Map scroll method and apparatus for conducting smooth map scroll operation for navigation system
First Claim
1. A map scroll method for a navigation system, comprising the following steps of:
- receiving a scroll signal from an input device operated by a user for scrolling a map image on a monitor screen of the navigation system;
checking a current condition for applying a smooth scroll operation; and
conducting the smooth scroll operation in response to the scroll signal while adjusting a scroll angle of the map image on the monitor screen based on the current condition;
wherein the current condition includes an angle of scroll direction change where the smooth scroll operation is conducted when the angle of scroll direction change is within a predetermined range; and
wherein said step of conducting the smooth scroll operation further includes the following steps of;
determining an amount of scroll direction bias which is an angle to be added in a step by step manner to a previously specified scroll direction when the angle of scroll direction change is within the predetermined range;
determining an amount of update frequency which is a number of times that the scroll direction is updated or modified by adding the scroll direction bias; and
adding the amount of the scroll direction bias to the previously specified scroll direction by the number of times defined by the update frequency.
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Abstract
A display method and apparatus for a navigation system utilizes enables a smooth map scroll operation when a scroll direction is changed sharply. Such a smooth map scroll operation is applied to a situation where such a change of scroll direction is within a predetermined angle range by adding a scroll direction bias for each movement. The display method dynamically adjusts the scroll direction bias and the update frequency depending on the degree of direction change and the available system resources such as a processing speed in the navigation system. Therefore, the navigation system is able to display the smooth operation of the map scroll so that the user is able to recognize the images actually illustrated on the screen and to reach the intended location of the map image quickly and accurately.
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Citations
14 Claims
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1. A map scroll method for a navigation system, comprising the following steps of:
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receiving a scroll signal from an input device operated by a user for scrolling a map image on a monitor screen of the navigation system; checking a current condition for applying a smooth scroll operation; and conducting the smooth scroll operation in response to the scroll signal while adjusting a scroll angle of the map image on the monitor screen based on the current condition; wherein the current condition includes an angle of scroll direction change where the smooth scroll operation is conducted when the angle of scroll direction change is within a predetermined range; and wherein said step of conducting the smooth scroll operation further includes the following steps of; determining an amount of scroll direction bias which is an angle to be added in a step by step manner to a previously specified scroll direction when the angle of scroll direction change is within the predetermined range; determining an amount of update frequency which is a number of times that the scroll direction is updated or modified by adding the scroll direction bias; and adding the amount of the scroll direction bias to the previously specified scroll direction by the number of times defined by the update frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A map scroll apparatus for a navigation system, comprising:
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means for receiving a scroll signal from an input device operated by a user for scrolling a map image on a monitor screen of the navigation system; means for checking a current condition for applying a smooth scroll operation; and means for conducting the smooth scroll operation in response to the scroll signal while adjusting a scroll angle of the map image on the monitor screen based on the current condition; wherein the current condition includes an angle of scroll direction change where the smooth scroll operation is conducted when the angle of scroll direction change is within a predetermined range; and wherein said means of conducting the smooth scroll operation further includes; means for determining an amount of scroll direction bias which is an angle to be added in a step by step manner to a previously specified scroll direction when the angle of scroll direction change is within the predetermined range; means for determining an amount of update frequency which is a number of times that the scroll direction is updated or modified by adding the scroll direction bias; and means for adding the amount of the scroll direction bias to the previously specified scroll direction by the number of times defined by the update frequency. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification