JPS60203067A - Picture data input interface - Google Patents

Abstract

PURPOSE:To transfer the picture data to the picture data processing systems of various specifications by supplying the synchronizing signals of various cycles and levels to a picture reader and controlling the level of the output picture data of side reader. CONSTITUTION:A picture data read request signal is delivered to a picture data input controller CT3 from a picture data processing system 4. Then the CT3 starts a control circuit 11 of a picture data input interface 1, and the circuit 11 starts an external synchronizing output circuit 12. Thus the circuit 12 delivers synchronizing signals 801-803 of prescribed cycles to a picture reader 2 for control of the picture data input area of the reader 2. The reader 2 delivers the input signal of the picture data to a level shift amplifier 14. The amplifier 14 shifts the picture data to a prescribed level and delivers it to a data converter 15. The converter 15 converts the analog picture data into the digital data and delivers it to the system 4 via the CT3. The frequencies of signals 801-803 are changed by varying the clock frequency of a clock generating circuit 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an image data input interface that extracts image data from an image reading device and sends it to an image data processing system.

"Technical background of the invention and its problems" Conventionally, in order to extract image data using an image reading device, it is necessary to supply a synchronizing signal to the image reading device. The following two methods are well known.

One is to create a synchronization signal within the image reading device, and the other one is to create a synchronization signal within the image reading device.
One method is to apply a synchronization signal to the image reading device from the outside. However, the former method requires a synchronization generation circuit within the image reading device, and in some cases requires a synchronization separation circuit on the interface side, resulting in high costs. On the other hand, with the latter method, only a synchronization signal of a fixed frequency and a fixed level can be given to the image reading device, and the image reading device becomes dedicated to a specific device, reducing the versatility of the connected device. The drawback was that it became scarce. Furthermore, this latter method has the disadvantage that image data having different input signal levels cannot be input depending on the type of connected equipment whose image data output channel is fixed.

[Object of the Invention] In view of the above drawbacks, an object of the present invention is to extract high-precision, high-quality image data from an image reading device.

The object of the present invention is to provide an image data input interface that can transfer this data to image data processing systems with various specifications.

"Summary of the invention" The present invention uses a synchronization signal at a predetermined period and level.

an external synchronization output circuit that outputs the image data to the image reading device, and an external synchronization output circuit that enables the image reading device to operate in external synchronization, activates the external synchronization output circuit, and inputs image data from the image reading device to the host system. A control circuit for controlling a control circuit, a data conversion circuit for converting analog image data obtained from an image reading device via a level shift amplifier into digital image data, and a predetermined clock signal for the external synchronization output circuit, control circuit, and data conversion circuit. The above objectives are achieved by using an image data input interface comprising a clock generation circuit that generates a clock.

[Embodiments of the Invention] An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a block diagram showing an embodiment of a system using the image data input interface of the present invention. The image data extracted from the image reading device 2 by the image data input interface 1 is inputted to the image data human-powered controllers 1 to 3 through this interface, and further to the human-powered controller 1.
-Transferred to image data processing system 4 via roller 3.

FIG. 2 is a block diagram showing a detailed configuration example of the image data input interface 1 shown in FIG. The image data input interface 1 includes a control circuit 11, an external synchronization output circuit 12, a clock generation circuit 13, an input signal level shift amplifier 14, and a data conversion circuit 15. The clock generation circuit 13 generates a clock for operating the interface 1, and the input signal level shift amplifier 14 has the function of level shifting and amplifying the input signal 900 in accordance with the input signal 900. The data conversion circuit 15 has a dry circuit 1 that converts the input analog image signal 150 into a digital image signal and outputs the digital image signal to the image data input controller 3 via the line 5. .

