How to calibrate cameras which are completely facing towards each other as in figure? - camera-calibration

I know how to calibrate a single camera and a stereo camera.
But I am not sure how to calibrate when two cameras are facing towards each other as in the below figure.
For my application, I am using two Intel Realsense cameras.
Thank you for your suggestions.

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Using ARCore for Measurment

I would like to know if it is possible to measure the dimensions of an object by just pointing the camera at the object without moving the camera from left to right like we do in Google Measurement.
A depth map cannot be calculated from just a 2D camera image. A smart phone does not have a distance sensor but it does have motion sensors, so by combining the movement of the device with changes in the input from the camera(s), ARCore can calculate depth. To put it simply, objects in close to the camera move around on screen more, compared to objects further away.
To get depth data from a fixed position would require different technologies than found on current phones, such as LiDAR or an infrared beam projector and infrared camera.

Wide FOV and Large Baseline Fisheye stereo cameras rectification

Iam working on Fisheye stereo cameras, I can't Rectify the cameras for stereo correspondence due to the presence of vegetation and the large baseline between the cameras which make the task particularly challenging. The FOV is 210 degrees and baseline is 0.59m I posted Left and Right image of the same scene with the cameras,
Left Image Right Image
I've tried OpenCV-Fisheye model and openCv-Omnidirectional model, none of them worked, the output images were not rectified.
Should the Omnidirectional model work?
Is it even possible to calibrate the cameras together?

Kinect v2 Color Camera Calibration Parameters

I am looking for camera calibration parameters of Kinect V2 color camera. Can someone provide these parameters or any reference?
I know that the camera calibration parameters are lens specific but I am fine with default parameters which Kinect v2 is using.
As always, thank you very much.
Each kinect's calibration values are differ by small margins. if you do very precise calculations on them, you will need to calibrate your kinect with a chess board using opencv. Otherwise you can use following values. I calibrated myself.
All the Kinect v2 calibration parameters

Is it possible to use Tango fisheye camera and rgb sensor at the same time?

As far as I researched, it seems that it is not possible to use the Tango fisheye camera and the rgb sensor at the same time.
Thus is it possible to take a color picture with the fisheye camera on Tango?
It is not possibile to take color picture with the fisheye simply because RGB camera and fisheye camera are two different hw devices as you can see here

Getting coordinates and depth data of the point on video overlay using Project Tango

I'm looking to capture the coordinate data on the video overlay in project tango much similar to how measureit does it. How is this done?

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