Process for mapping high resolution data into a lower resolution depiction

• US 5,272,469 A
• Filed: 07/01/1991
• Issued: 12/21/1993
• Est. Priority Date: 07/01/1991
• Status: Expired due to Term

• Current Assignee: NCR Corporation
• Original Assignee: NCR Corporation
• Inventors: Memarzadeh, Kazem
• Primary Examiner(s): Oberley, Alvin E.
• Assistant Examiner(s): GOON, GIN F
• Application Number:
  US07/724,244
• Time in Patent Office: 904 Days
• Field of Search: 340/706, 340/712, 178/18, 178/19, 341/50, 341/57, 341/77, 358/445, 358/447, 358/463
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

A technique for mapping high resolution data into a lower resolution frame, in applications in which the original high resolution data contains a small amount of noise. The improvement is achieved by the introduction of a hysteresis loop into the mapping process.

Claims

1. A process to apply relatively high-resolution data to a relatively low-resolution display so as to minimize distortion resulting from electrical noise, comprising the following steps:

(a) providing a data-capture device capable of producing relatively high resolution separate data points;

(b) providing a display comprising a matrix of pixels, the number of pixels being substantially less than the number of points which can be resolved by the data capture device;

(c) entering data on the data-capture device to produce digitized high resolution data for appearance on said display;

(d) converting said digitized high resolution data from the data capture device into lower resolution data for energizing selected individual pixels of the display by use of direction dependent values which prevents change of the lower resolution data unless a given minimum threshold change in the high resolution data takes place; and

(e) energizing said selected individual pixels of the display.

2. The process of claim 1, in which the use of direction dependent values comprises the use of a hysteresis loop in said converting step.

3. The process of claim 2, in which the step of converting said digitized high-resolution data includes the sub-step of providing a threshold value which is dependent upon the width of the hysteresis loop.

4. The process of claim 2, in which the step of converting said digitized high-resolution data includes the sub-step of determining the value of the lower resolution data in accordance with the direction of the higher resolution data.

5. The process of claim 1, in which the step of providing a data capture device comprises providing a transparent digitizer positioned over the display so that data entered on the data capture device is visible on the display through the transparent digitizer.

6. The process of claim 2, in which said hysteresis loop prevents change of the lower resolution data unless a given minimum change in high resolution data takes place.

7. The process of claim 6, in which the use of the hysteresis loop includes the use of threshold values which are dependent upon the width of the hysteresis loop.

8. The process of claim 7, in which the value of the lower resolution data depends upon the direction of the high resolution data.

9. A process to apply relatively high-resolution data to a relatively low-resolution display so as to minimize distortion resulting from electrical noise, comprising the following steps:

(a) providing a data capture device capable of producing relatively high resolution separate data points;

(b) providing a display comprising a matrix of pixels, the number of pixels being substantially less than the number of points which can be resolved by the data capture device;

(c) entering data on the data capture device to produce digitized high-resolution data HRD for appearance on said display;

(d) providing a scale factor S defining the scale relationship between the high resolution data HRD and lower resolution data LRD;

(e) dividing said high resolution data HRD by said scale factor S to produce a quotient Q and a remainder R;

(f) providing first and second hysteresis threshold values TH1 and TH2;

(g) determining whether remainder R is less than TH1;

(h) if step (g) is true, determining whether a previous lower resolution data value PLRD is less than the quotient Q;

(i) if step (h) is true, setting the lower resolution at a value LRD equal to Q-1;

(j) if step (h) is not true, setting the lower resolution data value LRD equal to Q;

(k) following steps (i) or (j) as applicable setting a previous lower resolution data value LRD and returning to step (c) to generate another graphical information value;

(l) if step (g) is not true, determining whether R is greater than TH2;

(m) if R is not greater than TH2, setting the lower resolution data value LRD equal to Q, setting a previous lower resolution data value PLRD equal to the lower resolution data value LRD and returning to step (c);

(n) if R is greater than TH2, determining whether the previous lower resolution data PLRD is greater than Q,

(o) if PLRD is not greater than Q, setting the lower resolution data value LRD equal to Q, setting a previous lower resolution data value PLRD equal to the lower resolution data value LRD and returning to step (c);

(p) if PLRD is greater than Q, setting the lower resolution data LRD equal to Q+1 and then setting the previous lower resolution data PLRD equal to LRD and returning to step (c); and

(q) applying the lower resolution data LRD to the display.

10. The process of claim 9, in which a hysteresis loop is employed in providing the transition from high resolution positional data to lower resolution positional data.

11. The process of claim 10, in which the threshold value TH1 is selected to be half the width of the hysteresis loop.

12. The process of claim 11, in which the threshold value TH2 is determined by subtracting TH1 from the scale value S.

13. The process of claim 9, in which the digitizer screen is transparent and the display is positioned beneath the digitizer screen and is visible therethrough.

14. The process of claim 9, in which the data capture device includes electronic control circuitry and in which the process is implemented in a data processor coupled to said electronic control circuitry and to said display.