I try photomatching archive images (dated 1890 or so) of rather large rooms (workshop) in a building. Of course, no idea what was the focal length and/or the parameters of the camera(s) used to take them back then and whether they have been cropped. The nice thing is that I have an architectural drawing of the building with accurate dimensions. I therefore built a 3D model of the rooms and try to match it with the available photos. I encounter several problems (usually that no matter how I carefully orient the model wrt photos with Photo Match), I always end up with scaling errors in at least one dimension.
Could it be related to the last post on the subject? As mentioned in the excerpt of SU Help cited in the last post, no cropping is allowed for Photo Match to work reliably. If my understanding of the last post is correct, the original image should be (vertically?) "un-cropped" so that the horizon passes through the vertical center of the (resulting un-cropped) photo. Is this a rule of thumb? And what about lateral un-cropping? Are the assumptions under which SU Photo Match works correctly described somewhere?
