Zooming protection display control system and method of using same

• US 5,721,565 A
• Filed: 06/07/1995
• Issued: 02/24/1998
• Est. Priority Date: 04/29/1994
• Status: Expired due to Term

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Proxima Corporation (Ask ASA)
• Inventors: Nguyen, Hung H.
• Primary Examiner(s): Liang, Regina
• Application Number:
  US08/486,105
• Time in Patent Office: 993 Days
• Field of Search: 345/127, 345/128, 345/129, 345/130, 345/132, 345/143, 345/131, 345/202, 345/203, 345/1, 345/3, 382/232, 382/233
• US Class Current: 345/660
• CPC Class Codes: G06F 3/1475 with conversion of CRT control signals to flat panel control signals, e.g. adapting the palette memory
• CPC Class Codes: G09G 2340/04 Changes in size, position or resolution of an image
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/0414 Vertical resolution change
• CPC Class Codes: G09G 2340/0421 Horizontal resolution change
• CPC Class Codes: G09G 2340/045 Zooming at least part of an image, i.e. enlarging it or shrinking it
• CPC Class Codes: G09G 2340/0464 Positioning
• CPC Class Codes: G09G 2340/0471 Vertical positioning
• CPC Class Codes: G09G 2340/0478 Horizontal positioning
• CPC Class Codes: G09G 2340/0485 Centering horizontally or vertically
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: H04N 5/14 Picture signal circuitry for video frequency region cameras or camera modules comprising electronic image sensors, or control thereof H04N23/00
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor

Abstract

A logic arrangement for causing a display image of a given resolution to be displayed in an adjusted size to accommodate a projection display system, which, in turn, can project the adjusted image. The system also enables an image to be zoomed in size prior to projecting it.

Claims

1. A display method for use with a display device having a display resolution size and at least one video signal source for generating video signals indicative of a video image having a video resolution size, comprising:

providing a timing signal;

storing temporarily the video signals indicative of the video image according to said timing signal;

adjusting the video signals in response to said timing signal to scale the video image in one dimension only for storing the adjusted video signals as stored image information indicative of a stored image having a stored image resolution size;

retrieving said stored image information;

adjusting continuously the retrieved stored image information to cause said adjusted stored image information to be indicative of a scaled image having a scaled resolution size which is about equal to the display resolution size in said one dimension and another dimension for displaying said scaled image on the display device;

said adjusting includes selectively repeating certain ones of the retrieved stored image information indicative of certain ones of the rows or columns of pixel information for the stored image to further scale up said stored image resolution size continuously in said one dimension;

said adjusting further includes selectively eliminating certain other ones of the retrieved stored image information indicative of certain other ones of the rows or columns of pixel information for the stored image to help scale down said stored image resolution size continuously in said another dimension; and

whereby said stored image resolution size is substantially simultaneously scaled up in said one dimension and scaled down in said another dimension to enable said video image to be enlarged for display on the display device.

2. A display method according to claim 1, wherein said adjusting further includes:

selectively repeating certain further ones of the retrieved stored image information indicative of certain further ones of the rows or columns of pixel information for the stored image to further scale up said stored image resolution size continuously in said one dimension during an alternate frame period; and

selectively eliminating certain additional ones of the retrieved stored image information indicative of certain additional ones of the rows or columns of pixel information for the stored image to help scale down said stored image resolution size continuously in said another dimension during said alternate frame period.

3. A display method according to claim 1, wherein said adjusting includes increasing the frequency of a clock signal to generate said timing signal for the purpose of increasing the stored image resolution size in said one dimension only.

