Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1986-01-17
1988-02-16
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 43, H04N 909, H04N 904
Patent
active
047258810
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is based on a process for increasing the resolution of color television cameras of the type which includes three semiconductor-image sensors, each sensor including an array of optoelectric sensing elements spaced apart one from the other in horizontal and vertical directions by an equal distance, means for scanning line-by-line said sensing elements in the respective sensors to produce output signals corresponding to three different colors, the position of a first sensor being offset in the horizontal direction by one third of the equal distance relative to a second sensor and by two third of the equal distance relative to a third sensor, the scanning means including means for generating three scanning signals applied to the respective sensors, a scanning signal for the second sensor being phase shifted by 120.degree. and a scanning signal for the third sensor by 240.degree. relative to a scanning signal for the first sensor, means for matrixing the output signals from the respective sensors to generate a standard luminance signal and standard color-difference signals, and means for low-pass filtering the standard signals.
In contrast to video camera tubes, the semiconductor image sensors represent a scanning system wherein the illuminated optical information is scanned in two dimensions by discrete image spots. The resolution of the generated video signal is therefore calculated in accordance with the scanning theorem, namely directly by the number of image spots to be realized on the image sensor.
Therefore, an increase in the resolution is only possible by a technically very problematic increase of the number in image spots of the semiconductor-image sensor.
However, after an accurate testing of the signal frequency spectrum at the output of a semiconductor-image sensor possibilities are available to increase the resolution by a suitable signal processing without technological measures. The frequency spectrum is the one of a pulse amplitude modulated signal which consists of a component in the base band as well as components which are grouped by a multiple of a carrier frequency. The actual limiting of the resolution in accordance with the scanning theorem results from the fact that the carrier frequency signal components generate signal components in the base band which falsify the base band signal. However, if it is possible to eliminate the carrier frequency components a higher resolution is made possible, even with a limited amount of image spots.
A solid state television camera with a plurality of semiconductor-image sensors is already known from West German Offenlegungsschrift 28 46 869, wherein the resolution of the television camera can be also improved by means of a suitable geometric disposition of the semiconductor-image sensors and corresponding signal processing. However, the proposed signal processing serves, primarily for shifting the phase of the output signals of the image sensors in accordance with their horizontal offsetting with respect to each other and this circuit is very expensive.
It is therefore an object of the invention to provide a process for increasing the resolution of television cameras with semiconductor-image sensors, wherein the signal processing can be made simpler and performed more effectively.
ADVANTAGES OF THE INVENTION
The process in accordance with the invention includes the steps of the uniformly weighting and adding said output signals from the respective sensors to generate an additional luminance signal; high-pass filtering said additional luminance signal, adding the high-pass filtered additional luminance signal to said standard luminance signal to produce a resultant luminance signal; and deriving from said high-pass filtered luminance signal a control signal for said standard color-difference signals. The process is advantageous in that it is not only less expensive but any interfering components which still may be present can be practically completely eliminated.
Particularly advantageous is the use of a synchronous d
REFERENCES:
patent: 4220977 (1980-09-01), Yamanaka
patent: 4249203 (1981-02-01), Yamanaka
patent: 4507677 (1985-03-01), Reimers
Groody James J.
Robert & Bosch GmbH
Striker Michael J.
Svihla Randall S.
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