How to insert transparent background image behind several line plot?

I got several lines plot as shown above, and I would like to insert the image with transparent backgroud then set its transparency behind the plot. How I can do that? The expected result is attatched below.

This is my current code for that

 
img = imread('P.png');
min_x = 0;
max_x = 0.8;
min_y = 0;
max_y = 3.5;
imagesc([min_x max_x], [min_y max_y], flipud(img));
set(gca,'ydir','normal');

But what I got from this code is pretty weird!

Answer 1

[Sulaymon Eshkabilov]

First, your display your image and then plot on top of that image, e.g.

x = imread('MYimage.jpg');
imshow(x),colormap jet
hold on
a = 1:25; b=a*2-3;
c= linspace(1, 5); d = sqrt(c+15);
plot(a,b,'r-o',c,d,'k--d')

good luck