JPH07234664A - Image display device - Google Patents

Abstract

PURPOSE:To display an image of a desired area on a document fully on the screen of a display part. CONSTITUTION:A scanner 101 reads the document and outputs an image signal of the document. A page memory 106 stores the image signal in a page memory 106. An operation display part 107 is so constituted that an operator can indicates the desired area on the document and image data can be displayed. Then the image signal corresponding to the desired area specified from the operation display part 107 as to the image signal stored in the page memory 106 is read out of the page memory 106, and this read image signal is reduced and stored in a work memory 108. The image signal stored in the work memory 108 is displayed as display image data at an operation display part 107. A system control part 109 performs total control over the blocks (constitution).

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for displaying image data of a read original on a display unit.

[0002]

2. Description of the Related Art Conventionally, an image display device has been proposed which displays a document image when the document image is read by a scanner. However, regardless of the size of the document, the difference between the reading area and the display area can be considered. The original image is displayed with a certain scaling (usually reduction) according to the above. However, when the image on the original is small, the original image is difficult to see,
Alternatively, there is a problem in that even a useless portion (a portion without a document image) is displayed.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to display an image of a desired area on a document on the full screen of the display section.

[0004]

In order to achieve the above object, the present invention provides a display of a desired area in an image display device for displaying image data of a read original on a display unit. An instructing means for instructing the document, and a scaling factor of the original document is determined according to the desired region and the displayable region of the display unit, and the original document corresponding to the desired region instructed according to the scaling factor. A control means for changing the size of the data and displaying it on the display unit is provided.

[0005]

According to the invention of claim 1, in the image display device for displaying the image data of the read document on the display unit, the instruction means for instructing the display of the desired area and the desired area are provided. The scaling ratio of the original is determined according to the displayable area of the display unit, and the original data corresponding to the instructed desired region is scaled according to the scaling ratio and displayed on the display unit. Since the control means for displaying the image is provided, it is possible to display the image of the desired area on the document on the full screen of the display unit.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An overall configuration diagram of an embodiment of the present invention will be described using the digital copying machine having the image work memory shown in FIG.

The scanner 101, which comprises a line image sensor such as a CCD, mechanically scans in the Y direction while electrically scanning in the X direction, reads the original document and serially outputs image signals of the original document. The AGC amplifier 102 is
The input image signal is amplified to a predetermined amplitude. The A / D converter 103 digitizes the amplified image signal.
The image processing unit 104 performs image processing such as shading correction, MTF correction, background removal processing, and halftone processing on the digitized image signal. The image compression unit 105 subjects the image-processed image signal to data compression such as JPEG and orthogonal transformation. The page memory 106 stores the compressed image signal in the X direction on the page memory 106 sequentially and line by line in the Y direction. However, when controlled as a digital copying machine, the image processed image signal is not input to the image compression unit 105, that is, the image data is not compressed and the page memory 106 is not compressed. Is input to and stored in. The operation display unit 107 is configured to allow an operator to indicate a desired area on the document and to display image data. And
Among the image signals stored in the page memory 106, the image signal corresponding to the desired area designated by the operation display unit 107 is read from the page memory 106, and the read image signal is reduced. It is stored in the work memory 108. The image signal stored in the work memory 108 is displayed on the operation display unit 107 as display image data. The system control unit 109 performs overall control of each block (configuration) described above.

Referring to FIGS. 2 and 3, page memory 106
The control of the image signal processing performed by the system controller in the work memory 108 and the processing state of the image data will be described.

S 1: Size data A indicating a desired area designated by the operation display unit 107, operation display unit 10
7, the direction data indicating the display direction (usually, rightward, leftward, or downward) of the display image data on the operation display unit 107, and the size data indicating the displayable area on the operation display unit 107. Each data of data B is taken in. S2: The reduction ratio of the image data in the X and Y directions is calculated based on the size data A and the size data B (size data B / size data A). S 3: Image data stored in the page memory 206
Only the image data in the designated area of the data is reduced in the Y direction based on the reduction rate in the Y direction (the lines are thinned based on the reduction rate in the Y direction) and stored in the work memory 108. . S 4: Image data stored in the work memory 108
The image data is exchanged on the work memory 108 and rotated rightward so that the X and Y directions are reversed. S5: The rotated image data is reduced only in the X direction based on the reduction ratio in the X direction. However, since it is rotated, the lines in the Y direction are thinned based on the reduction ratio in the X direction. S 6: It is determined whether or not the direction data is specified and the normal direction is not specified. S7: When the normal direction is designated, the image data stored in the work memory 108 is exchanged on the work memory 108 so that the X direction and the Y direction are reversed. Turn counterclockwise. S 8: It is determined whether the leftward direction is designated. S9: When the leftward direction is designated, the work
The image data is replaced on the work memory 108 so that the image data stored in the work memory 108 is upside down. S10: It is determined whether the downward direction is designated. S11: Image data stored in the work memory 108
The image data is exchanged on the work memory 108 and rotated rightward so that the X and Y directions are reversed.

When an arbitrary area in the page memory 106 is expanded, the range of the effective data area in the page memory 106 is expanded and scrolled. When enlarging an arbitrary area in the page memory 106, it can be arbitrarily selected as the initial display area.

[0011]

As described above, according to the first aspect of the invention, it is possible to display the image of the desired area on the document on the full screen of the display unit.

[0012]

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention.

FIG. 2 is a flowchart showing the control of the present invention.

FIG. 3 is a schematic diagram showing a processing state of image data according to the present invention.

[Explanation of symbols]

 101 Scanner 102 AGC Amplifier 103 A / D Converter 104 Image Processing Unit 105 Image Compression Unit 106 Page Memory 107 Operation Display Unit 108 Work Memory 109 System Control Unit

Claims (1)

[Claims] 1. An image display device for displaying image data of a read original on a display unit, an instruction means for designating a desired region, and the desired region and a displayable region of the display unit. And a control means for determining a scaling ratio of the document according to the scaling factor, scaling the document data corresponding to the designated desired region according to the scaling ratio, and displaying the scaled document data on the display unit. Characteristic image display device. [0001]