Use interp2 to transform a binary matrix with polar values to cartesian values

Hi,

I have a Matrix with binary values, which shows an edge of a bscan

I want to transform this binary matrix into Cartesian values. I already have a skript which can transform polar images into cartesian but using it on binary values gets the following Error:

Error using griddedInterpolant

Sample values must be of type double or single.

My Code to transform the Matrix is the following:

function [bscanCart] = image2Cart(bscan)
    % Determine size
    [height,length] = size(bscan);
    theta = linspace(-pi,pi,length);
    rho = 1:1:height;
    [THETA,RHO] = meshgrid(theta,rho);

    % Determine grid for interpolation
    [XCart,YCart] = meshgrid(linspace(-512, 512, 512*2), linspace(-512, 512, 512*2));
    [XPol,YPol] = cart2pol(XCart,YCart);

    % interpolating
    bscanCart = interp2(THETA,RHO,bscan,XPol,YPol);
end

This is how the bscan looks like after the transformation

Answer 1

[KALYAN ACHARJYA]

bscan=rgb2gray(imread('image.png'));
result=image2Cart(double(bscan));
imshow(result);
function [bscanCart] = image2Cart(bscan)
% Determine size
[height,length] = size(bscan);
theta = linspace(-pi,pi,length);
rho = 1:1:height;
[THETA,RHO] = meshgrid(theta,rho);
% Determine grid for interpolation
[XCart,YCart] = meshgrid(linspace(-512, 512, 512*2), linspace(-512, 512, 512*2));
[XPol,YPol] = cart2pol(XCart,YCart);
% interpolating
bscanCart = interp2(THETA,RHO,bscan,XPol,YPol);
end

[Kjell]

thank you