insertShape
Insert shapes in image or video
Description
specifies options using one or more name-value arguments in addition to the input
arguments from the input arguments from the previous syntax. For example,
RGB
= insertShape(___,Name=Value
)LineWidth=5
sets the line width value to 5
of the
inserted shapes.
Examples
Insert Circle and Filled Shapes onto Image
Read an image into the workspace.
I = imread("peppers.png");
Place a circle on the image with a border line width of 5 pixels.
RGB = insertShape(I,"circle",[150 280 35],LineWidth=5);
Place a filled triangle and a filled hexagon on the image.
pos_triangle = [183 297 302 250 316 297]; pos_hexagon = [340 163 305 186 303 257 334 294 362 255 361 191]; RGB = insertShape(RGB,"filled-polygon",{pos_triangle pos_hexagon}, ... ShapeColor=["white","green"],Opacity=0.7);
Display the resulting image.
imshow(RGB)
Input Arguments
I
— Input image
M-by-N-by-3 truecolor image | M-by-N grayscale image
Input image, specified as an M-by-N-by-3 truecolor or an M-by-N grayscale image.
Data Types: single
| double
| int16
| uint8
| uint16
shape
— Type of shape
"rectangle"
| "filled-rectangle"
| "line"
| "polygon"
| "filled-polygon"
| "circle"
| "filled-circle"
| "projected-cuboid"
| "ellipse"
| "filled-ellipse"
Type of shape, specified as "rectangle"
,
"filled-rectangle"
, "line"
,
"polygon"
, "filled-polygon"
,
"circle"
, "filled-circle"
,
"projected-cuboid"
, "ellipse"
, or
"filled-ellipse"
.
Data Types: char
| string
position
— Position of shape
matrix | vector | cell array
Position of shape, specified according to the type of shape, as described in the table.
Shape | Position | Definition |
---|---|---|
| For one or more axis-aligned rectangles or filled 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].
| ||
| 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].
| |
| 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.
| |
| 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. |
|
Data Types: single
| double
| cell
| int8
| int16
| int32
| int64
| uint8
| uint16
| uint32
| uint64
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: insertShape(I,"circle",position,Color="yellow")
sets the
shape color to yellow.
Before R2021a, use commas to separate each name and value, and enclose
Name
in quotes.
Example: insertShape(I,"circle",position,"Color","yellow")
sets the
shape color to yellow.
LineWidth
— Shape border line width
1
(default) | positive integer
Shape border line width, specified as a positive integer, in pixels. This argument applies to
only the "Rectangle"
, "Line"
,
"Polygon"
, and "Circle"
shapes.
Data Types: uint8
| uint16
| int16
| double
| single
ShapeColor
— 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 ShapeColor
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 filled shape
0.6
(default) | scalar in range [0,1]
Opacity of a filled shape, specified as a scalar in the range [0 1]. The
Opacity
argument applies to only the
"filled-rectangle"
, "filled-polygon"
, and
"filled-circle"
shapes.
Data Types: double
| single
| int8
| int16
| int32
| int64
| uint8
| uint16
| uint32
| uint64
SmoothEdges
— Smooth shape edges
true
or 1
(default) | false
or 0
Smooth shape edges, specified as a logical 1
(true
) or
0
(false
). A true
value
enables an antialiasing filter to smooth shape edges. This value applies to only
nonrectangular shapes. When you enable antialiasing requires additional time to draw
the shapes.
Data Types: logical
Output Arguments
RGB
— Output image
M-by-N-by-3 truecolor image
Output image, returned as an M-by-N-by-3 truecolor image.
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.
Usage notes and limitations:
The input argument
shape
must be a compile-time constant.The
ShapeColor
andSmoothEdges
name-value arguments must be compile-time constants.Code generation requires a C++ compiler. For a list of supported compilers, see Supported and Compatible Compilers
Version History
Introduced in R2014aR2024b: Support for ellipse shape
Added support for "ellipse"
and "filled-ellipse"
to visualize one or more ellipses on top of an image or on video data.
R2023b: Specify RGB color in the range [0,1]
Starting in R2023b, you can specify marker color with RGB values in the range [0,1].
R2023b: Rotated rectangle support for bounding box
You can specify a rotated rectangle bounding box using the form [xctr yctr width height yaw].
R2023b: Show orientation of rectangle of bounding box
You can now specify the ShowOrientation
name-value argument to
display the orientation and angle of a rotated rectangle bounding box.
R2022b: Visualize projected cuboids
Added support to visualize projected cuboids.
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