• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In the optoelectronic scanning of fine detail or areas of low contrast in an original, small video signal amplitudes occur. Such a signal can only be accentuated if the video signal is continuous. A pulsed signal occurs on scanning the original with a line of photo-diodes and on processing the signal by means of sample and hold circuits. The invention proposes that a low-pass filter 17 be connected at the outlet of the scanning member 4 to convert such pulsed signal into a continuous signal. The low-pass filter may have an amplification frequency characteristic which has an increased amplification in the flank area so that the high frequency parts are amplified and loss of detail is compensated for. <IMAGE>
    公开号:SU1132803A3
    申请号:SU792778052
    申请日:1979-06-18
    公开日:1984-12-30
    发明作者:Зоммер Рюдигер；Вишер Херманн
    申请人:Др.-Инж.Рудольф Хелль Гмбх (Фирма)；
    IPC主号:
    专利说明:

    2. A graphic information reading device comprising a threshold element whose output is an output of the device, a focusing element optically connected to a light source and one input of a photoelectric conversion unit, the other input of which is connected to a clock generator, different from that In order to increase the accuracy of the device, it contains a low-pass filter, the input of which is connected to the output of the photoelectric conversion unit, and the output is connected to the threshold element.
    3. The device according to claim 2, characterized in that the low-pass filter comprises a first resistor connected in series connected to the same input of the first capacitive element. the second resistor connected to the input of the second capacitor (element, the operational amplifier whose output is the filter output and connected through the third resistor to the fourth resistor connected to the zero potential bus and to the second input of the operational amplifier, and the output of the first capacitive element connected to the output of the operating element.
    The invention relates to the field of automation, in particular to devices for reading graphic information, and can be used for reading and transmitting facsimile images.
    A device for reading graphic information containing a focusing element, optically coupled to a light source, a photoelectric conversion unit connected via amplifiers to a logic unit, a control unit and AND, OR 1 elements is known.
    The disadvantage of this device is its constructive complexity.
    Closest to this is a device containing a photoelectric conversion unit, the outputs of which are connected via amplifiers to the first multiplier, the scanning (scanning) unit. the second multiplier and the threshold element connected to logic unit 2.
    The disadvantage of the device is low accuracy ..
    The purpose of the invention is to eliminate this drawback, improving the accuracy of the device.
    . The goal is achieved by the fact that in the device containing the threshold element, the output of which is the output of the device, the focusing element is optically connected
    with a light source and one input of the photoelectric conversion unit, the other input of which is connected to a clock pulse generator, a low-pass filter is input whose input is connected to the output of the photoelectric conversion unit and a pulse shaper whose input is connected to the output of the low-pass filter and the output input threshold element.
    A low-pass filter is inserted into the device, the input of which is connected to the output of the photoelectric conversion unit, and the output is connected to the threshold element;
    The low-pass filter contains a series-connected first resistor connected to one input of the first capacitive element, a second resistor connected to the input of the second capacitive element, an operational amplifier whose output is the output of the filter and connected via a third resistor to the zero resistor connected to the zero bus potential and to the second input of the operational amplifier, and the output of the first capacitive element is connected to the output of the operational element ...
    Figures 1 and 2 illustrate embodiments of the device, FIG. 3 is an example of a constructive embodiment of a low pass filter 3 in FIG. 4 a characteristic of a lower filter is often the first variant of the device (figure 1 contains a photoelectric conversion unit 1, made for example in the form of a plurality located at least in one row of photodetectors, a light source 2, a focusing element 3, a low-pass filter 4, a pulse shaper 5, a threshold element 6, and a modulator 7. Figure 1 also shows the input 8, along which element 6 along steps a horn signal, an input 9, through which block 1 receives such pulses from a generator (not shown), and information carrier 10. The second variant of the device differs from the first in that there is no pulse shaper 5, and a low-pass filter (FIG. 3) is made to exceed the gain (Fig. 4) ... The device works as follows: The copied original of the information carrier 10 is illuminated by the light source 2 and the luminous flux modulated by the original information of the original through the focusing element 3 enters block 1, where photo trap The mnik is converted to an image signal. Block 1, controlled by clock pulses at input 9, generates a pulsed or step 34 image signal, which is amplified in block 1 and fed to the input of filter 4, where it is converted into a continuous image signal. However, this signal is not suitable for amplification. For this purpose, the output signal of the filter 4 is supplied to the pulse shaper 5 and amplified there. The amplified signal from the output of the imaging unit 5 enters the threshold element 6, where it is compared with the threshold signal received at input 8, and is converted into a two-level black and white facsimile signal. From the output of element 6, the received signal is fed to modulator 7, where its frequency or amplitude modulation is carried out. The low pass filter for the second version of the device contains the first 11 and second 12 resistors, the first 13 and second 14 capacitive elements, the operational amplifier 15 and the resistors 16 and 17, made in the form of potentiometers. Since the amplifier 15 has a positive through element 13 and negative feedback through resistors 16, 17, different frequency characteristics can be realized with their help, including c, as the gain is exceeded, as shown in Fig. 4. The introduction of new components and elements can significantly improve the accuracy of the device.
