ToOpenCV

R2026b

Converts Simulink data types to OpenCV data types

• 

ToOpenCV block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Computer Vision Toolbox Interface for OpenCV in Simulink

Description

The ToOpenCV block converts the Simulink^® data types to Simulink OpenCV data types.

Examples

Smile Detection by Using OpenCV Code in Simulink

Build a smile detector by using the OpenCV Importer app. The detector estimates the intensity of the smile on a face image or a video. Based on the estimated intensity, the detector identifies an appropriate emoji from its database, and then places the emoji on the smiling face.

• Open Script

Convert RGB Image to Grayscale Image by Using OpenCV Importer

Convert an RGB image to a grayscale image by using the OpenCV Importer app. The converter converts an RGB image to a grayscale image by eliminating the hue and saturation information while retaining the luminance.

• Open Script

Draw Different Shapes by Using OpenCV Code in Simulink

Draw different shapes on images by using OpenCV Importer.

• Open Script

Ports

Inputs

Port_1 — Input signal

scalar | vector | matrix | simulink bus | simulink image

Input signal to the ToOpenCV block. The input can be of different data types. Each of the input data types determines the output data type of the block.

Data Types: uint8 | uint16 | int8 | int16 | int32 | single | double | Simulink.ImageType | CV_DMATCH_BUS | CV_RECT_BUS | CV_ROTATEDRECT_BUS | CV_TERMCRITERIA_BUS | CV_SIZE_BUS | CV_RANGE_BUS | CV_POINT2I_BUS | CV_POINT2F_BUS | CV_POINT2D_BUS | CV_POINT3I_BUS | CV_POINT3F_BUS | CV_POINT3D_BUS

Output

Port_1 — Output signal

scalar | vector | matrix | simulink bus | simulink image

Output signal from the ToOpenCV block. The output signal supports OpenCV types. For more information, see Mapping Input and Output Data Types.

Data Types: OpenCV types

Parameters

DataType — Data type of the Input signal of ToOpenCV block

input data type (default)

Specifies the input data type of the ToOpenCV block. The table lists the one-to-one mapping of the input versus output data types of the ToOpenCV block.

Programmatic Use

Block Parameter: DataType

Type: character vector

Value: input data type

Default: 'Point2i'

Block Characteristics

Data Types
Direct Feedthrough	Yes
Multidimensional Signals	Yes
Variable-Size Signals	No

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"opencvConverterBlockset/ToOpenCV"

Example: add_block("opencvConverterBlockset/ToOpenCV","myModel/myBlock",MakeNameUnique="on")

More About

Mapping of Input and Output Data Types

The table lists the one-to-one mapping of the input versus output data types of the ToOpenCV block.

DataType Parameter	ToOpenCV Block Output Signal Data Type	ToOpenCV Block Input Signal Data Type
Mat or Mat-Image	cv_Mat	uint8 array
		uint16 array
		int8 array
		int16 array
		int32 array
		single array
		double array
		Simulink.ImageType
Simulink.ImageType	cv_Mat	Simulink.ImageType
DMatch	cv_DMatch	CV_DMATCH_BUS
vector<DMatch>	vector_cv_DMatch	CV_DMATCH_BUS (1d array)
vector<vector<DMatch>>	vector_vector_cv_DMatch	CV_DMATCH_BUS (2d array)
Rect	cv_Rect	CV_RECT_BUS
vector<Rect>	vector_cv_Rect	CV_RECT_BUS (1d array)
RotatedRect	cv_RotatedRect	CV_ROTATEDRECT_BUS
vector<RotatedRect>	vector_cv_RotatedRect	CV_ROTATEDRECT_BUS (1d array)
TermCriteria	cv_TermCriteria	CV_TERMCRITERIA_BUS
Scalar	cv_Scalar	double array
Size	cv_Size	CV_SIZE_BUS
Range	cv_Range	CV_RANGE_BUS
Point	cv_Point	CV_POINT2I_BUS
Point2f	cv_Point2f	CV_POINT2F_BUS
Point2d	cv_Point2d	CV_POINT2D_BUS
Point3i	cv_Point3i	CV_POINT3I_BUS
Point3f	cv_Point3f	CV_POINT3F_BUS
Point3d	cv_Point3d	CV_POINT3D_BUS
vector<Point>	vector_cv_Point	CV_POINT2I_BUS (1d array)
vector<Point2f>	vector_cv_Point2f	CV_POINT2F_BUS (1d array)
vector<Point2d>	vector_cv_Point2d	CV_POINT2D_BUS (1d array)
vector<Point3i>	vector_cv_Point3i	CV_POINT3I_BUS (1d array)
vector<Point3f>	vector_cv_Point3f	CV_POINT3F_BUS (1d array)
vector<Point3d>	vector_cv_Point3d	CV_POINT3D_BUS (1d array)
vector<vector<Point>>	vector_vector_cv_Point	CV_POINT2I_BUS (2d array)
vector<vector<Point2f>>	vector_vector_cv_Point2f	CV_POINT2F_BUS (2d array)
vector<vector<Point2d>>	vector_vector_cv_Point2d	CV_POINT2D_BUS (2d array)
vector<vector<Point3i>>	vector_vector_cv_Point3i	CV_POINT3I_BUS (2d array)
vector<vector<Point3f>>	vector_vector_cv_Point3f	CV_POINT3F_BUS (2d array)
vector<vector<Point3d>>	vector_vector_cv_Point3d	CV_POINT3D_BUS (2d array)

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2020a