pcplayer

Visualize streaming 3-D point cloud data

Description

Visualize 3-D point cloud data streams from devices such as Microsoft^®Kinect^®.

To improve performance, pcplayer automatically downsamples the rendered point cloud during interaction with the figure. The downsampling occurs only for rendering the point cloud and does not affect the saved points.

You can set the default center of rotation for the point cloud viewer to rotate around the axes center or around a point. Set the default behavior from the Computer Vision Toolbox Preferences.

Creation

Syntax

player = pcplayer(xlimits,ylimits,zlimits)

player = pcplayer(xlimits,ylimits,zlimits,Name,Value)

Description

player = pcplayer(xlimits,ylimits,zlimits) returns a player with xlimits,ylimits, and zlimits set for the axes limits.

player = pcplayer(xlimits,ylimits,zlimits,Name,Value) returns a player with additional properties specified by one or more Name,Value pair arguments.

Input Arguments

xlimits — Range of x-axis coordinates

1-by-2 vector

Range of x-axis coordinates, specified as a 1-by-2 vector in the format [min max]. pcplayer does not display data outside these limits.

ylimits — Range of y-axis coordinates

1-by-2 vector

Range of y-axis coordinates, specified as a 1-by-2 vector in the format [min max]. pcplayer does not display data outside these limits.

zlimits — Range of z-axis coordinates

1-by-2 vector

Range of z-axis coordinates, specified as a 1-by-2 vector in the format [min max].pcplayer does not display data outside these limits.

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: 'VerticalAxisDir', 'Up'.

'MarkerSize' — Diameter of marker

6 (default) | positive scalar

Diameter of marker, specified as a positive scalar. The value specifies the approximate diameter of the point marker. MATLAB^® graphics defines the unit as points. A marker size larger than six can reduce the rendering performance.

'VerticalAxis' — Vertical axis

'Z' (default) | 'X' | 'Y'

Vertical axis, specified as 'X', 'Y', or 'Z'. When you reload a saved figure, any action on the figure resets the vertical axis to the z-axis.

'VerticalAxisDir' — Vertical axis direction

'Up' (default) | 'Down'

Vertical axis direction, specified as 'Up' or 'Down'. When you reload a saved figure, any action on the figure resets the direction to the up direction.

'Parent' — Axes on which to display the visualization

axes graphics object

Axes on which to display the visualization, specified as an Axes object. To create an Axes object, use the axes function. To display the visualization in a new figure, leave 'Parent' unspecified.

Properties

Axes — Player axes handle

axes graphics object

Player axes handle, specified as an axes graphics object.

Usage

Color and Data Point Values in Figure

To view point data or modify color display values, hover over the axes toolbar and select one of the following options.

Feature	Description
Datatip	Click Data Tips to view the data point values for any point in the point cloud figure. For a normal point cloud, the Data Tips displays the x,y,z values. Additional data properties for the depth image and lidar are: Point Cloud Data Data Value Properties Depth image (RGB-D sensor) Color, row, column Lidar Intensity, range, azimuth angle, elevation angle, row, column
Background color	Click Rotate and then right-click in the figure for background options.
Colormap value	Click Rotate and then right-click in the figure for colormap options. You can modify colornap values for the coordinate and range values available, depending on the type of point cloud displayed.
View	Click Rotate to change the viewing angle of the point cloud figure to the XZ, ZX,YZ, ZY, XY, or the YX plane. Click Restore View to reset the viewing angle.

OpenGL Option

pcplayer supports the 'opengl' option for the Renderer figure property only.

Object Functions

hide	Hide player figure
isOpen	Visible or hidden status for player
show	Show player
view	Display point cloud

Examples

Terminate a Point Cloud Processing Loop

Create the player and add data.

player = pcplayer([0 1],[0 1],[0 1]);

Display continuous player figure. Use the isOpen function to check if player figure window is open.

while isOpen(player) 
     ptCloud = pointCloud(rand(1000,3,'single'));
     view(player,ptCloud);           
end 

Terminate while-loop by closing pcplayer figure window.