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...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 4389677 | Method and apparatus for removing erroneous elements from digital images A method and apparatus for removing erroneous data elements from digital images by systemically moving a window memory over the entire area of an image. Each data element in the image is examined with respect to neighboring elements by comparing the conte... | 06/21/1983 |
| 4298895 | Visual image noise eliminating system Method and apparatus for eliminating noise in a digitally recorded visual image wherein the proportion of picture elements in an area surrounding an objective area having a first visual level or component is determined and the objective area concluded as ... | 11/03/1981 |
| 4188643 | Method and arrangement for correcting errors in facsimile transmission In facsimile transmission the sequences of picture elements having the same luminance are transmitted in coded form. The code words have, in general, different lengths and no ambiguous beginning or end marking respectively. Consequently, in case of a dist... | 02/12/1980 |
| 4163605 | Method of picture reproduction with variable reproduction scale A method of picture reproduction with variable reproduction scale. The original picture is scanned to obtain picture signals to be recorded, the picture signals are written into a memory with addressing in synchronization with timing pulses, and then the ... | 08/07/1979 |
| 4150402 | Method and apparatus for reducing the effect of laser noise in a scanning laser read system The output beam from a laser scans an input document and the signal reflected therefrom, corresponding to information on the document, is detected and amplified in a first amplifier and converted to an electrical signal. The laser beam is also sampled pri... | 04/17/1979 |
| 4145721 | Photosensitive self scan array with noise reduction A noise reduction scheme for a photosensitive self scan system includes an array of photosensitive elements producing video signals and first and second pluralities of switching elements, one element of each of the pluralities of switching elements being ... | 03/20/1979 |
| 4129853 | Method and apparatus for producing compensated signals for individual light sensors arranged in a predetermined relation The output signal from each light sensor of a solid state array is compensated for variations due to dark scan noise levels, which are due to fixed pattern noise and sensor leakage, produced by the individual light sensors and variations in the light cond... | 12/12/1978 |
| 4128830 | Apparatus for providing a compensation signal for individual light sensors arranged in a predetermined relation The dark scan noise level produced from each of a solid state array of light sensors is obtained by preventing light from being received by each of the light sensors for a predetermined period of time. This signal is converted into a digital signal and st... | 12/05/1978 |
| 4072818 | System for converting tonal images to line drawings A device for substantially instantaneously converting a tonal image, such as a photograph, to a line drawing which depicts the lines formed by the borders of contrasting portions of the tonal image. The tonal image is scanned by a video scanner to produce... | 02/07/1978 |
