Method for displaying an electronic document on a digital handheld device
A method of displaying an electronic document on a digital handheld device first calculates a reduction ratio equal to a ratio of an original document width to the digital handheld device screen width. The method then calculates color values of pixels in a reduced document by processing color values of an array of pixels in the original document. The method builds the reduced document having a size related to the original document by the reduction ratio. Finally, the method displays the reduced electronic document on the digital handheld device screen, and allows a user to switch between the original and reduced documents.
1. A method for displaying an electronic document on a digital handheld device, the digital handheld device comprising a screen on which to view an electronic document, the screen having a plurality of pixels and having a width in pixels and a height in pixels, the method comprising:
providing an original document comprising a plurality of pixels, and a having a width in pixels and a height in pixels;
calculating a reduction ratio equal to a ratio of the original document width to the digital handheld device screen width;
processing color values of a two dimensional array of pixels of the original document;
building a reduced document comprising a plurality of pixels, and having a width in pixels equal to the width of the original document divided by the reduction ratio and a height in pixels equal to the height of the original document divided by the reduction ratio, a color value of each pixel of the reduced document determined by said processing; and
displaying the reduced electronic document on the digital handheld device screen.
2. The method of claim 1 further comprising rounding the reduction ratio up to a nearest integer.
3. The method of claim 2 wherein the array of pixels comprises:
an origin;
a width in pixels having a value equal to or less than the reduction ratio; and
a height in pixels having a value equal to or less than the reduction ratio.
4. The method of claim 3 wherein the origin of the array of pixels is located at an x coordinate of a pixel of the original document that is equal to an x coordinate of a pixel in the reduced document multiplied by the reduction ratio.
5. The method of claim 4 wherein the origin of the array of pixels is located at a y coordinate of a pixel of the original document that is equal to a y coordinate of the pixel in the reduced document multiplied by the reduction ratio.
6. The method of claim 5 wherein each pixel of the original document is used in exactly one array of pixels.
7. The method of claim 1 further comprising displaying a portion of the original document on the digital handheld device screen when a user selects a region of the reduced document.
8. The method of claim 1 wherein the color values of the pixels are RGB color values.
9. The method of claim 1 wherein the original electronic document is a web page.
10. The method of claim 1 further providing a memory in which the original document and the reduced document can be stored.
11. The method of claim 1 wherein the handheld device is a personal digital assistant (PDA), a cellular phone, or a tablet PC.
12. The method of claim 1 wherein the original document width is greater than the digital handheld device screen width.
13. The method of claim 1 wherein the processing of the color values of the two dimensional array of pixels comprises calculating a weighted arithmetic mean of the color values of the two dimensional array of pixels.
14. The method of claim 1 wherein the processing of the color values of the two dimensional array of pixels comprises taking a median value of the color values of the two dimensional array of pixels.
15. The method of claim 1 wherein the processing of the color values of the two dimensional array of pixels comprises determining a numerical mode of the color values of the two dimensional array of pixels.