Method for visualizing a change caused by scrolling in a scrolling direction of a section of a text and/or graphic displayed on an optical display means
View Patent ↗The invention relates to a method for visualizing a change caused by scrolling in a scrolling direction of a section of a text and/or graphic displayed on an optical display means. A visible marking is thereby displayed at a first position within the displayed section. A visible marking is displayed at a second position within a section displayed during the scrolling prior to or as soon as the first position is no longer within the section displayed during the scrolling in response to the scrolling. In particular with small screens, which are increasingly used for displaying information, which can be visually captured, for example in personal digital assistants, which are referred to as PDAs, or in mobile cellular telephones, the method makes it possible to increase the capability of capturing the displayed information and to thus increase the field of application of these devices.
1. A method for visualizing a change caused by scrolling in a scrolling-direction a section of a text and/or of a graphic displayed on an optical display, said method comprising determining whether a first section displayed comprises at least one sufficiently distinctive element, and, only if said first section does not comprise any sufficiently distinctive element, displaying a visual marker at a first position within the first displayed section.
2. The method according to claim 1 , further comprising determining whether a second section displayed comprises at least one sufficiently distinctive element said second section being the section displayed ere or as soon as the first section is no longer displayed due to the scrolling, and, only if said second section does not comprise any sufficiently distinctive element, displaying a visual marker at a second position within the second section displayed.
3. The method according to claim 1 , further comprising using at least one Fourier-transformation parallel to the scrolling direction for determining whether a particular section displayed comprises at least one sufficiently distinctive element.
4. The method according to claim 3 , the particular section displayed being made up of pixels, said method further comprising using the at least one Fourier-transformation for determining an intensity of at least one lower frequency, and comparing the determined intensity with a first threshold for determining whether the particular section displayed comprises at least one sufficiently distinctive element, wherein the at least one lower frequency has a period length in pixels, which is at least twice as large as the number of pixels of the particular section displayed during scrolling.
5. The method according to claim 1 , further comprising using at least one autocorrelation parallel to the scrolling direction for determining whether a particular section displayed comprises at least one sufficiently distinctive element.
6. The method according to claim 5 , the particular section displayed being made up of pixels, said method further comprising using the at least one autocorrelation for determining an intensity of at least one larger pixel distance, and comparing the determined intensity with a second threshold for determining whether the particular section displayed comprises at least one sufficiently distinctive element, wherein the number of pixel of the at least one larger pixel distance amounts to at least one twentieth of the number of pixels of the particular section displayed during scrolling.
7. The method according to claim 1 , wherein the text and/or the graphic comprises characters, at least a first character in the text and/or the graphic is assigned a value and at least a second character in the text and/or the graphic is assigned the same or another value and analysis with respect to the presence of at least one sufficiently distinctive element is performed by means of the assigned values.
8. The method according to claim 7 , wherein characters are displayed using a first number of pixels of a first colour and a second number of pixels of a second colour, and the value assigned to a character depends on the first number of pixels used for displaying said character and/or the second number of pixels used for displaying said character.
9. The method according to claim 8 , wherein a character is assigned a fixed value unequal to zero if and only if the number of first pixels used for displaying said character is unequal to zero.