4. A display system for use with a display device having a display resolution size and at least one video signal source for generating video signals indicative of a video image having a video resolution size, comprising:

means for providing a timing signal;

means for storing temporarily the video signals indicative of the video image according to said timing signal;

sampling means for adjusting the video signals in response to said timing signal to scale the video image in one dimension only for storing the adjusted video signals as stored image information indicative of a stored image having a stored image resolution size;

means for retrieving said stored image information;

logic means for adjusting continuously the retrieved stored image information to cause said adjusted stored image information to be indicative of a scaled image having a scaled resolution size which is about equal to the display resolution size in said one dimension and another dimension for displaying said scaled image on the display device;

said logic means includes means for selectively repeating certain ones of the retrieved stored image information indicative of certain ones of the rows or columns of pixel information for the stored image to further scale up said stored image resolution size continuously in said one dimension;

said logic means further includes means for selectively eliminating certain other ones of the retrieved stored image information indicative of certain other ones of the rows or columns of pixel information for the stored image to help scale down said stored image resolution size continuously in said another dimension; and

whereby said stored image resolution size is substantially simultaneously scaled up in said one dimension and scaled down in said another dimension to enable said video image to be enlarged for display on the display device.

5. A display system according to claim 4, wherein said logic means further includes:

means for selectively repeating certain further ones of the retrieved stored image information indicative of certain further ones of the rows or columns of pixel information for the stored image to further scale up said stored image resolution size continuously in said one dimension during an alternate frame period; and

means for selectively eliminating certain additional ones of the retrieved stored image information indicative of certain additional ones of the rows or columns of pixel information for the stored image to help scale down said stored image resolution size continuously in said another dimension during said alternate frame period.

6. A display system according to claim 5, wherein said sampling means includes means for increasing the frequency of a clock signal to generate said timing signal for the purpose of increasing the stored image resolution size in said one dimension only.

7. A display system according to claim 4, further including:

data input means for generating a scaling command to facilitate the scaling of the video signals for adjusting them, wherein said scaled image resolution size is defined by a matrix array of the scaled image arranged in N number of rows in said another dimension and M number of columns in said one dimension;

wherein said stored image resolution size is defined by a matrix array of the stored image arranged in n number of rows in said another dimension and m number of columns in said one dimension;

wherein said repeating means includes row gating means responsive to said timing signals and to said data input means for generating row scaling signals to cause the n number of rows of stored pixel information to expand to the N number of rows of scaled pixel information in said another dimension; and

wherein said eliminating means includes column gating means responsive to said data input means and to said timing signals for generating column signals to cause the m number of columns of stored pixel information to be reduced to the M number of columns of scaled pixel information in said one dimension;

whereby said video signal indicative of a video image is converted into said stored image for helping to cause said scaled image to be displayed, where said scaled image is defined by a matrix array of pixel information arranged in N number of rows in said another dimension and M number of columns in said one dimension, where N is substantially larger than n and where M is substantially smaller than m.

8. A display system according to claim 7, further including frame time means means for generating a series of alternating frame time signals indicative of odd frame time periods and even frame time periods.

9. A display system according to claim 8, wherein said column gating means includes column control means for adjusting the pixel image information indicative of pixel images in every X number of columns during even frame time periods and for adjusting the pixel image information indicative of pixel images in every X-1 number of columns during odd frame time periods.

10. A display system according to claim 8, wherein said row gating means includes row control means for duplicating the pixel information indicative of pixel images in every Y number of the n number of rows during even frame time periods and for duplicating the pixel information indicative of pixel images in every Y-1 number of the n number of rows during odd frame time periods.

11. A display system according to claim 7, wherein the image is adjusted by initially increasing the column size of the stored image, by compressing subsequently the increased column size of the stored image to the scaled image continuously as it is being projected, and by expanding subsequently the row size of the stored image continuously to the scaled image as it is being projected.

12. A control system for adjusting the initial size of an image defined by columns and rows to be displayed, comprising:

command means generating a scale command for causing the image to be scaled to a desired size substantially larger than the initial size;

sampling means responsive to said scale command for increasing the image in one dimension only by greatly increasing the number of the initial image columns to provide an initial adjustment of the size of the image to an intermediate size substantially larger than said desired size in said one dimension only;

storage means responsive to the initially adjusted image for storing it temporarily;

control means responsive to the stored initially adjusted image for decreasing the number of the intermediate image columns to be displayed to adjust further the image to said desired size in said one dimension only; and

logic means for inhibiting the display of one of the intermediate image columns and enabling the display of another one of the intermediate image columns during an even frame time, and for inhibiting the display of said another one of the intermediate image columns and enabling the display of said one of the intermediate image columns during an odd frame time;

wherein the display of said one intermediate image column and said another one of the intermediate image columns is averaged over said even frame time and said odd frame time to display the image at said desired size substantially without flicker.

