drawCameraView(img,frust3DPoints): draw a camera frustum and an image into it
Inputs:
* img is the image we want to view
* frust3DPoints are the 3D coordinates of the image plane in the frustum

Run as:
img=imread('image.jpg');
[H,W,~] = size(img);
% Need to know the camera focal length, pan, tilt and roll, optionally can use
% [tilt,roll]=computeTiltAndRoll(imname,flen);
T = findTransformMatrix(W,H,flen,pan,tilt,roll);
frust3DPoints = findFrust3DPoints(W,H,T);
h = drawCameraView(img,frust3DPoints);
% To put the view in a cardinal coordinate system, run:
cardinalCoordSys();