Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-01-19
1986-12-23
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 40, 358 41, 358 43, 358 44, H04N 967, H04N 964, H04N 904, H04N 907
Patent
active
046315756
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a charge transfer device for processing color signals suitable for being applied to a color signal processing circuit in an image sensor which employs as its image sensing element a charge transfer element such as a CCD or the like.
DESCRIPTION OF THE PRIOR ART
When a matrix-type color filter F as shown in FIG. 1 is used to project an object onto a CCD used as an image sensing element to thereby produce predetermined color separated images from which respective dot sequential signals of primary color signals G, R and B are formed, and wherein desired color difference signals are formed from these dot sequential signals, a color signal processing circuit shown in FIG. 2 is generally used.
In FIG. 2, reference numeral 1 designates an object and 2 a CCD in which the dot sequential signals G and R are derived from n lines (odd line) and the dot sequential signals B and G are derived from n+1 lines (even line).
While these dot sequential signals are delivered as signal charges, these signals are converted to the voltages by an output circuit 3 provided at the rear stage thereof. The dot sequential signals converted to the voltage levels are supplied to a signal separating circuit 4. To the signal separating circuit 4 is supplied a switching pulse P.sub.S, the period of which is equal to the pitch of the picture elements aligned in the horizontal direction and thereby the separation of the signals is carried out. From one output line thereof is separated and derived the primary color signal G, while from the other output line is separated and then derived the line sequential signal of R and B.
The line sequential signal of R and B is supplied to a simultaneous circuit 10 in which the primary color signals R and B are made simultaneous. For this purpose, the line sequential signal is supplied to a delay element 11 of CCD construction thereby delayed by one horizontal period. The delayed output (as a signal charge) therefrom is supplied again to an output circuit 12 and thereby converted to the voltage level. The delayed output which is converted to the voltage level is supplied to a switching circuit 13 together with the non-delayed output. Then, when the switching circuit 13 is alternately controlled in switching operation at one horizontal period, the primary color signals of R and B which are made simultaneous are formed.
The simultaneous primary color signals of R and B are supplied to a color difference signal generating circuit 15 together with the primary color signal G. And, as a result of logical calculation thereof, from a terminal 16 is derived a color difference signal (G-R), while from a terminal 17 is derived a color difference signal (G-B), respectively.
With such a color signal processing circuit, when the delay element 11 of the CCD construction shown in the figure is employed so as to make the line sequential signals of R and B simultaneous, the output circuit 12 must always be provided. However, since this output circuit 12 generally has a temperature characteristic, the delayed output and the non-delayed output become different from each other in level. Therefore, a level adjusting circuit is required for correcting the ordinary level error. In FIG. 2, reference numeral 14 designates a circuit for level adjusting as mentioned above.
As described above, the conventional color signal processing circuit requires the output circuit 12 and the level adjusting circuit 14. In addition, these circuits and the color difference signal generating circuit 15 can not be formed within the chip used to construct the delay element 11, but are connected thereto from the outside, making the circuit construction complicated and increasing the number of the assembly parts thereof. Of course, it is troublesome when adjustments of the level adjusting circuit 14 are manually required.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a charge transfer device for processing color signals which does not require an output circuit
REFERENCES:
patent: 4337403 (1982-06-01), Berger et al.
patent: 4387389 (1983-06-01), Tanigawa
Sequin, Carlo H., et al., Charge Transfer Devices, Academic Press, Inc., New York et al., 1975, pp. 48-50.
Groody James J.
Sony Corporation
Svihla Randall S.
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