Image registration alignment

After consideration of all factors which limit resolution such as exposure hardware, resist systems, registration, alignment, and linewidth control, there is a general consensus that the useful resolution limit of photolithography may lie somewhere between 0.4 and 0.8 /im and depends on such factors as the implementation of short wavelength UV and the ability to accurately place images from a projection tool onto a silicon wafer. 

Imaging Biological Samples Problems and Solutions A. Image Registration The Ideal and the Real 13. Alignment Algorithms C. Spherical Aberration... 

Fig. 15.6. Computerized registration and overlay of DWI lesions on PI images, to determine the exact location of the diffusion lesion with respect to the perfusion deficit. The alignment of the time-to-peak (TTP) and DWI images demonstrates that the lesions are indeed located in the borderzone area where the extent of the perfusion deficit is most pronounced...

Your first step on press is to align the screens in the printheads. However, because both the CD and image are round, you must consider not only X and Y registration, but also the rotational alignment of your screens. 

Registration basis. Refers to the image features that will be used to establish the alignment. These can be extrinsic registration objects, such as a stereotactic frame or fiducial markers, or intrinsic, such as anatomical landmarks, anatomical contours, or pixel intensity values. 

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