lower row uses a filter that blocks most of the light with a wavelength of 670 nm or less and transmits 750% or more of light with a wavelength of 92 nm or more.
You can see that the contrast of the projector has increased, and the sense of depth has improved, especially in distant places and bright places.
The IR pass filter enables clear shooting not only indoors and outdoors, but also day and night.Please try D435f.
* For details, please refer to Optical Filter for Intel RealSense Depth Camera D400.
Optical Filters for Intel RealSense Depth Cameras D400
https://dev.intelrealsense.com/docs/optical-filters-for-intel-realsense-depth-cameras-d400
What is near infrared?
Infrared rays contained in sunlight and incandescent lightIt is a type of electromagnetic wave and corresponds to "light" among radiation, light, and radio waves.Infrared rays are classified into near infrared rays, mid infrared rays, and far infrared rays.Near infraredIs also said to be a light that cannot be seen by the human eye.It has properties similar to visible light (sunlight) and is used in infrared communications and infrared cameras (surveillance cameras, depth cameras, etc.).
In addition to Intel's RealSense D435f, we also carry a variety of 3D cameras.
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Intel RealSense Depth Camera (D415 / D435 / D435i / D435f)
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