showShape
Description
showShape(___,
specifies options using one or more name-value arguments in addition to the input arguments
from the previous syntax. For example, Name=Value
)Color="yellow"
sets the color for
the shapes to yellow.
Examples
Display Detected Objects in Image
Read an image into the workspace.
I = imread("visionteam1.jpg");
Create an aggregate channel features (ACF) people detector.
detector = peopleDetectorACF
detector = acfObjectDetector with properties: ModelName: 'inria-100x41' ObjectTrainingSize: [100 41] NumWeakLearners: 2048
Detect people in the image.
[bboxes,scores] = detect(detector,I);
Display the image with a labeled rectangle around each detected person. Display the associated detection score around each detected person.
figure imshow(I) labels = "person:" + scores; showShape("rectangle",bboxes,Label=labels)
Display Bounding Box Around Object in Point Cloud
Read point cloud data into the workspace.
ptCloud = pcread("teapot.ply");
Display the point cloud data.
figure pcshow(ptCloud) xlabel("X") ylabel("Y") zlabel("Z")
Define a cuboid and display it in green with an opacity of 0.5
.
pos = [0.3753 0 1.65 6 4 3 0 0 0]; showShape("cuboid",pos,Color="green",Opacity=0.5)
Visualize Cuboid Around Moving Object in Point Cloud Stream
Read point cloud data into the workspace.
ptCloud = pcread("teapot.ply");
Define a rotation matrix and 3-D transform to rotate the point cloud, and an associated cuboid, by 5 degrees.
rot = 5; R = [ cosd(rot) sind(rot) 0 0; ... -sind(rot) cosd(rot) 0 0; ... 0 0 1 0; ... 0 0 0 1]; tform = affine3d(R);
Compute the x and y rendered limits of the point cloud, to ensure that you do not clip the point cloud during rotation.
pcLimits = abs([ptCloud.XLimits ptCloud.YLimits]); maxLimit = max(pcLimits);
Add a margin to the plot to prevent the rotation from clipping the cuboid.
margin = 1; maxLimit = maxLimit + margin; xlimits = [-maxLimit maxLimit]; ylimits = [-maxLimit maxLimit]; zlimits = ptCloud.ZLimits;
Create a player for visualizing the point cloud.
player = pcplayer(xlimits,ylimits,zlimits);
Customize the player axes labels.
xlabel(player.Axes,"X (m)"); ylabel(player.Axes,"Y (m)"); zlabel(player.Axes,"Z (m)");
Define a cuboid around the point cloud.
cuboidPosition = [0.3753 0 1.65 6 4 3 0 0 0];
Define the output view for a cuboid rotation. Use the same limits as the player so that the view does not clip the cuboid. Then, display the rotated point cloud and cuboid.
gridSize = [1 1 1]; ref = imref3d(gridSize,xlimits,ylimits,zlimits); for i = 1:round((360/rot)) % Rotate the point cloud. ptCloud = pctransform(ptCloud,tform); % Rotate the cuboid. cuboidPosition = bboxwarp(cuboidPosition,tform,ref); % Show the rotated point cloud data. view(player,ptCloud) % Show the rotated cuboid. showShape("cuboid",cuboidPosition, ... Parent=player.Axes, ... Color="green", ... Opacity=0.5) % Use drawnow to synchronize the point cloud and shape visualizations. drawnow end
Input Arguments
shape
— Type of shape
"rectangle"
| "line"
| "polygon"
| "circle"
| "cuboid"
| "projected-cuboid"
| "ellipse"
Type of shape, specified as "rectangle"
,
"line"
, "polygon"
, "circle"
,
"cuboid"
, "projected-cuboid"
, or
"ellipse"
.
Data Types: char
position
— Positions and sizes of shapes
matrix | vector | cell array
Position of shape, specified according to the type of shape, as described in the table.
