Abstract
An analysis has been made to relate the optical transmittances of halftone images produced by various halftone screens to the transmittances of the continuous tone original. The halftone screens included in this analysis have both one-dimensional and specific two-dimensional cell patterns. It is found that the transmittance of the halftone image can be represented by a combination of the average transmittance of the halftone image and that determined by the thresholding step. These expressions can be used for computing corresponding Fourier spectrum and for predicting spatially filtered output characteristic in a coherent optical image processing system.