Community Profile

photo

Qu Cao

Last seen: 15 dagen ago Active since 2016

Statistics

  • Knowledgeable Level 3
  • 3 Month Streak
  • Revival Level 3
  • Knowledgeable Level 2
  • First Answer

View badges

Content Feed

View by

Answered
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...

3 maanden ago | 0

Answered
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...

3 maanden ago | 1

| accepted

Answered
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...

3 maanden ago | 1

| accepted

Answered
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...

6 maanden ago | 0

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

6 maanden ago | 0

Answered
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...

7 maanden ago | 0

| accepted

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

9 maanden ago | 0

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

9 maanden ago | 0

Answered
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. ...

10 maanden ago | 0

Answered
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...

10 maanden ago | 0

Answered
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.

12 maanden ago | 0

Answered
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, ...

12 maanden ago | 0

| accepted

Answered
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...

ongeveer een jaar ago | 0

Answered
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...

ongeveer een jaar ago | 0

| accepted

Answered
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)...

ongeveer een jaar ago | 0

Answered
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...

meer dan een jaar ago | 1

Answered
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...

meer dan een jaar ago | 0

| accepted

Answered
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...

meer dan een jaar ago | 0

Answered
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...

meer dan een jaar ago | 0

| accepted

Answered
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.

meer dan een jaar ago | 0

Answered
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.

meer dan een jaar ago | 0

| accepted

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

bijna 2 jaar ago | 0

Answered
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...

bijna 2 jaar ago | 0

Answered
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...

bijna 2 jaar ago | 0

Answered
helperTrackLocalMap error with Monocular SLAM
Answer pasted from comments: Please try tunning the parameters to see if it helps improve the robustness: In helperIsKeyFrame,...

bijna 2 jaar ago | 0

Answered
Why is the pointsToWorld back-projection inverted?
You may need to convert the camera world pose to extrinsics using cameraPoseToExtrinsics: [worldOri,worldLoc] = estimateWorld...

ongeveer 2 jaar ago | 3

| accepted

Answered
rectangle instead of square for camera calibration
Unfortunately, this function does not support rectangle patterns.

ongeveer 2 jaar ago | 0

Answered
How to calculate fisheye intrinsics?
You can use undistortFisheyeImage function to produce a "virtual perspective" camera intrinsics, which is the format you need. S...

ongeveer 2 jaar ago | 1

| accepted

Answered
How can I find a diameter of cylindrical 3D point cloud in MATLAB?
https://www.mathworks.com/help/vision/ref/pcfitcylinder.html

ongeveer 2 jaar ago | 0

Answered
Function estimateWorldCameraPose() or extrinsics() for fisheyeParameters is missing. Is it possible to change these functions for fisheye?
fisheyeIntrinsics can't be used directly. Instead, you can use undistortFisheyeImage function to produce both undistorted image ...

ongeveer 2 jaar ago | 3

| accepted

Load more