13. A control system according to claim 12, further including a display device for displaying the desired image.

14. A control system according to claim 13, further including processing means responsive to said display device for determining the required memory locations in said storing means for storing the stored initially adjusted image.

15. A control system according to claim 14, wherein said processing means further includes means for clearing additional memory locations adjacent to said memory locations required to store the initially adjusted image to help control the display of the portions of said display image that do not correspond to the image.

16. A display system according to claim 12, wherein said command means further includes means for generating a restore command to cause the image to be stored temporarily in said storage means for enabling the stored image to be substantially duplicated in full size as a portion of said desired image.

17. A display system according to claim 16, wherein said desired image portion is an upper central portion.

18. A control system for adjusting the size of an image to be displayed, comprising:

command means generating a scale command for causing the image to be scaled to a desired size;

sampling means responsive to said scale command for scaling the image in one dimension only, to provide an initial adjustment of the size of the image in said one dimension only;

said storage means responsive to the initially adjusted image for storing it temporarily;

control means further responsive to the stored initially adjusted image for scaling the initially adjusted image to adjust further the image to said desired size in said one dimension only;

said control means further responsive to the stored initially adjusted image for scaling the initially adjusted image in another dimension only, to adjust the image to said desired size in said another dimension;

wherein said sampling means expands the image size in said one dimension; and

logic means for inhibiting alternatingly the display of the initially adjusted image in said one dimension, and for alternately repeating the display of the initially adjusted image in said another dimension, over an even frame time and an odd frame time to enable the display of the initially adjusted image to be averaged over said even frame time and said odd frame time;

wherein the averaged display of the initially adjusted image corresponds to said desired size and is perceived substantially without flicker.

19. A control system according to claim 18, wherein said sampling means includes means for doubling the image size in said one dimension.

20. A control system for adjusting the size of an image to be displayed, comprising:

command means generating a scale command for causing the image to be scaled to a desired size;

sampling means responsive to said scale command for scaling the image in one dimension only, to provide an initial adjustment of the size of the image in said one dimension only;

storage means responsive to the initially adjusted image for storing it temporarily;

control means responsive to the stored initially adjusted image for further scaling the initially adjusted image to adjust further the image to said desired size in said one dimension only;

said control means further responsive to the stored initially adjusted image for scaling the initially adjusted image in another dimension only, to adjust the image to said desired size in said another dimension; and

wherein said control means includes column scaling means for inhibiting the display of a portion of the initially adjusted image in said one dimension during an even frame time, and for inhibiting the display of another portion of the initially adjusted image in said one dimension during an odd frame time, to enable the size of the initially adjusted image to correspond to the desired size in said one dimension during said even frame time and said odd frame time;

wherein the display of said initially adjusted image is averaged over said even frame time and said odd frame time to enable the image to be displayed at said desired size substantially without flicker.

21. A control system according to claim 20, wherein said column scaling mean further includes means for eliminating selected columns of the stored initially adjusted image in said one dimension.

22. A control system according to claim 21, wherein said column scaling means compresses the stored initially adjusted image to said desired image in said one dimension by a compression ratio.

23. A control system according to claim 20, wherein said control means further includes row scaling means for expanding the stored initially adjusted image in said another dimension.

24. A control system according to claim 23, wherein said row scaling means further includes means for repeating selected rows of the stored initially adjusted image in said another dimension.

25. A control system according to claim 24, wherein said row scaling means expands the stored initially adjusted image to said desired image in said another dimension by an expansion ratio.

26. A control system according to claim 23, wherein the image size is scaled from about a 640×

480 matrix array to said desired image size of about a 1024×

720 matrix array.

27. A control system according to claim 23, wherein said one dimension is a horizontal dimension.

28. A control system according to claim 27, wherein said another dimension is a vertical dimension.