Image From Workspace

Import image from MATLAB workspace

• 

Libraries:
Computer Vision Toolbox / Sources

Description

The Image From Workspace block imports an image from a matrix, 3-D array, MATLAB function, or variable stored in the MATLAB^® workspace, to the Simulink^® workspace.

Examples

Import Image From MATLAB Workspace

Import an image from MATLAB to Simulink workspace using Image From Workspace block.

• Open Script

Ports

Output

Image — Output image

matrix | 3-D array

Output image, returned as a matrix or 3-D array. If the imported image is binary or grayscale image, the output is a matrix of size M-by-N. If the imported image is a color image, the output is a 3-D array of size M-by-N-by-3.

Dependencies

To enable this port ,set the Image signal parameter to One multidimensional signal.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point

R — Red color component of image

matrix

Red color component of the image, returned as an M-by-N matrix. The block returns this output if the input is a color image. If the Image signal parameter is set to Separate color signals and the input image is binary or grayscale, the block returns only this port

Dependencies

To enable this port, set the Image signal parameter to Separate color signals.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point

G — Green color component of image

matrix

Green color component of the image, returned as an M-by-N matrix. The block returns this output only if the input is a color image.

Dependencies

To enable this port, set the Image signal parameter to Separate color signals.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point

B — Blue color component of image

matrix

Blue color component of the image, returned as an M-by-N matrix. The block returns this output only if the input is a color image.

Dependencies

To enable this port ,set the Image signal parameter to Separate color signals.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point

Parameters

Main

Value — Image to be imported

rand(100,100,3) (default) | vector | matrix | 3-D array | MATLAB workspace variable | MATLAB function

Specify the image as a vector, matrix, 3-D array, function, or MATLAB workspace variable. The value parameter can be:

• Vector — The value given to the Value parameter can be a row vector or column vector

• 3-D numeric array — The value given to the Value parameter can be 3-D array, which is generated using MATLAB functions

• MATLAB workspace variable — The value given to the Value parameter can be a variable name, which is MATLAB workspace variable

• MATLAB function — The value given to the Value parameter can be a MATLAB function with specified input arguments to generate a numeric array

Sample time — Sample time for block execution

inf (default) | positive scalar | Vector

This parameter specifies the sample time for block execution. Vector length must be 2 which represents [Period, Offset] values where offset should be less than period and non-negative. Given the default value of inf, the block outputs a matrix for grayscale and binary. The output is 3-D or 4-D, if the input image is a gray scale or color image respectively.

The value of the added dimension is equal to floor((T_sim/T_s)+1)

T_sim is the simulation time and T_s is the sample time, for block execution. For example, if the input image is a 256-by-256 matrix, the simulation time is 10 sec and the sample time is set to 0.5 sec, then the output is a 256-by-256-by-21 array.

Image signal — Signal returned by block

One multidimensional signal (default) | Separate color signals

Specify how the block returns the image read from the MATLAB workspace.

• One multidimensional signal— The block has one output port, Image, that returns the entire image.

• Separate color signals — The block has an output port for each color channel. Each port returns a single color channel of the image.

Output port labels — Output port labels

R|G|B (default) | port names

Specify labels for the output ports. Each label can be any value. Use the vertical bar character, |, as a delimiter to name all the output ports.

Dependencies

To enable this parameter, set the Image signal parameter to Separate color signals.

Data type

Output data type — Data type of the output image

Inherit from Value (default) | double | single | int8 | uint8 | int16 | uint16 | int32 | uint32 | boolean | Fixed-point | User-defined | Inherit via back propagation | ...

Specify the data type of the output image. If the data type of the imported image, specified in the Value parameter, differs from the value of the Output data type parameter, the block scales the pixel values, adds an offset to the pixel values so that they are in the dynamic range of the new data type, or does both. Double- and single-precision floating-point pixel values must be in the range of [0, 1].

Signed — Signed fixed-point data type

on (default) | off

Select this parameter if the input image data type is signed fixed-point.

Dependencies

To enable this parameter, set the Output data type parameter to Fixed-point.

Word length — Bits in fixed-point data type

16 (default) | positive scalar

Specify the word length, in bits, of the fixed-point output data type. The value should be less than 32.

Dependencies

To enable this parameter, set the Output data type parameter to Fixed-point.

Set fraction length in output to — Scaling factor of the fixed-point

User-defined (default) | Best precision

Specify the scaling factor of the fixed-point output by either of the following two methods:

• Best precision— The output scaling automatically such that the output signal has the best possible precision.

• User-defined — The output scaling in the Fraction length parameter.

Dependencies

To enable this parameter, set the Output data type parameter to Fixed-point.

Fractional length — Fractional bits

15 (default) | scalar

Specify the number of bits to the right of the decimal point.

Dependencies

To enable this parameter, set the Output data type parameter to Fixed-point, and set the Set fraction length in output parameter to User-defined.

User-defined data type — User-defined fixed-point data type

sfix(16) (default) | user-defined fixed-point data type

Specify any built-in or fixed-point data type. You can specify fixed-point data types using the fixdt (Simulink) function.

Dependencies

To enable this parameter, set the Output data type parameter to User-defined.

Block Characteristics

Data Types	Boolean | double | fixed point | integer | single
Multidimensional Signals	no
Variable-Size Signals	no

Extended Capabilities

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

Version History

Introduced before R2006a

R2022b: Image From Workspace block default value changes

This release changes the default value for the Image From Workspace block to rand(100,100,3). Previously, the default value was checker_board.