Shape | Position | Definition |
---|---|---|
rectangle | For one or more axis-aligned rectangles, specify as an M-by-4 numeric matrix, where each row specifies a rectangle of the form .
| |
For one or more rotated rectangles, specify in spatial coordinates as an M-by-5 numeric matrix, where each row specifies a rotated rectangle of the form [xctr yctr w h yaw].
| ||
cuboid | For one or more cuboids, specify in spatial coordinates as an M-by-9 numeric matrix where each row specifies a cuboid of the form [xctr yctr zctr xlen ylen zlen xrot yrot zrot], where
|
|
circle | For one or more circles, specify spatial coordinates as an M-by-3 numeric matrix, where each row specifies a circle of the form [xctr yctr radius].
| |
ellipse | For one or more ellipses, specify in spatial coordinates as an M-by-5 matrix, where each row specifies an ellipse of the form [xctr yctr major minor yaw]
|
|
| For one or more lines, specify spatial coordinates using one of these formats to specify a single line with connected endpoints, multiple lines with the same number of endpoints, or multiple lines with different numbers of endpoints.
| |
polygon | For one or more polygons, specify in spatial coordinates as an M-by-1 cell array, where each cell contains an L-by-2 matrix of [x y] vertex locations or a 1-by-2L vector of consecutive vertex locations of the form [x1, y1, x2,y2, … xL,yL ].
|
|
projected-cuboid | For one or more projected cuboids, specify in spatial coordinates as an 8-by-2-by-M array or an M-by-8 matrix, where M is the number of projected cuboids. When specified as an 8-by-2-by-M array, each row must contain the [x y] location of a projected cuboid vertex. The vertices connect to form a cuboid with six faces. The order of the input vertices must match the order shown in the diagram. When specified as an M-by-8 matrix, each row specifies the dimensions of the front-facing and rear-facing sides of a projected cuboid in the form, [x1 y1 w1 h1 x2 y2 w2 h2], where [x1 y1] and [x2 y2] specify the upper-left coordinates of the front-facing and rear-facing sides, respectively, and [w1 h1] and [w2 h2] specify the corresponding widths and heights. |
|
Name-Value Arguments
Specify optional pairs of arguments as
Name1=Value1,...,NameN=ValueN
, where Name
is
the argument name and Value
is the corresponding value.
Name-value arguments must appear after other arguments, but the order of the
pairs does not matter.
Example: showShape("rectangle",bboxes,Color="yellow")
sets the color
for the shapes to yellow.
Before R2021a, use commas to separate each name and value, and enclose
Name
in quotes.
Example: showShape("rectangle",bboxes,"Color","yellow")
sets the
color for the shapes to yellow.
Label
— Shape label
[]
(default) | scalar | M-element vector | M-element cell array of character vectors
Shape label, specified as a scalar, M-element vector, or an M-element cell array of character vectors, where M is the number of shapes.
If the input is a scalar value, then the function applies the label to each shape. If the input is an M-element vector or cell array, then the function applies the unique label to the corresponding shape, using the order in which you specify the shapes to the function.
Color
— Shape color
"green"
(default) | short color name | color name | vector of color names | three-column matrix of RGB triplets
Shape color, specified as a short color name, color name, vector of color names, three-column matrix of RGB triplets.
The supported colors table lists RGB intensities in the range [0, 1], but you must
specify RGB triplets in the range of your selected data type. For example, if
specifying this argument as a matrix of uint8
values, you must
convert each intensity value to the range [0, 255]. To convert the listed intensity
values to a uint8
data type, use the code
uint8(255*intensity)
, where intensity is an RGB triplet value
listed in the table.
You can specify a different color for each shape or one color for all shapes. To
specify one color for all markers, specify Color
as a color name
or an [R
G
B] vector.
Specification | Format | Example |
---|---|---|
Specify one color for all shapes (or markers) | Short color name or color name |
|
RGB triplet |
| |
Specify a color for each shape (or marker) | Vector of color names |
|
Three-column matrix of RGB triplets | [1 0 0 0 1 1 1 0 1 1 1 1] |
This table lists the supported shape colors.
Color Name | Short Name | RGB Triplet | Appearance |
---|---|---|---|
"red" | "r" | [1 0 0] | |
"green" | "g" | [0 1 0] | |
"blue" | "b" | [0 0 1] | |
"cyan" | "c" | [0 1 1] | |
"magenta" | "m" | [1 0 1] | |
"yellow" | "y" | [1 1 0] | |
"black" | "k" | [0 0 0] | |
"white" | "w" | [1 1 1] |
Data Types: logical
| uint8
| uint16
| int16
| double
| single
| cell
Opacity
— Opacity of shape fill
0
(default) | scalar in range [0 1] | M-element vector of values in range [0 1]
Opacity of the shape fill, specified as a scalar or M-element
vector of numeric values in the range [0 1], where M is the number
of shapes. To use the same opacity for all shapes, specify a scalar opacity value. For
a fully opaque shape fill, specify Opacity
as
1
.
