JPH0581396A - Image input device - Google Patents

Abstract

PURPOSE:To display an image read on the displaying screen and to use the source image data with good operability and high resolution for the image processing after the input processing even when the reading with the high resolution is performed. CONSTITUTION:The device is equipped with a reading means to read an image at the one line unit by the manual scanning, an image data reducing means to perform the reducing processing to the source image data read by an image input device and output data for displaying, an output means 108 to output the source image data as they are, without performing the reducing processing to the source image data, a displaying means 107 to display the reduced image data and a storing means 104 to store the image data which are not reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input device such as a document editing device having an image editing function.

[0002]

2. Description of the Related Art A device for reading an image by manual scanning is
Since the operator manually scans, if the display is performed while reading, it can be confirmed whether the reading is normally performed, the reading position can be confirmed, and the operability is improved.

For this reason, in the prior art, the read image data is reduced and displayed simultaneously with the reading. However, the source data before reduction is not stored here, and the reduced data is used as the original data for processing such as enlargement / reduction and black-and-white inversion and the original data for output such as printing.

Further, Japanese Patent Application Laid-Open No. 60-158 discloses that when the manual scanning of the image reading apparatus by the manual scanning is too fast, the fact that the image cannot be accurately read is displayed. It is necessary for the operator to operate so as not to exceed the limit value of the manual scanning speed, and if the limit value of the sub-scanning speed is low, the operator has to intentionally operate at a low speed, which deteriorates the operability. Shows.

[0005]

Since the reduction ratio of the reduced data for display becomes large as the resolution of image reading becomes high, the reduced data for display is used as the original data for image processing and output as in the prior art. In that case, it is no problem to read high-definition images at low resolution without taking advantage of them. Therefore, there is a problem that the source image data of high resolution must be stored at the same time as the reduced display for improving the operability.

An object of the present invention is to read an image according to the size of a display screen at the same time as reading without lowering the limit value of the manual scanning speed at the time of reading by an image input device for reading an image by high resolution manual scanning. The reduced image is displayed to provide good operability to the operator, and at the same time, the reduced image display at the time of reading is performed, and at the same time, the source image data is stored in the storage device to be used for the image processing and output. The purpose is to make it available as original data.

[0007]

[Means for Solving the Problems] 1 by manually scanning an image
Reading means for reading in line units, image data reducing means for reducing the source image data read by the image input device and outputting display data, and reducing processing for the source image data This can be achieved by providing an output means for outputting the source image data as it is, a display means for displaying the reduced image data, and a storage means for storing the source image data.

[0008]

The image data reducing means performs reduction processing when data is input from the image input device, and the reduced data is transferred to the display control device and displayed. Further, in parallel with this, the original image data that is not reduced is transferred to and stored in the storage device. As a result, the source image data and the display image data are simultaneously generated by reduction processing at the time of inputting the image data, and since the two data can be transferred separately, high-speed transfer becomes possible and manual operation speed is improved. Never lower the limit.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment in which a document editing device is constructed using the image input device according to the present invention.

The document editing apparatus is a central processing unit (hereinafter C
PU) 101, a storage device 104 including a random access memory or a non-volatile memory, a keyboard 105 that is a character data input device, and a display control device 10 that includes a frame memory (not shown) that holds display data.
6, a display device 107 such as a cathode ray tube or liquid crystal, an output device 108 including a printer, an image input device 102 for inputting an image by manual scanning, an image input device 10
The serial image signals sent from 2 are converted to parallel, and
The image input I / F unit 103 for reducing the image signal is used.

The operation of the document editing apparatus is as follows:
In accordance with the program stored in the display device, an operator inputs a kana, kanji or alphanumeric characters from the keyboard 105, which is an input device, or displays an image input from the image input device 102 on the display device 107 through the display control device 106. The edited document is displayed on the screen, and the operator confirms the edited document on the display and prints it on the output device 108 such as a printer to obtain a desired document.

Next, the image input device 102 for inputting an image according to the present invention by manual scanning will be described.

The image input device 102 reads an image as serial data for each line in the main scanning direction and generates a write clock signal in synchronization with the serial image data. The write clock indicates that the image data has been determined, and the image input I / F unit 103 can receive the data by this signal. The sub-scan is manually performed, but a line clock signal is generated when the line to be main-scanned moves to the next line.

Next, the image input I / F unit 10 according to the present invention.
3 will be described.

The image input I / F unit 103 receives the serial image data from the image input device 102 and the image data in accordance with the write clock signal, and serializes the image data into parallel data of a plurality of bit units which can be easily handled by the information processing device. Convert. At this time, the source image data that is not subjected to the reduction processing for image data processing and the reduced image data are serially / parallel converted at the same time. Then, the parallel source image data that is not reduced is transferred to the storage device 104, and the reduced parallel image data is transferred to the display control device 106.

FIG. 2 is a detailed block diagram of the image input I / F unit 103 which is an embodiment of the present invention. In this example,
For simplicity, the reduction method is thinning out bits. The operation will be described in detail below.

The part for converting the unreduced source image data into serial / parallel is a 16-bit shift register 201, a hexadecimal counter 202, and a 16-bit latch 203. The 16-bit shift register 201 is a 16-bit serial input shift register. Therefore, the serial image data is sequentially shifted by the write clock, and the serial data is converted into parallel data. The hexadecimal counter 202 detects that the data of the 16-bit shift register 201 is full by counting the write clock,
The 6-bit latch 203 is instructed to latch the data, and the transfer request signal 2 for the latched source image data is sent.
08 is generated. The 16-bit latch 203 holds the parallel image data converted by the 16-bit shift register 201 for storage in the storage device 104.

