Compensation of partly photographed page-images using 3-D shape information

We propose a method in order to compensate contortion of page-image which is caused by photographing a book opened and placed face-up (two pages opposite each other state) on the stage just above. For compensating contortion 3-D shape information of the page surface is necessary to apply some geometrical adjustment. To obtain much higher resolution image a page needs to be photographed partly, in this situation each neighboring image necessarily has overlap area for the purpose of joining together. We put characters existing in an overlap area to good use for seeking of corresponding points in the stereo method by which 3-D shape information (3-D coordinate of corresponding points) of book surface can be obtained. If the assumption that no change of the shape of page cross section along the binding are satisfied, satisfactory compensated images were obtained and joining them together was well performed