Next, the operation of this embodiment will be explained. When the image data processing system 4 outputs the image data reading request signal 100 to the image data input controller 3, the image data input controller 3 outputs the activation signal 200 to one control circuit 11 of the image data input interface 1 to activate it. put on. Then, the control circuit 11 sends enable signals 300 and 400 to the image reading device 2 and the image data input controller 3.
Output. At the same time, the control circuit 11 externally synchronizes the image reading device 2. Signal 500 for controlling
is output to the device 2, and the data strobe signal 6 is output to the device 2.
00 is output to the image data input controller 3. Furthermore, the control circuit 11 sends a start signal 70 to the external synchronization output circuit 12.
Outputs 0 and activates it. Then, the external cycle output circuit 12 outputs synchronization signals 801, 802, and 803 having a predetermined cycle to control the image data input signal to the image reading device 2. The image reading device 2 receiving the synchronization signals 801, 802, and 803 outputs the image data 900 to the input signal level shift amplifier 14. The input signal level shift amplifier 14 shifts the input image data 900 to a predetermined level and outputs it to the data conversion circuit 15. The data conversion circuit 15 converts input analog image data into digital image data and outputs this to the image data input controller 3 through the data bus line 5. The image data input controller 3 takes in image data from the data conversion circuit 15 in response to the data strobe signal 600 output from the control circuit 11, and outputs it to the upper image data processing system 4 through the data bus line 6. Note that the control circuit 11, external synchronization output circuit 12, and data conversion circuit 15 receive clocks 1001, 1002, and 1003 output from the clock generation circuit 13, and each circuit 11, 12, and 15 receives these clocks 10.
01 to 1003 to ensure proper operation. In addition, the synchronization signal 8 generated by the external synchronization output circuit 12
The frequency of 01.802.803 is the clock generation circuit 13
It can be changed by changing the frequency of the clock 1002 outputted from the synchronous output circuit 1002, and further by adjusting the level of these synchronization signals, the amplification factor of the triver stage of the external synchronization output circuit 12, etc. Therefore, the external synchronization horn circuit 12 (J) can supply a wide range of synchronization 8 ranging from low frequency to high frequency to the image reading device 2 at various levels.

According to the tree embodiment, the external synchronization output circuit 12 of the image data input interface 1 receives synchronization signals 801.802.8.
Since the period of 03 can be changed over a wide range from low frequency to high frequency and supplied to the image reading device 2, it is possible to avoid changing the input period of the image data 900, and it is possible to use image data processing systems with various specifications. -M/lI, this image reading device 2 can be combined. In addition, since the level of the image data 900 can be changed by the bell shift amplifier 14 based on the input horn signal, and the external synchronization output circuit 12 can change the level of the synchronization signals 801, 802, and 803, the image reading device 2 and High-precision, high-quality image data 90 regardless of the model of the image data processing system 4
0 can be extracted. Therefore, both of the above effects can significantly improve the versatility of the image reading device 2, and since the external synchronization method is used, it is possible to reduce the complexity of the system.

[Effects of the Invention] As described below, according to the image data input interface of the present invention, when synchronization signals having various periods and levels are supplied to the image reading device, the image data output by the image reading device is Since it is possible to adjust the level of image data and transfer it to an image data processing system, it is possible to extract high-precision, high-quality image data from an image reading device and transfer it to image data systems with various specifications. The versatility of the image reading device can be improved.

[Brief explanation of drawings]

FIG. 1 shows a configuration diagram of an embodiment of a system using the image data input interface of the present invention, and FIG. 2 shows a detailed example of the image data input interface shown in FIG. FIG. 1... Image data input interface 2... Image reading device 3... Image data input controller 4... Image data processing system 11... Control circuit 12... External synchronization output circuit 13
... Clock generation circuit 14 ... Input signal shift amplifier 15 ... Data conversion circuit Patent attorney Noriyuki Chika (1 person) Fig. 1 Fig. 2

Claims (1)

[Claims] An external synchronization output circuit outputs a synchronization signal of a predetermined period and level to the image reading device, and the external synchronization output circuit enables the image reading device to operate in external synchronization. a control circuit that controls input of data to a host system, a data conversion circuit that converts analog image data obtained from the image reading device via a level shift amplifier into digital image data, the external synchronization output circuit, the control circuit, and An image data input interface comprising a data conversion circuit and a clock generation circuit that generates a predetermined clock signal.