Image From File
Read image from file location
![](img_file.png)
Libraries:
Computer Vision Toolbox /
Sources
Description
The Image From File block reads an image from a specified file location and imports it to the Simulink® workspace. The input file can contain a binary image, grayscale image, or color image.
Examples
Ports
Output
Image — Output image
matrix | 3-D array
Output image, returned as a matrix or 3-D array. If the image read is a binary or grayscale image, the output is an M-by-N matrix. If the image read is a color image, the output is an M-by-N-by-3 array.
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 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
File name — Input image
peppers.png
(default) | file name
Specify the name of the file that contains the image to read. If the file is not on
the MATLAB® path, click Browse and navigate to the file. For
the list of supported file formats, see the imread
function reference page in the MATLAB documentation.
Note
The File name parameter supports URL paths.
Sample time — Sample time for block execution
inf
(default) | Positive scalar
| Vector
Specify 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. For an input grayscale or color image, the output is a 3-D or 4-D array, respectively.
The value of the added dimension is equal to floor((Tsim/Ts)+1).
Tsim is the simulation time and Ts 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 file.
One multidimensional signal
— The block has one output port, which returns the entire image.Separate color signals
— The block has three output ports, one for each color channel, which returns the individual color channels of the image.
Output port labels — Output port labels
R|G|B
(default) | port names
Specify the labels for the output ports. Each label can be any value. Use vertical bar character, |, as a delimiter between the names of 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 output image
inherit from input image (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 input image data type,differs from the selected 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 both. Double- and single-precision floating-point pixel values must be in the range [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 fixed-point data type
User-defined
(default) | Best precision
Specify the scaling factor of the fixed-point output as one of these options.
Best precision
— The output scales automatically such that the output signal has the best possible precision.Choose
User-defined
— Specify 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 port ,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
uint(8)
(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 |
|
Multidimensional Signals |
|
Variable-Size Signals |
|
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
Version History
Introduced before R2006a
See Also
Blocks
- From Multimedia File | Image From Workspace | To Video Display | Video From Workspace | Video Viewer
Functions
MATLAB 命令
您点击的链接对应于以下 MATLAB 命令:
请在 MATLAB 命令行窗口中直接输入以执行命令。Web 浏览器不支持 MATLAB 命令。
Select a Web Site
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
How to Get Best Site Performance
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Americas
- América Latina (Español)
- Canada (English)
- United States (English)
Europe
- Belgium (English)
- Denmark (English)
- Deutschland (Deutsch)
- España (Español)
- Finland (English)
- France (Français)
- Ireland (English)
- Italia (Italiano)
- Luxembourg (English)
- Netherlands (English)
- Norway (English)
- Österreich (Deutsch)
- Portugal (English)
- Sweden (English)
- Switzerland
- United Kingdom (English)