US 6,641,269 B2Granted

Indicated position detection by multiple resolution image analysis

AssigneeSeiko Epson Corporation

InventorTakayuki Kitazawa

Life of this patent

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Abstract

An image of the display screen including an indicated position is captured, and a low resolution image is produced from the captured high resolution image. A low resolution pixel corresponding to the indicated position is found within the low resolution image, and the indicated position is then found within the captured image based on a unit area that is associated with the low resolution pixel corresponding to the indicated position. A resolution of the low resolution image is determined by finding integers A and B so that a value f given by f = X × Y A × B + A × B is at a minimum, where X denotes a number of high resolution pixels of the captured image in a horizontal direction, Y denotes a number of high resolution pixels of the captured image in a vertical direction, and A denotes a number of high resolution pixels of the unit area in the horizontal direction, and B denotes a number of high resolution pixels of the unit area in the vertical direction. A and B are divisors of X and Y, respectively.

Claims3

Dependent claims

A method of detecting an indicated position on a display screen that is indicated by a user, comprising the steps of:

(a) capturing an image of the display screen that includes the indicated position, the captured image including a plurality of high resolution pixels;
(b) producing a low resolution image with lower resolution than the captured image based on the captured image, the low resolution image including a plurality of low resolution pixels, each of the low resolution pixels being associated with respective unit areas within the captured image, the each unit area including a predetermined number of high resolution pixels;
(c) finding a low resolution pixel corresponding to the indicated position within the low resolution image;
and
(d) finding the indicated position within the captured image based on a unit area that is associated with the low resolution pixel corresponding to the indicated position,
wherein the number of high resolution pixels in the each unit is selected so that a summation of the number of the high resolution pixels in the each unit and a number of the units in the captured image has a minimum value, the number of the units in the captured image being defined as a function of the number of high resolution pixels in the each unit and the total number of the high resolution pixels in the captured image.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/219,492Filed 16 Aug 2002 · continuation
Priority: JP 2000-08410124 Mar 2000
Published: US 2003/0043350 A16 Mar 2003
Granted: 4 Nov 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G06F 3/0425
By opto-electronic means: using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of…
H04N 5/74
Details of television systems: projection arrangements for image reproduction, e.g. using eidophor
G06F
Computing and data processing
H04N
Pictorial communication

Family

Application09/810,619Parent of this continuation · filed 19 Mar 2001
US 2003/0043350 A1Pre-grant publication · published 6 Mar 2003
US 6,454,419 B2Parent of this continuation
US 2001/0055060 A1Published application
US 6,641,269 B2This patent

From the US filing history. Foreign family members aren’t listed.