MATLAB TUTORIAL NINE

Image Processing using SIMULINK

Introduction:

Simulink is very much user friendly if you are convergent with image processing operations.

  Type simulink command on the command prompt

  Click on Computer Vision System toolbox

  There are various options available in this tool box, go through all the

  options one by one.

We will use following blocks in this experiment ….

[1] Computer Vision System Toolbox > Sources>Image from file

[2] Computer Vision System Toolbox > Sinks>Video Viewer

[3] Simulink > Math Operations > Matrix Concatenate

[4] Computer Vision System Toolbox > Statistics>Histogram

[5] DSP System Toolbox > Signal Processing Sinks > Vector Scope

Select Image file by clicking on image block. Set following parameters in image block :

  Sample time = inf 

  Image signal = Separate color signals

  Output port labels: = R|G|B

  Output data type: = double

Set following parameters in histogram block:

  Lower limit of histogram: 0

  Upper limit of histogram: 1

  Number of bins: = 256

Set following parameters in matrix concatenate block:

  Number of input parameters: 3

Set following parameters in Vector scope

  Scope Properties pane, Input domain = User-defined

  Display Properties pane, clear the Frame number check box

  Display Properties pane, select the Channel legend check box

  Display Properties pane, select the Compact display check box

  Axis Properties pane, clear the Inherit sample increment from input check box.

  Axis Properties pane, Minimum Y-limit = 0

  Axis Properties pane, Maximum Y-limit = 1

  Axis Properties pane, Y-axis label = Count

  Line Properties pane, Line markers = .|s|d

  Line Properties pane, Line colors = [1 0 0]|[0 1 0]|[0 0 1]

Open the Configuration dialog box by selecting Configuration Parameters from the Simulation menu. 

Set the parameters as follows:

  Solver pane, Stop time = 0

  Solver pane, Type = Fixed-step

  Solver pane, Solver = Discrete (no continuous states)

Run simulation and see result on vector scope. Change file and do experiment again.