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Telecommunications system for transmitting images
| Details |
Inventors: Pornbacher, Fritz;
Assignee: Siemens Aktiengesellschaft (Munich, DE)
Primary Examiner: Grant, II; Jerome
Assistant Examiner:
Attorney, Agent or Firm: Schiff Hardin & Waite
On the transmission side, an image, for example a black-and-white individual image, is picked up and stored on request by a simple camera, for example with a wide-angle lens and optical viewfinder. The image data of the image message are suitably compressed and subsequently coded with a telecommunications-channel-specific code and transmitted, preferably unidirectionally, indirectly or directly to a telecommunications network (for example a wired or wireless telephone network). On the reception side, the image data are accepted--in a way corresponding to the process on the transmission side--either directly or indirectly. After decompression and decoding, the image data are stored in a screen store and transmitted to the screen, for example an LCD flat screen, according to the instructions of a screen controller. Both the transmission device and the reception device can thus be designed to be compact--for the purpose of fast image transmission combined with a simple switching and programming structure--, mobile and independent of telecommunications channels. |
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DETAILED DESCRIPTION The object on which the invention is based consists in setting up a telecommunications system for transmitting images, in particular black-and-white individual images, which makes possible transmission which is much simpler and can be used universally.
In general terms the present invention is a mobile transmission device for transmitting images having: first means for optically capturing a transmission image motif and producing an image message from the transmission image motif; second means for processing appropriately for transmission the image message produced; third means for transmitting the image message, which can be connected via a telecommunications channel to a reception device for receiving the image message; and fourth means for controlling the functional sequences in the transmission device, in particular the first to third means.
The first to fourth means are designed and connected in such a way that, when a telecommunications connection is set up between the transmission device and the reception device by the transmission of voice or control data initiating the image transmission, the image message is transmitted on the telecommunications channel time-shifted with respect to the transmitted voice or control data and independently of the type of telecommunications channel.
Advantageous developments of the present invention are as follows.
The third means are connected directly to the telecommunications channel.
The third means are connected via an acoustic coupling with a telephone set to the telecommunications channel.
The first to fourth means are contained in a mobile part of a wireless telephone.
The first means and fourth means are designed in such a way that the image information contained in the image message is composed of 100 Pt 100 image pixels having 16 shades of gray which can be represented by 4 bits per image pixel.
The first to fourth means are designed in such a way that, of the data bits defining the image pixels of the image information, initially only the most-significant bit is transmitted and, in the image build-phases which follow, the respectively next-most-significant bit is transmitted
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