Matrix To Image

Converts matrix data to Simulink image data

Since R2021b

• 

Libraries:
Computer Vision Toolbox OpenCV Interface for Simulink

Description

The Matrix To Image block converts matrix data to Simulink^® image data.

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

Shadow Detection by Using OpenCV Code in Simulink

Detect shadows in a recorded video by using the OpenCV Importer app.

• Open Script

Ports

Input

Port_1 — Input signal

matrix

Input signal to the Matrix To Image block. The input is a numerical matrix.

Data Types: uint8 | uint16 | int8 | int16 | single | double

Output

Port_1 — Output signal

Simulink.ImageType

Output signal from the Matrix To Image block. The output is an image in Simulink.ImageType data type.

Data Types: Simulink.ImageType

Parameters

Rows — Number of rows in image data

'480' (default) | positive integer

Specify the number of rows in the image data as a positive integer.

Programmatic Use

Block Parameter: Rows

Type: double

Value: positive integer

Default: '480'

Columns — Number of columns in image data

'640' (default) | positive integer

Specify the number of columns in the image data as a positive integer.

Programmatic Use

Block Parameter: Columns

Type: double

Value: positive integer

Default: '640'

Channels — Number of color channels or samples for each pixel in the array

3 (default) | 1

Specify the number of color channels or samples for each pixel in the array as 1 or 3. The number of channels must correspond to the number of color channels in the color format of the image data. These are the values of Channels for the supported color formats:

Channels	Color Format
1	Grayscale
3	RGB
3	BGR

Programmatic Use

Block Parameter: Columns

Type: character vector

Value: positive integer

Default: '3'

Underlying Datatype — Data type of underlying image data

'uint8' (default) | 'int8' | 'uint16' | 'int16' | 'uint32' | 'int32' | 'single' | 'double' | 'logical'

Specify the data type of the underlying image data as one of these options:

• 'uint8'

• 'int8'

• 'uint16'

• 'int16'

• 'uint32'

• 'int32'

• 'single'

• 'double'

• 'logical'

Programmatic Use

Block Parameter: ClassUnderlying

Type: character vector

Value: 'uint8' | 'int8' | 'uint16' | 'int16' | 'uint32' | 'int32' | 'single' | 'double' | 'logical'

Default: 'uint8'

Array Layout — Memory arrangement of matrix data in image

'Column-major' (default) | 'Row-major'

Specify the memory arrangement of the matrix data in the image as Column-major or Row-major.

Programmatic Use

Block Parameter: Layout

Type: character vector

Value: 'Column-major' | 'Row-major'

Default: 'Column-major'

Color Format — Color format of pixels in underlying image data

'RGB' (default) | 'Grayscale' | 'BGR'

Specify what each color channel of a pixel represents in the underlying image data as Grayscale, RGB, or BGR.

Programmatic Use

Block Parameter: ColorFormat

Type: character vector

Value: 'Grayscale' | 'RGB' | 'BGR'

Default: 'RGB'

Block Characteristics

Data Types	double | single | uint8 | uint16 | int8 | int16 | int32 | image
Direct Feedthrough	Yes
Multidimensional Signals	Yes
Variable-Size Signals	No

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

Supports C++ code generation.

Version History

Introduced in R2021b