Abstract: A system and method provides the necessary image information to enable tonal correction for independent regions of a compound document. A scanner scans an image and generates image data. A histogram circuit, connected to the scanner, generates histogram data from the image data for a predetermined number of regions corresponding to the image. A windowing circuit, operatively connected to the scanner and in parallel with the histogram circuit, generates a window corresponding to an independent area of the image that requires image enhancement and an association circuit associates corresponding histogram data with the generated window. The associated histogram data and window are used by an image enhancement process to modify the image data to provide a more desirable reproduction of the scanned image.

Abstract: An image processing arrangement for allowing a number of image processing techniques to be tested on a single sample sheet at a single time. A sample segment of the image may be selected for testing and successively repeated in a sample output for the number of image processing techniques to be tested. The proof page is printed on the printer, with the output of the proof page demonstrating the system operation with the desired image processing technique.

Abstract: A capacitive paper property sensor for sensing the moisture content of copy sheets in a xerographic system in which a copy sheet feed roll pair are made overlong to provide a non-feeding nip segment in addition to the feeding nip segment; a capacitor in each non-feeding and feeding nip segment with the capacitor plates thereof in substantially the same plane as the roll surface, each capacitor providing capacitance signals reflecting the current size of the roll nip in both the non-feeding and feeding nip segments; comparator means for comparing the capacitance signal output of one capacitor with the capacitance signal output of the other capacitor to provide a signal representative of the moisture content of the copy sheet passing through the roll nip; a memory for storing various moisture content/control signal relationships to thereby enable the moisture signal to be converted to a control signal; and control means for adjusting at least one of the xerographic system operating components in response to the