EP0085351A2
Expired / Lapsed
EP
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Picture information display device
Assignee: Toshiba Corp
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Filing: 1983-01-18
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Granted: —
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Expires: 2003-01-18
Abstract
Abstract A picture information display device having a control circuit (1) for determining a reductive ratio which is set in a size converting circuit (14) in accordance with the size of an original and the size of a display area at a display unit (16). ' The size converting circuit (14) reduces the size of the picture information read out from a page buffer memory (5) of the control circuit (1) in accordance with the reductive ratio. The readout picture information is stored in a refresh memory (60) of a display interface (15). The display unit (16) displays the size-reduced picture information of the refresh memory (60). The reductive ratio is so selected that the picture information stored in the refresh memory (60) is displayed over the entire region of a display area of the display unit (16)
Inventors
- 👤 Kazuhiko Iida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 10:40
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/32; H04N1/32502; H04N1/32507; H04N1/32512; H04N1/32523; H04N1/32529; H04N1/387; H04N1/393; H04N1/3935; H04N2201/00; H04N2201/0077; H04N2201/0081; H04N2201/0082; H04N2201/0087; H04N2201/0089
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
289 words
A picture information display device having: display means for displaying picture information; scanning means for scanning the picture information on an 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 and to produce control signals; size reduction circuit means connected to said control circuit means, for reducing, in accordance with a predetermined reductive ratio, a size of the picture information read out from said page buffer memory; and a display interface connected to said size reduction circuit means and having a refresh memory for storing size-reduced picture information, said display interface being adapted to produce a display signal to said display means in accordance with a storage content of said refresh memory, characterized in that: said scanning means (7) further detects the size of the original; said control circuit means (1) determines the reductive ratio of the picture information read out from said page buffer memory in accordance with a detected size of the original and a size of a display area of said display means (16); said size reduction circuit means (14) reduces, in accordance with the reductive ratio the size of the picture information read out from said page buffer memory (5); and said display interface means (15) has said refresh memory (60) having a storage capacity corresponding to the picture information for at least one page of the original and produces the display signal in accordance with the storage content of said refresh memory (60), 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.
Claim 2
Dependent Claim
289 words
A picture information display device having: display means for displaying picture information; scanning means for scanning the picture information on an 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 and to produce control signals; size reduction circuit means connected to said control circuit means, for reducing, in accordance with a predetermined reductive ratio, a size of the picture information read out from said page buffer memory; and a display interface connected to said size reduction circuit means and having a refresh memory for storing size-reduced picture information, said display interface being adapted to produce a display signal to said display means in accordance with a storage content of said refresh memory, characterized in that: said scanning means (7) further detects the size of the original; said control circuit means (1) determines the reductive ratio of the picture information read out from said page buffer memory in accordance with a detected size of the original and a size of a display area of said display means (16); said size reduction circuit means (14) reduces, in accordance with the reductive ratio the size of the picture information read out from said page buffer memory (5); and said display interface means (15) has said refresh memory (60) having a storage capacity corresponding to the picture information for at least one page of the original and produces the display signal in accordance with the storage content of said refresh memory (60), 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.
Claim 3
Dependent Claim
39 words
A device according to claim 1, characterized in that the reductive ratio is a value to display the picture information stored in said refresh memory (60) with a constant size on the display area of said display means (16).
Claim 4
Dependent Claim
100 words
A device according to claim 1, characterized by further comprising operating means (2, 92), said operating means being adapted to designate a shift of a desired area within said refresh memory (60) and to designate a shift of a zoom-up region (S) 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 (S) has a priority over the other thereof in accordance with a relationship between a memory area of said refresh memory (60) and the desired area specified within the memory area.
Claim 5
Dependent Claim
42 words
A device according to claim 3, characterized in that said display means (16) displays the picture information corresponding to the desired area specified by said operating means (2, 92) and displays the zoom-up region specified within the desired area with a cursor.
Claim 6
Dependent Claim
192 words
A device according to claim 1, characterized in that said size reduction circuit (14) comprises: a register (401 to 412) connected to said control circuit means (1) to sequentially read out and store, in correspondence with each of the desired areas with respect to X- and Y-axes, the picture information which is stored in said page buffer memory (5); a position determining circuit (430, 431) connected to said control circuit means (1) to determine 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 (5); and an arithmetic operation circuit (415, 427, 432 to 435) connected to said register (401 to 412) and to said position determining circuit (430, 431), to compute a distance between the dot of the size-reduced picture information and a corresponding dot of the picture information stored in said register (401 to 412) and to determine 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.
Claim 7
Dependent Claim
130 words
A device according to claim 1, characterized in that said display interface means (15) comprises: said refresh memory (60) having a storage capacity for storing the picture information corresponding to at least one page of the size-reduced original; a first address designating circuit (63) connected to said refresh memory (60) to designate addresses along the X- and Y-axes of said refresh memory (60) so as to write the picture information; a second address designating circuit (66) connected to said refresh memory (60) to designate addresses along the X- and Y-axes of said refresh memory (60) so as to read out the picture information; and a shift-register (74) connected to said refresh memory (60) to temporarily store readout picture information and to produce the readout picture information at a predetermined timing.
Claim 8
Dependent Claim
26 words
A device according to claim 1, characterized in that said display means (16) displays the original size information at a specified area of the display area.
Claim 9
Dependent Claim
188 words
A device according to claim 4, characterized in that said display interface means (15) comprises: said refresh memory (60) having a storage capacity for storing the picture information corresponding to at least one page of the size-reduced original; a first address designating circuit (63) connected to said refresh memory (60) to designate addresses along the X- and Y-axes of said refresh memory (60) so as to write the picture information; a second address designating circuit (66) connected to said refresh memory (60) to designate addresses along the X- and Y-axes of said refresh memory (60) so as to read out the picture information; a shift-register (74) connected to said refresh memory (60) to temporarily store readout picture information and to produce the readout picture information at a predetermined timing; a cursor signal generator (80) for generating a cursor signal to display the picture image with a cursor within the display area of said display means (16); and a synthesizing circuit (200) connected to said cursor signal generator (80) and to said shift-register (74) to synthesize the picture information read out from the shift-register (74) with the cursor signal.
Claim 10
Dependent Claim
141 words
A device according to claim 6, characterized in that said second address designating circuit (66) comprises: a first address register (68) for storing a Y address of said refresh memory (60) which is supplied from said control circuit means (1); an X address register (67a) for designating the X address of said refresh memory (60); a Y address register (67b) 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 (60) when said X address register (67a) completes designating all addresses along the X-axis; and a circuit (69) connected to said Y address register (67b) to set a storage content of said first address register (68) in said Y address register (67b) when said Y address register (67b) completes designating all addresses along the Y-axis.
References Cited (Backward Citations)
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