The source image data transfer request signal 208 is C
The source image data sent to the PU 101 and held in the 16-bit latch 203 is transferred to the storage device 104 and stored every 16 bits. The source image data stored in the storage device 104 is used at the time of later image editing and output.

The 16-bit shift register 20 is the part that performs serial-to-parallel conversion of source image data while performing reduction processing.
4, a write clock mask circuit 205, a hexadecimal counter 206, and a 16-bit latch 207, where 204 is 20
The same operation as 1 is performed. Write clock mask circuit 20
5 masks the write clock according to the reduction ratio. Image data to be written in the 16-bit shift register 204 can be thinned out by the write clock after the masking. The hexadecimal counter 206 detects that the data in the 16-bit shift register 204 is full by counting the write clock after masking, and instructs the 16-bit latch 207 to latch the data. A transfer request signal 209 for the latched reduced image data to the display device is generated.

The reduced image data transfer request signal 209 is sent to the CPU 101, and the reduced image data held in the 16-bit latch 207 is transferred to the frame memory of the display control device 106 every 16 bits. At this time, since the address of the frame memory corresponds to the display position of the display screen, the CPU 101 calculates the storage address of the frame memory by referring to the line clock signal 210 and the like. The display control device 106 converts the display data in the frame memory into an interface signal for the display device 107 and operates the display device 107 to display it.

As a result, the reduced image for one line is displayed on the display device 108.

Next, the write clock mask circuit 205 will be described in detail. FIG. 3 is a configuration example of the write clock mask circuit. In this configuration example, the mask pattern is 8
Since the bit configuration is adopted, the reduction ratio is n / 8 (n is an integer from 1 to 8), and the 8-bit shift register 301
And an AND circuit 301. The reduction ratio is determined according to the image reading resolution and the size and resolution of the display screen.

A mask pattern is stored in the 8-bit shift register 301, and a mask pattern output signal is generated while shifting by 1 bit by a write clock signal. The mask pattern is set in the 8-bit shift register 301 by the CPU 101. The mask pattern output signal is input again from the serial input of the 8-bit shift register 301 and circulates inside the 8-bit shift register to continuously generate the mask pattern output.
The logical product circuit 302 takes the logical product of the mask pattern output and the write clock to generate a masked clock. The masked clock signal is sent to the 16-bit shift register 204 and hexadecimal counter 206.

FIG. 4 shows the mask pattern as 010100.
It is a time chart when it is set to 10. When the mask pattern output from the 8-bit shift register 301 is 0, the write clock is masked and is not output to the masked clock, and when it is 1, the write clock is not masked and is output to the masked clock. As described above, the masked clock is generated, which causes the image input device 102 to operate.
By skipping the serial image data from, the image data can be thinned out.

In this way, the image input I / F unit 103
Can thin out data in the main scanning direction with respect to display data to be reduced. Further, the thinning-out of the data in the sub-scanning direction can be thinned out for each line by the CPU 101 controlling the transfer determining and transferring the data for each line based on the line clock signal 210. ..

As described above, the image input I / F unit 103 can simultaneously generate reduced data for display and source image data for image processing for output, and reduce the image while manually reading the image. Display and storage of source image data in a storage device can be performed. Thereby, good operability can be provided without lowering the limit value of the manual scanning speed.

Although the CPU is used to transfer the reduced display data in this embodiment, a dedicated transfer means may be provided.

[0028]

According to the present invention, even in a manually scanned image input device having a high resolution, an image reduced at the same time as reading can be displayed in accordance with the size and resolution of the display screen, and a source not reduced. By storing the image data in the storage device, it can be used as the original data for image processing and output. At this time, since the manual scanning speed is not reduced, the operability is good for the operator. Can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram of a document editing apparatus configured by using an image input apparatus according to the present invention.

FIG. 2 is a block diagram of an image input I / F unit according to the present invention.

FIG. 3 is a block diagram of a write mask circuit according to the present invention.

FIG. 4 is a write mask circuit time chart according to the present invention.

[Explanation of symbols]

101 ... Central processing unit (CPU), 102 ... Manual scanning image input device, 103 ... Serial-parallel conversion of image data,
Further, an image input I / F unit for reducing the source image data,
Reference numeral 104 ... Storage device, 105 ... Keyboard that is an input device for character data, 106 ... Display control device, and internally has a frame memory that stores display data, 107
... display device such as CRT display or liquid crystal display, 108 ... output device such as printer, 201, 204 ...
16-bit shift registers for converting serial image data in parallel, 202, 206 ... 16-bit counters for counting the number of bits of image data, 203 ... Latches for holding non-reduced image data in 16-bit units, 205 ...
A mask circuit for masking the write clock corresponding to the image data to be thinned out, 207 ... A latch for holding the lowering image data in 16-bit units for reduction processing, 208 ... Source image data transfer request signal, 209 ... Reduced image data transfer request signal , 210 ... Line clock signal, 301 ... 8-bit shift register, 302 ... AND circuit.

Claims (2)

[Claims] 1. A reading means for reading an image by one line unit by manual scanning, and an image data reducing means for reducing source image data read by an image input device and outputting display data. An output unit that outputs the original image data as it is without performing reduction processing on the original image data; a display unit that displays the reduced image data; and a storage unit that stores the original image data. Characteristic image input device. 2. A document editing device comprising the image input device according to claim 1.