    FIG. 2
    Jg
    Fig l
    权利要求:
    Claims (3)
    [1]
    1. A device for reading graphic information containing a threshold element, the output of which is the output of the device, a focusing element optically coupled to a light source and to one input of a photoelectric conversion unit, the other input of which is connected to a clock generator, characterized in that, for the purpose of improving the accuracy of the device, it contains a low-pass filter, the input of which is connected to the output of the photoelectric conversion unit, and a pulse shaper, the input of which is connected to the output the filter has lower frequencies, and the output goes to the input of the threshold element.
    s w, 1132803
    [2]
    2. A device for reading graphic information containing a threshold element, the output of which is the output of the device, a focusing element optically coupled to a light source and to one input of a photoelectric conversion unit, the other input of which is connected to a clock pulse generator, characterized in that, in order to improve the accuracy of the device, it contains a low-pass filter, the input of which is connected to the output of the photoelectric conversion unit, and the output is connected to a threshold element.
    [3]
    3. Device pop.2, characterized in that the low-pass filter contains a first resistor connected in series to one input of the first capacitive element, a second resistor connected to the input of the second capacitive element, the operational amplifier whose output is the output of the filter and connected through the third resistor to the fourth resistor connected to the zero potential bus and to the second input of the operational amplifier, the output of the first capacitive element being connected to the output of the operational element.
    类似技术:
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    同族专利:
    公开号 | 公开日
    IT7923239D0|1979-06-04|
    DE2826755A1|1979-12-20|
    FR2429528A1|1980-01-18|
    GB2023371A|1979-12-28|
    JPS551798A|1980-01-08|
    GB2023371B|1983-01-06|
    IT1121563B|1986-04-02|
    AU4816679A|1980-01-03|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB714713A|1951-11-26|1954-09-01|Faximile Inc|Compensator circuit|
    DE2114149C3|1971-03-24|1973-09-20|Robert Bosch Fernsehanlagen Gmbh, 6100 Darmstadt|Amphtude discriminator for a circuit arrangement for generating a correction signal for flank adjustment of pulses|
    US3723649A|1971-04-27|1973-03-27|Electronic Image Syst Corp|Adaptive binary state decision system|
    US3869698A|1973-11-29|1975-03-04|Mohawk Data Sciences Corp|Optical character recognition video amplifier and digitizer|
    DE2720079C3|1977-05-05|1981-11-05|Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel|Method for improving the image quality in facsimile transmission|
    BE857245A|1977-07-28|1977-11-14|Belge Lampes Mat Electr Mble|FAKSIMILE SWITCH|FR2505579B1|1981-05-08|1984-03-09|Agence France Presse|
    JPS59134967U|1983-02-25|1984-09-08|
    EP0120980B1|1983-03-30|1987-06-24|Ibm Deutschland Gmbh|Crosstalk compensation circuit for electro-optical scanning devices|
    EP0148959B1|1983-12-23|1989-02-22|Agfa-Gevaert N.V.|Signal-processing device|
    GB2170373B|1984-12-28|1989-03-15|Canon Kk|Image processing apparatus|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19782826755|DE2826755A1|1978-06-19|1978-06-19|SAMPLE DEVICE|
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