Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-01-16
1991-11-26
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358142, 358105, H04N 712, H04N 700
Patent
active
050687271
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Background of the Invention
In known high definition television image transmission systems utilizing a MAC (multiple analog component) standard, transmission is provided by means of an analog channel which carries the data which have been compressed. This analog channel is associated with an auxiliary channel called the digital assistance channel enabling the transmission of additional data relating to the motion of the images transmitted by the analog channel.
One problem which arises is maintaining a satisfactory spatial definition despite the motion in the images to be transmitted and despite the data compression necessary for adapting the quantity of these data to the limited passband of the transmission channel.
The object of the invention is therefore to provide, for a high definition television image transmission system, a decoding device effectively resulting in the best possible spatial resolution no matter what the speed of displacement of the content of the transmitted images may be.
SUMMARY OF THE INVENTION
The invention relates to a device characterized in that it comprises three processing branches located in parallel and each receiving the sequence of the said encoded data transmitted by a first channel and a circuit for routing the outputs of the said branches according to the output signal of a decision circuit transmitted to the decoding device by means of a second channel called the digital assistance channel. The branches in particular comprise, in series, a dynamic interpolation circuit and a spatial filtering circuit, in that one branch also comprises, in series, a circuit for reconstructing images from, on the one hand, the transmitted encoded data and, on the other hand, from data representative of the motion of the original images which is substituted for these images and also transmitted by means of the second channel. The first and third branches also comprise, in series, multiplexers receiving on the one hand the interpolated output data of the corresponding dynamic interpolation circuits, on the other hand the output signal of the decision circuit, and also the output signal of the image reconstruction circuit of the second branch.
The invention also relates to a high definition television image transmission system including such a device.
The invention is in fact essentially applicable in the high definition television field. In a high definition television image transmission system according to the MAC standard, it enables a reduction in the passband of television signals for the purpose of transmitting them.
BRIEF DESCRIPTION OF THE DRAWINGS
The features and advantages of the invention will now appear in a more detailed way in the following description and in the appended drawings, given by way of non-limiting example and in which:
FIGS. 1a and 1b respectively show the encoding section on the transmission side and the decoding section on the reception side of a motion estimation and compensation device for a television image transmission system;
FIGS. 2 and 4 respectively show the encoding section on the transmission side and the decoding section on the reception side of an embodiment of another motion estimation and compensation device for a high definition television image transmission system;
FIG. 3a is a more detailed representation of a motion estimation stage in the device of FIG. 2, FIGS. 3b and 3d explain the content of the estimation circuits of the stage shown in FIG. 3a, and FIG. 3c shows an illustrative embodiment of the stages forming these estimation circuits;
FIGS. 5 and 6 show variant embodiments incorporating the devices of FIGS. 2 and 4 respectively;
FIG. 7 shows an example of an embodiment, in a high definition television image transmission system, of a device for encoding data capable of being received by a decoding device according to the invention;
FIGS. 8a to 8c show the three processing branches in the device of FIG. 7, FIG. 8d shows a variant of the branch shown in FIG. 8c, and FIGS. 9a to 9c show the corresponding image formats
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patent: 4442454 (1984-04-01), Powell
patent: 4745459 (1988-05-01), Ninomiya et al.
patent: 4785348 (1988-11-01), Fonsalas
patent: 4845561 (1989-07-01), Doyle et al.
patent: 4873573 (1989-10-01), Thomas et al.
patent: 4963965 (1990-10-01), Haghiri et al.
patent: 4985767 (1991-01-01), Haghiri et al.
patent: 5027206 (1991-06-01), Vreeswijk et al.
Colloque TVHD '87, Ottawa, 4-8 Oct. 1987, vol. 1, P. Bernard et al.: "Analyse de structures de sous-e'chantillonnage spatio-temporel d'un signal TVHD en vue de sa transmission dans un canal MAC", pp. 6.2.2-6.2.28, voir p. 6.2.8, line 20-p. 6.2.13, line 9, figure 15.
Fonsalas Frederic
Guntzburger Philippe
Haghiri Mohammed R.
Le Queau Marcel
Groody James J.
Marion Michael E.
Metjahic Safet
U. S. Philips Corporation
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