Facsimile and static presentation processing – Facsimile – Picture signal generator
Patent
1996-02-02
1998-03-10
Vu, Kim
Facsimile and static presentation processing
Facsimile
Picture signal generator
358300, 358306, 358412, 358409, 358410, H04N 104, H04N 123, H04N 136
Patent
active
057267766
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a method for the synchronization of image recordings of monochrome recordings and color recordings with light-sensitive sensors according to the preamble of patent claim 1 as well as to an arrangement associated therewith.
STATE OF THE ART
A digital scanning of the picture patterns, moving relative to the image-recording camera, is realized technically in general with charge-coupled device (CCD) line cameras. Incremental transmitters are employed for the synchronization in particular in case of rotating picture patterns, where the pulses of the incremental transmitter are employed directly for the exposure control of the lighting equipment. Furthermore, the control signals are generated from these pulses for the image storage for storing the scanned digital image values.
This method suffices for the applications with a nearly constant transport speed and in cases, where only modest requirements are imposed on the recording quality. In case of precision applications with a variable transport speed, the present rigid coupling between the pulses of the incremental transmitter and the integration cycle of the charge-coupled device (CCD) line camera results in measurement errors. These measurement errors are then expressed in a speed-dependent phase shift in transport direction between the reference grid of a line-scanning pattern on the line-scanning pattern and the actually measured actual grid of the line-scanning pattern. Furthermore, the dividing or splitting errors, mechanical vibrations, and phase noise of the incremental transmitter, as well as further errors affect directly the image recording. A line-scanning pattern is required which is freely programmable in its parameters offset and line distance for a series of applications, wherein the freely programmable line-scanning pattern cannot be realized with the known rigid coupling between the pulses of the incremental transmitter and the line addresses.
In this context, the image recording is realized with one charge-coupled device (CCD) line camera or with several charge-coupled device (CCD) line cameras, wherein the several charge-coupled device (CCD) line cameras are combined to form a longer line. In particular, in connection with precision measurements with several color cameras, the absolute color measurement error frequently does not meet the requirements.
An image-scanning apparatus and reading apparatus has become known from the European Patent Application EP-A-0,301,506, wherein the image-scanning and reading apparatus comprises a transparent drum, supporting a plurality of originals, and calibration reference regions, which calibration reference regions serve as references during reading of the originals. A scanning head scans the rotating drum. A computer unit includes a memory storage for storing the calibration reference regions of the drum. The position of the calibration reference regions is stored at a time prior to the reading of the originals. If the scanning process is started, then the scanning head is moved to the stored position of a first calibration reference region, the calibration is performed, and the original belonging thereto is read in that the calibration data is stored. The scanning process of each successively following original is similar to the preceding one by recalibrating by means of the corresponding reference region, wherein each calibration process occurs during the rotation of the drum.
A time transmitter synchronization system with time pixels for correcting phase jitters for an optical scanning device has become known from the U.S. Pat. No. 4,635,000, which time transmitter synchronization system exhibits a continuously running pixel time source, electronic switching circuits for generating of automatic error control signals with amplitudes, which represent each phase error between the start of the scanning and the start of the pixel count pulses and each phase error between the end of the scanning and the end of the pixel count pulses, as well as electronic switc
REFERENCES:
patent: 4453170 (1984-06-01), Arao
patent: 4801978 (1989-01-01), Lama et al.
patent: 4862512 (1989-08-01), Hidaka et al.
Auer Michael
Grossmann Hans-Peter
Ihlefeld Joachim
Pester Michael
Uhlig Gunther
F & O Electronic System GmbH
Harris Tia M.
Kasper Horst M.
Vu Kim
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