Parent
— Output axes
gca
(default) | Axes
graphics object
Output axes, specified as an Axes
graphics object. For more
information on Axes object properties, see Axes Properties.
LineColor
— Shape border line color
"auto"
(default) | one or more RGB triplets | one or more color names or short color names
Shape border line color, specified as a short color name, color name, vector of color names, three-column matrix of RGB triplets.
The supported colors table lists RGB intensities in the range [0, 1], but you must
specify RGB triplets in the range of your selected data type. For example, if
specifying this argument as a matrix of uint8
values, you must
convert each intensity value to the range [0, 255]. To convert the listed intensity
values to a uint8
data type, use the code
uint8(255*intensity)
, where intensity is an RGB triplet value
listed in the table.
You can specify a different color for each shape or one color for all shapes. To
specify one color for all markers, specify LineColor
as a color
name or an [R
G
B] vector.
LineWidth
— Border line width
"auto"
(default) | positive scalar integer | M-element vector of positive integers
Border line width in pixels, specified as a positive integer or an M-element vector of positive integers, where M is the number of shapes. To use the same line width for all shapes, specify a scalar positive integer. Otherwise, specify an M-element vector of positive integers.
LineOpacity
— Border line opacity of shape
0
(default) | M-element vector of values in the range [0 1]
Border line opacity of shape, specified as a scalar or
M-element vector of numeric values in the range [0 1], where
M is the number of shapes. To use the same opacity for all
shapes, specify a scalar opacity value. For a fully opaque shape fill, specify
Opacity
as 1
.
LabelTextColor
— Label text color
"black"
(default) | one or more RGB triplets | one or more color names or short color names
Label text color, specified as a short color name, color name, vector of color names, three-column matrix of RGB triplets.
The supported colors table lists RGB intensities in the range [0, 1], but you must
specify RGB triplets in the range of your selected data type. For example, if
specifying this argument as a matrix of uint8
values, you must
convert each intensity value to the range [0, 255]. To convert the listed intensity
values to a uint8
data type, use the code
uint8(255*intensity)
, where intensity is an RGB triplet value
listed in the table.
You can specify a different color for each label or one color for all labels. To
specify one color for all markers, specify LabelTextColor
as a
color name or an [R
G
B] vector.
LabelOpacity
— Label opacity
0
(default) | M-element vector of values in the range [0 1]
Label opacity of shape, specified as a scalar or M-element
vector of numeric values in the range [0 1], where M is the number
of shapes. To use the same opacity for all labels, specify a scalar opacity value. For
a fully opaque shape fill, specify Opacity
as
1
.
LabelFont
— Label font
"Helvetica"
(default) | "FixedWidth"
| supported font
Label font, specified as "FixedWidth"
or a font that your
system supports. To display and print text properly, you must select a font that your
system supports. If you select an unsupported font, the function returns an error. If
you specify "FixedWidth"
, the function uses the font specified by
the FixedWidthFont
property of the Root Properties object. The fixed-width font relies on the value of
get(0,"FixedWidthFontName")
.
LabelFontSize
— Label font size
12
(default) | positive scalar
Label font size in points, specified as a positive scalar.
ShowOrientation
— Original orientation indicator
false
or 0
(default) | true
or 1
Original orientation indicator, specified as a numeric or logical
1
(true
) or 0
(false
). A value of 1
(true
) displays the original orientation of the rotated rectangle
by using an arrow annotation on the bounding box. The original orientation is defined
as a zero rotation angle. A value of 0
(false
)
does not show the arrow annotation.
This argument applies only when Shape
describes a rotated
rectangle or an ellipse.
Data Types: logical
| integer
Version History
Introduced in R2020bR2024b: Support for ellipse shape
Added support for "ellipse"
to visualize one or more ellipses on top
of an image or on video data.
R2024b: Default value for orientation indicator changed from true
to false
Starting in R2024b, the default value for the ShowOrientation
name-value argument will be false
.
R2023b: Rotated rectangle support for bounding box
You can specify a rotated rectangle bounding box using the form [xctr yctr width height yaw].
R2022b: Visualize projected cuboids
Added support to visualize projected cuboids.
R2022a: Bounding Box Coordinates: Data augmentation for object detection using spatial coordinates
The bboxresize
,
bboxcrop
,
bboxwarp
, and
showShape
functions assume the input bounding box coordinates for axis-aligned rectangles are
specified in spatial coordinates and return the transformed bounding boxes in spatial
coordinates.
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