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How to plot plot Intensity vs pixel values using simulink xy graph?

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Iftak Hussain
Iftak Hussain el 23 de Mzo. de 2020
Comentada: Iftak Hussain el 24 de Mzo. de 2020
I am using Simulink support package for Android to design an application. I need to get the grayscale intensity values from the live camera and plot it against the pixel count. I have used a MATLAB function to get grayscale intensity with R,G,B matrix from the camera. I need to plot the column vector grayIntensity (size: 1x720 due to the camera resolution) against the vector pixel_count. Is there any way to use the XY graph block to do this?
function [r_out, g_out, b_out,grayIntensity, pixel_count] = Grayscale(r_in,g_in, b_in)
%%Get RGB Color
r = r_in;
g = g_in;
b = b_in;
gray= (r+g+b)/3;
G = sum(gray)*0.004;
grayIntensity = G';
%% RGB output
r_out = uint8(r);
g_out = uint8(g);
b_out = uint8(b);

Respuestas (1)

Sutanu Maiti
Sutanu Maiti el 24 de Mzo. de 2020
XY graph is not there for Android Deplpooyment.
But you can use Arrayplot block on Android device.
Please have a look at below example that plots signal on android screen:
  1 comentario
Iftak Hussain
Iftak Hussain el 24 de Mzo. de 2020
Hi Sutanu,
I have tried using array plot but the problem is it is not plotting all the values in the x-axis. The camera resolution is 1920x1080 but when I tried to plot the grayIntensity vs pixel_count then it is showing some random values. Please find attached the screenshots. I have also tried to setup the axes correctly in the array plot. Checked both with custom [] and sample increment. Still getting the error, the x-axis should show the values from 0:1080 but it is very different. I don't know why it is missing values in both the sides.

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