Community Profile

photo

Qu Cao

Last seen: 1 giorno fa Attivo dal 2016

Statistics

  • Knowledgeable Level 4
  • Knowledgeable Level 3
  • 3 Month Streak
  • Revival Level 3
  • First Answer

Visualizza badge

Content Feed

Visto da

Risposto
How to construct stereoParameters with intrinsic and extrinsic matrix?
poseCamera2 essentially transforms camera 2 to camer 1. If you have “the transaltion and rotation from camera1 to camera 2”, (le...

8 giorni fa | 1

Risposto
Object 3D world coordinates from multiple images
You will need a stereo camera to give you the actual dimension of 3-D objects. Alternatively,if you know the size of an object...

circa un mese fa | 0

Risposto
creating a bag of features for new image set for monocular SLAM
The bag-of-features data may not work for the KITTI dataset because it was trained using a small amount of image data. You may w...

circa un mese fa | 1

| accettato

Risposto
The Premultiply Convention in Geometric Transformations does not support C/C++ code generation?
Thank you for reporting this. There is a bug in the documentation. All the geometric transformation objects with the premultiply...

circa un mese fa | 0

| accettato

Risposto
How to use reconstructScene with a disparity map from file, without calling rectifyStereoImages ?
You can use the reprojectionMatrix output from rectifyStereoImages to do the reconstruction. Otherwise, you need to save the ste...

3 mesi fa | 0

| accettato

Risposto
Match the coordinate systems of "triangulate" and "reconstructScene" with "disparitySGM"
The point cloud generated from reconstructScene is in the rectified camera 1 coordinate. Starting in R2022a, you can use the ad...

3 mesi fa | 0

| accettato

Risposto
MATLAB Simulate 3D Camera: why is there no focal length (world units) attribute in the sensor model?
Please take a look at this page: https://www.mathworks.com/help/vision/ug/camera-calibration.html#bu0ni74 If you know the size...

6 mesi fa | 0

Risposto
How to port SLAM algorithm to embedded platform?
Unfortunately, as of R2022a the visual SLAM pipeline doesn't support code generation yet. We're actively working on this suppopr...

6 mesi fa | 1

| accettato

Risposto
how to get the relative camera pose to another camera pose?
Note that the geometric transformation convention used in the Computer Vision Toolbox (CVT) is different from the one used in th...

7 mesi fa | 1

| accettato

Risposto
How to get 3D world coordinates from 2D image coordinates?
You should use the rectified stereo images. The disparityMap computed from disparitySGM should have the same size as your stereo...

9 mesi fa | 0

Risposto
Creating a depth map from the disparity map function
You can use reconstructScene for your workflow.

9 mesi fa | 0

Risposto
Unable to use functions from the Computer Vision Toolbox in Simulink MATLAB function block
A workaround is to declare the function as an extrinsic function so that it will be essentially executed in MATLAB: https://www...

10 mesi fa | 0

| accettato

Risposto
how to get texture extraction using LBP features in MATLAB?
You can use the extractLBPFeatures function.

circa un anno fa | 0

Risposto
About error of helperVisualizeMotionAndStructureStereo
In helperVisualizeMotionAndStructureStereo.m, please note the following code in retrievePlottedData which discards xyzPoints out...

circa un anno fa | 1

Risposto
About SLAM initial Pose data
The initial pose data is provided by the dataset. It's used to convert the 3-D reconstruction into the world coordinate system. ...

circa un anno fa | 0

Risposto
About "slam" on my camera device
The example shows how to run stereo visual SLAM using recorded data. It doesn't support "online" visual SLAM yet, meaning that y...

circa un anno fa | 0

Risposto
Is Unreal Engine of the Automated Driving Toolbox available on Ubuntu?
As of R2021a, only Windows is supported. See Unreal Engine Simulation Environment Requirements and Limitations.

oltre un anno fa | 1

Risposto
why we use Unreal engine when there is a 3D visualization available in Automated driving toolbox?
It's not just used for visualization. With Unreal, you can configure prebuilt scenes, place and move vehicles within the scene, ...

oltre un anno fa | 0

| accettato

Risposto
About running a stereo camera calibrator
In general, you can use any type of stereo camera and calibrate its intrinsic parameters using the Stereo Camera Calibrator. You...

oltre un anno fa | 0

Risposto
How to obtain optimal path between start and goal pose using pathPlannerRRT() and plan()?
Please set the random seed at the beginning to get consistent results across different runs: https://www.mathworks.com/help/mat...

oltre un anno fa | 0

| accettato

Risposto
Does vehicleCostmap this type of map only support pathPlannerRRT object to plan a path? Can I use another algorithm to plan a path?
You can create an occupancyMap object from a vehicleCostmap object using the following syntax: map = occupancyMap(p,resolution)...

oltre un anno fa | 0

Risposto
Defining a ROI for feature extraction rather than rectangle
Unfortunately, rectangle is the only type of ROI supported. As a workaround, you can define multiple ROIs in your image to cover...

oltre un anno fa | 1

Risposto
Monocular Visual Simultaneous Localization and Mapping Error: Dot indexing is not supported for variables of this type.
The example has been updated over the past few releases. For 20b version, please check the following documentation: https://www...

oltre un anno fa | 0

| accettato

Risposto
How can I store the feature descriptors for all 3D points found in Structure from Motion?
You can use imageviewset to store the feature points associated with each view and the connections between the views. You can al...

oltre un anno fa | 0

Risposto
How to use "triangulateMultiview" to reconstruct the same world coordinate point under multiple different views?
triangulateMultiview requires both camera poses and intrinsic parameters inputs to compute the 3-D world positions corresponding...

oltre un anno fa | 0

| accettato

Risposto
imageviewset() not returning an imageviewset object
imageviewset is introduced in R2020a. If you are not able to upgrade to 20a, you can use viewSet as a workaround.

circa 2 anni fa | 0

Risposto
How to ensure that the number of matches between 2 images is equal to the number given?
You can set 'MatchThreshold' to 100 and 'MaxRatio' to 1.

circa 2 anni fa | 0

| accettato

Risposto
Undefined function 'estimateGeomerticTransform' for input arguments of type 'SURFPoints'.
There is a typo in your code, estimateGeomerticTransform should be estimateGeometricTransform.

circa 2 anni fa | 0

Risposto
How do I find 3D coordinates from stereo picture pair?
You can use reconstructScene function to compute the 3-D world points from a disparity map. Then, you can query the 3-D coordina...

oltre 2 anni fa | 0

Risposto
RRT navigation toolbox and automated driving toolbox also costmap from driving scenario
1) plannerRRT in Navigation Toolbox is a generic motion planner where you can define the state space. pathPlannerRRT in Automate...

oltre 2 anni fa | 0

Carica altro