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insertShape

Insert shapes in image or video

Description

example

RGB = insertShape(I,shape,position) returns a truecolor image with shape inserted. The input image, I, can be either a truecolor or grayscale image. You draw the shapes by overwriting pixel values.

example

RGB = insertShape(___,Name,Value) uses additional options specified by one or more Name,Value pair arguments.

Examples

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Read the image.

I = imread('peppers.png');

Draw a circle with a border line width of 5.

RGB = insertShape(I,'circle',[150 280 35],'LineWidth',5);

Draw a filled triangle and a filled hexagon.

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,'FilledPolygon',{pos_triangle,pos_hexagon},...
    'Color', {'white','green'},'Opacity',0.7);

Display the image.

imshow(RGB);

Figure contains an axes object. The axes object contains an object of type image.

Input Arguments

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Input image, specified in truecolor or 2-D grayscale.

Data Types: single | double | int16 | uint8 | uint16

Type of shape, specified as a character vector. The vector can be, 'Rectangle', 'FilledRectangle', 'Line', 'Polygon', 'FilledPolygon', 'Circle', or 'FilledCircle'.

Data Types: char

Position of shape, specified according to the type of shape, described in the table.

ShapePositionExample
'Rectangle'
'FilledRectangle'
For one or more rectangles, specify M-by-4 matrix where each row specifies a rectangle as [xywidthheight].

[x1y1width1height1x2y2width2height2xMyMwidthMheightM]

Two rectangles, M=2

'Line'

'Polygon'

'FilledPolygon'

For one or more disconnected lines, specify an M-by-4 matrix, where each four-element vector, [x1y1x2y2], describes a line with endpoints.

[x11y11x12y12x21y21x22y22xM1yM1xM2xM2]

The polyline always contains (L-1) number of segments because the first and last vertex points do not connect.

Two lines, M=2

For one or more polylines or polygons with the same number of vertices, specify an M-by-2L matrix, where each row is a vector, [x1y1x2y2...xLyL], of consecutive vertex locations, representing a polyline or a polygon with L number of vertices.

[x11y11x12y12x1Ly1Lx21y21x22y22x2Ly2LxM1yM1xM2yM2xMLyML]

Two polygons with equal number of vertices, M=2, L=5

For one or more polylines or polygons with unequal number of vertices, specify an M-by-1 cell array, where each cell contains an L-by-2 matrix of [x,y] vertices, or a 1-by-2L vector, [x1y1x2y2...xLyL], of consecutive vertex locations.

The value of L can be different for each cell element. For example,

{[x1y1x2y2],[x1y1x2y2x3y3]}

Two polygons with unequal number of vertices, M=2two polygons, one with 5 vertices and one with 4 vertices

'Circle'
'FilledCircle'
An M-by-3 matrix, where each row is a vector specifying a circle as [xyradius]. The [xy] coordinates represent the center of the circle.

[x1y1radius1x2y2radius2xMyMradiusM]

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64

Name-Value 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: 'Color','yellow' specifies yellow for the shape color.

Shape border line width, specified in pixels, as a positive scalar integer. This property only applies to the 'Rectangle', 'Line', 'Polygon', or 'Circle' shapes.

Data Types: uint8 | uint16 | int16 | double | single

Shape color, specified as the comma-separated pair consisting of 'Color' and either a character vector, cell array of character vector, or matrix. You can specify a different color for each shape, or one color for all shapes.

To specify a color for each shape, set Color to a cell array of color character vectors or an M-by-3 matrix of M number of RGB (red, green, and blue) color values.

To specify one color for all shapes, set Color to either a color character vector or an [R G B] vector. The [R G B] vector contains the red, green, and blue values.

Supported colors: 'blue', 'green', 'red', 'cyan', 'magenta', 'black','black', and 'white'.

Data Types: cell | char | uint8 | uint16 | int16 | double | single

Opacity of filled shape, specified as the comma-separated pair consisting of 'Opacity' and a scalar value in the range [0 1]. The Opacity property applies for the FilledRectangle, FilledPolygon, and FilledCircle shapes.

Data Types: double | single | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64

Smooth shape edges, specified as the comma-separated pair consisting of 'SmoothEdges' and a logical value of true or false. A true value enables an anti-aliasing filter to smooth shape edges. This value applies only to nonrectangular shapes. Enabling anti-aliasing requires additional time to draw the shapes.

Data Types: logical

Output Arguments

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Output image, returned as a truecolor image.

Extended Capabilities

Introduced in R2014a