Imaging to facilitate object observation

Patent metadata

Field	Value
Publication number	US-2016150950-A1
Application number	US-201414905253-A
Country	US
Kind code	A1
Filing date	Jul 2, 2014
Priority date	Sep 30, 2013
Publication date	Jun 2, 2016
Grant date	—

Abstract

To facilitate observation of object(s), an imaging process can include or an imaging device can perform detecting a position of a focusing point of an eye of a user, determining, according to the position of the focusing point, an object gazed by the user, and changing a size of target imaging of the gazed object on the fundus of the user according to a predetermined zooming rule. The size of the target imaging of the gazed object on the fundus of the user can be automatically changed by optical zooming processing, so that the user can observe the gazed object at a modest distance and with a moderate size of the imaging on the fundus, and therefore it may be convenient for the user to observe the gazed object.

First claim

1 . A method, comprising:
detecting, by a system comprising a processor, a position of a focusing point of an eye of a user, determining, according to the position of the focusing point, a gazed object gazed by the user; and changing a size of target imaging of the gazed object on a fundus of the user according to a predetermined zooming rule.

2 . The method of claim 1 , wherein the changing the size of the target imaging of the gazed object on the fundus of the user according to the predetermined zooming rule comprises:
in the case where the user observes the gazed object for a duration exceeding a preset duration, changing the size of the target imaging of the gazed object on the fundus of the user according to the predetermined zooming rule.

3 . The method of claim 1 , wherein the detecting the position of the focusing point of the eye of the user comprises:
collecting images on the fundus of the user, adjusting an imaging parameter of an optical path between the eye and an image collecting position to collect a set of images with a definition greater than a preset value; processing the images to obtain an equivalent focal length and a direction of line-of-sight of the eye that are corresponding to the set of images with the definition greater than the preset value; obtaining an actual focus distance of the eye according to the equivalent focal length of the eye; and obtaining the position of the focusing point according to the direction of line-of-sight and the actual focus distance.

4 . The method of claim 3 , wherein the processing the images to obtain the equivalent focal length and the direction of line-of-sight of the eye that are corresponding to the set of images with the definition greater than the preset value comprises:
analyzing the images to determine the set of images with the definition greater than the preset value; and determining the equivalent focal length and the direction of line-of-sight of the eye according to the set of images with the definition greater than the preset value and the imaging parameter of the optical path corresponding to the set of images with the definition greater than the preset value.

5 . The method of claim 3 , wherein the method further comprises:
presetting a target focus distance of the eye of the user and a buffer of the target focus distance, wherein, the changing the size of the target imaging of the gazed object on the fundus of the user according to the predetermined zooming rule comprises: changing the size of the target imaging according to the target focus distance, the actual focus distance and the buffer.

6 . The method of claim 5 , wherein the changing the size of the target imaging according to the target focus distance, the actual focus distance and the buffer comprises:
in the case where the actual focus distance is determined to be less than the target focus distance and the actual focus distance is determined to be outside the buffer, increasing the actual focus distance to the target focus distance.

7 . The method of claim 5 , wherein the changing the size of the target imaging according to the target focus distance, the actual focus distance and the buffer comprises:
in the case where the actual focus distance is determined to be greater than the target focus distance and the actual focus distance is determined to be outside the buffer, reducing the actual focus distance to the target focus distance.

8 . The method of claim 5 , wherein the buffer is zero.

9 . The method of claim 1 , wherein the changing the size of the target imaging of the gazed object on the fundus of the user according to the predetermined zooming rule comprises:
determining an actual area proportion of the target imaging on the fundus of the user; determining a corresponding magnification factor according to the actual area proportion; and changing the size of the target imaging according to the corresponding magnification factor.

10 . The method of claim 3 , wherein the changing the size of the target imaging of the gazed object on the fundus of the user according to the predetermined zooming rule comprises:
acquiring a viewing distance from the gazed object to the eye of the user, determining a corresponding magnification factor according to the viewing distance; and changing the size of the target imaging according to the corresponding magnification factor.

11 . The method of claim 10 , wherein the acquiring the viewing distance from the gazed object to the eye of the user comprises:
using the actual focus distance as the viewing distance from the gazed object to the eye of the user.

12 . The method of claim 10 , wherein the position of the focusing point is a first position, and wherein the acquiring the viewing distance from the gazed object to the eye of the user comprises:
tracing the direction of line-of-sight of the eye of the user, acquiring a scene depth of a second position of the gazed object according to the direction of line-of-sight, and determining the viewing distance from the gazed object to the eye of the user according to the scene depth.

13 . The method of claim 10 , wherein the acquiring the viewing distance from the gazed object to the eye of the user comprises:
tracing the directions of line-of-sight of two eyes of the user, and obtaining the viewing distance from the gazed object to the eye of the user according to an intersection point of the directions of line-of-sight of the two eyes of the user.

14 . The method of claim 1 , wherein the method further comprises:
presetting a target area proportion of the target imaging and a buffer of the target area proportion, wherein, the changing the size of the target imaging of the gazed object on the fundus of the user according to a predetermined zooming rule comprises: determining an actual area proportion of the target imaging on the fundus of the user; and changing the size of the target imaging according to the target area proportion, the actual area proportion and the buffer.

15 . The method of claim 14 , wherein the changing the size of the target imaging according to the target area proportion, the actual area proportion and the buffer comprises:
in the case where the actual area proportion is determined to be less than the target area proportion, and the actual area proportion is determined to be outside the buffer, magnifying the target imaging to the target area proportion.

16 . The method of claim 14 , wherein the changing the size of the target imaging according to the target area proportion, the actual area proportion and the buffer comprises:
in the case where the actual area proportion is determined to be greater than the target area proportion, and the actual area proportion is determined to be outside the buffer, reducing the target imaging to the target area proportion.

17 . The method of claim 14 , wherein the buffer is zero.

18 . The method of claim 1 , wherein the changing the size of the target imaging of the gazed object on the fundus of the user according to the predetermined zooming rule comprises:
changing the size of the target imaging of the gazed object on the fundus of the user by optical zooming processing.

19 . An imaging device, comprising:
a processor that executes or facilitates execution of executable units to perform operations of the imaging device, the executable units comprising: a detection unit configured to detect a position of a focusing point of an eye of a user; an object determining unit configured to det

Assignees

• Beijing Zhigu Ruituo Tech Co Ltd

Inventors

• Yu Kuifei
• Du Lin
• Shi Wei

Classifications

• A61B3/12

  for looking at the eye fundus, e.g. ophthalmoscopes (A61B3/13 takes precedence) · CPC title

• G06F3/013 Primary

  Eye tracking input arrangements (G06F3/015 takes precedence) · CPC title

• A61B3/113

  for determining or recording eye movement · CPC title

• A61B3/103

  for determining refraction, e.g. refractometers, skiascopes · CPC title

• A61B3/0025 Primary

  characterised by electronic signal processing, e.g. eye models · CPC title