Picture information display device

• US 4,520,399 A
• Filed: 01/18/1983
• Issued: 05/28/1985
• Est. Priority Date: 01/29/1982
• Status: Expired due to Term

• Current Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
• Original Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
• Inventors: Iida, Kazuhiko
• Primary Examiner(s): Britton, Howard W.
• Assistant Examiner(s): Peng, John K.
• Application Number:
  US06/458,877
• Time in Patent Office: 861 Days
• Field of Search: 358/256, 358/280, 358/284, 358/287, 358/77, 358/903
• US Class Current: 358/451
• CPC Class Codes: H04N 1/32502 in systems having a plurality of input or output devices
• CPC Class Codes: H04N 1/32512 of different type, e.g. internal and external devices
• CPC Class Codes: H04N 1/32529 of different type, e.g. internal and external devices
• CPC Class Codes: H04N 1/3935 with modification of image resolution, i.e. determining the values of picture elements at new relative positions
• CPC Class Codes: H04N 2201/0081 Image reader H04N2201/0091 - H04N2201/0094 take precedence
• CPC Class Codes: H04N 2201/0082 Image hardcopy reproducer H04N2201/0091 - H04N2201/0094 take precedence
• CPC Class Codes: H04N 2201/0087 Image storage device
• CPC Class Codes: H04N 2201/0089 Image display device

Abstract

A picture information display having a control circuit for determining a reductive ratio which is set in a size converting circuit in accordance with the size of an orginal and the size of a display area at a display unit. The size converting circuit reduces the size of the picture information read out from a page buffer memory of the control circuit in accordance with the reductive ratio. The readout picture information is stored in a refresh memory of a display interface. The display unit displays the size-reduced picture information of the refresh memory. The reductive ratio is so selected that the picture information stored in the refresh memory is displayed over the entire region of a display area of the display unit.

Claims

1. A picture information display device, comprising:

display means for displaying picture information;

scanning means for scanning the picture information on an original and detecting a size of the original;

control circuit means connected to said scanning means and having a page buffer memory, said control circuit means being adapted to store the picture information in said page buffer memory, to determine a reductive ratio of the picture information read out from said page buffer memory in accordance with a relationship between a detected size of the original and a size of a display area, and to produce control signals;

size reduction circuit means connected to said control circuit means, for reducing, in accordance with the reductive ratio, a size of the picture information read out from said page buffer memory; and

display interface means connected to said size reduction circuit means and having a refresh memory for storing size-reduced picture information which corresponds to at least one page of the original, said display interface means being adapted to store the size-reduced picture information in said refresh memory, and to produce a display signal to said display means in accordance with a storage content of said refresh memory, whereby said display means displays with a constant size regardless of the original size the picture information which is produced by reducing the contents of said page buffer memory.

2. A device according to claim 1, wherein the reductive ratio is a value to display the picture information stored in said refresh memory with a constant size on the display area of said display means.

3. A device according to claim 1, wherein said size reduction circuit comprises:

means, connected to said control circuit means, for storing local pieces of picture information;

a position determining circuit connected to said control circuit means, for determining a position of a dot of a size-reduced picture image, in accordance with the reductive ratio, along the X- and Y-axes of the picture information stored in said page buffer memory; and

an arithmetic operation circuit, connected to said storing means and to said position determining circuit, for computing a distance between the dot of the size-reduced picture information and a corresponding dot of the picture information stored in said storing means and for determining a logical value of the dot of the size-reduced picture image in accordance with the distance between the dot of the size-reduced picture and the corresponding dot and logical values thereof.

4. A device according to claim 1, wherein said display means comprises means for displaying the original size information at a specified area of the display area.

5. A device according to claim 1,

wherein said refresh memory has a storage capacity for storing the picture information corresponding to at least one page of the size-reduced original, and

wherein said display interface means comprises in addition to said refresh memory:

a first address designating circuit connected to said refresh memory to designate addresses along the X- and Y-axes of said refresh memory so as to write the picture information;

a second address designating circuit connected to said refresh memory to designate addresses along the X- and Y-axes of said refresh memory so as to read out the picture information; and

a shift-register connected to said refresh memory to temporarily store readout picture information and to produce the readout picture information at a predetermined timing.

6. A device according to claim 5, wherein said second address designating circuit comprises:

a first address register for storing a Y address of said refresh memory which is supplied from said control circuit means;

an X address register for designating the X address of said refresh memory;

a Y address register connected to said X address register, to increase a count corresponding to the Y address so as to designate the Y address of said refresh memory when said X address register completes designating all addresses along the X-axis; and

a circuit connected to said Y address register to set a storage content of said first address register in said Y address register when said Y address register completes designating all addresses along the Y-axis.

7. A device according to claim 1, further comprising operating means, said operating means being adapted to designate a shift of a desired area within said refresh memory and to designate a shift of a zoom-up region at a desired position within the desired area such that one of a shift designation of the desired area and a shift designation of the zoom-up region has a priority over the other thereof in accordance with a relationship between a memory area of said refresh memory and the desired area specified within the memory area.

8. A device according to claim 7, wherein said display means displays the picture information corresponding to the desired area specified by said operating means and displays the zoom-up region specified within the desired area with a cursor.

9. A device according to claim 8, wherein

said refresh memory has a storage capacity for storing the picture information corresponding to at least one page of the size-reduced original;

and wherein said display interface means comprises

a first address designating circuit, connected to said refresh memory, for designating addresses along the X- and Y-axes of said refresh memory so as to write the picture information;

a second address designating circuit, connected to said refresh memory, for designating addresses along the X- and Y-axes of said refresh memory so as to read out the picture information;

a shift-register, connected to said refresh memory, for temporarily storing readout picture information and producing the readout picture information at a predetermined timing;

a cursor signal generator for generating a cursor signal to display the picture image with a cursor within the display area of said display means; and

a circuit, connected to said cursor signal generator and to said shift-register, for synthesizing the picture information read out from the shift-register with the cursor signal.