You will be given couple of raw images coming from the camera. In these images you have to evaluate the distance between the camera and the objects. You may select the objects manually on the image by any chosen method you prefer, you do not need to actually detect the objects.
We collected different facts, that might be relevant for you:
You can use the pinhole camera model
The ground is totally flat and horizontal.
The intrinsic camera calibration parameters of the camera are:
focal length (in pixels): FocalLengthX, FocalLengthY
principal point offset (in pixels): PrinciplePointX, PrinciplePointY
axis skew: Skew
The extrinsic camera calibration parameters of the camera are:
Yaw (Z), Pitch (Y), Roll (X) (in radian): Yaw, Pitch, Roll
Height (Z) (in meters): Height
The extrinsic camera rotation parameters and camera height are given in the World coordinate system as seen in the images.
The ground is flat and horizontal
The average widths of different vehicles are the following:
van / small truck: 2.0m
bus / full-sized truck: 2.4m
You can find these images here in .pgm format, along with the parameters of the camera in the following table.