Information processing method and electronic device

Patent metadata

Field	Value
Publication number	US-9538066-B2
Application number	US-201414499866-A
Country	US
Kind code	B2
Filing date	Sep 29, 2014
Priority date	Mar 3, 2014
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

An information processing method and an electronic device are provided. The method includes: controlling a first lens of a first image acquisition unit to move from a first position in a first direction, and controlling a second lens of a second image acquisition unit to move from the first position in a second direction opposite to the first direction; obtaining at least one first focus value in a first focus area corresponding to the first image acquisition unit during said moving in the first direction, and obtaining at least one second focus value in a second focus area corresponding to the second image acquisition unit during said moving in the second direction; performing a first calculation on the at least one first focus value and the at least one second focus value to obtain a third focus value; and controlling the first and second image acquisition units to implement focusing based on the third focus value.

First claim

What is claimed is:

1. An information processing method applied to an electronic device comprising a first image acquisition unit and a second image acquisition unit, the method comprising:
a coarse focusing step comprising, in a first focusing range:
controlling a first lens of the first image acquisition unit to move from a first position in a first direction, and controlling a second lens of the second image acquisition unit to move from the first position in a second direction opposite to the first direction;
obtaining at least one first focus value in a first focus area corresponding to the first image acquisition unit during said moving in the first direction, and obtaining at least one second focus value in a second focus area corresponding to the second image acquisition unit during said moving in the second direction;
performing a first calculation on the at least one first focus value and the at least one second focus value to obtain a third focus value; and
controlling the first and second image acquisition units to implement focusing based on the third focus value by moving the first and second lenses to a second position corresponding to the third focus value; and

a fine focusing step comprising, in a second focusing range smaller than the first focusing range:
controlling the first lens of the first image acquisition unit to move from the second position in the first direction, and controlling the second lens of the second image acquisition unit to move from the second position in the second direction;
obtaining at least one fourth focus value in the first focus area corresponding to the first image acquisition unit during said moving in the first direction, and obtaining at least one fifth focus value in the second focus area corresponding to the second image acquisition unit during said moving in the second direction;
performing a second calculation on the at least one fourth focus value and the at least one fifth focus value to obtain a sixth focus value; and
controlling the first and second image acquisition units to implement focusing based on the sixth focus value by moving the first and second lenses to a third position corresponding to the sixth focus value,

wherein the first position is a position, at which the first lens and the second lens are driven respectively by a first driving unit and a second driving unit to arrive when a driving pulse has a first duty cycle,
wherein said controlling the first lens to move from the first position in the first direction and controlling the second lens to move from the first position in the second direction opposite to the first direction further comprises:
controlling the driving pulse to change from the first duty cycle to a second duty cycle different from the first duty cycle, so as to control the first lens to move from the first position in the first direction; and
controlling the driving pulse to change from the first duty cycle to a third duty cycle different from both the first duty cycle and the second duty cycle, so as to control the second lens to move from the first position in the second direction, and
wherein the first duty cycle is smaller than the second duty cycle and larger than the third duty cycle; or the first duty cycle is smaller than the third duty cycle and larger than the second duty cycle.

2. The method according to claim 1 , wherein, said obtaining at least one first focus value in a first focus area corresponding to the first image acquisition unit during said moving in the first direction, and obtaining at least one second focus value in a second focus area corresponding to the second image acquisition unit during said moving in the second direction further comprises:
obtaining first pixel values in the first focus area and obtaining first gradient information based on the first pixel values;
obtaining the at least one first focus value by performing a global ramping algorithm, a fast ramping algorithm or a global stepwise ramping algorithm on the first gradient information;
obtaining second pixel values in the second focus area and obtaining second gradient information based on the second pixel values; and
obtaining the at least one second focus value by performing the global ramping algorithm, the fast ramping algorithm or the global stepwise ramping algorithm on the second gradient information.

3. The method according to claim 2 , wherein, said performing a first calculation on the at least one first focus value and the at least one second focus value to obtain a third focus value further comprises:
comparing each focus value of the at least one first focus value with each focus value of the at least one second focus value to obtain a maximum focus value; and
determining the obtained maximum focus value as the third focus value.

4. The method according to claim 3 , wherein, said controlling the first and second image acquisition units to implement focusing based on the third focus value further comprises:
obtaining a fourth duty cycle based on the third focus value; and
the first driving unit driving the first lens to move to a second position corresponding to the third focus value based on the fourth duty cycle, so that the first image acquisition unit implements focusing; and the second driving unit driving the second lens to move to the second position corresponding to the third focus value based on the fourth duty cycle, so that the second image acquisition unit implements focusing.

5. An electronic device, comprising:
a first image acquisition unit;
a second image acquisition unit; and
a processor configured to perform a coarse focusing operation and a fine focusing operation,
wherein in the coarse focusing operation, the processor is configured to, in a first focusing range:
control a first lens of the first image acquisition unit to move from a first position in a first direction, and control a second lens of the second image acquisition unit to move from the first position in a second direction opposite to the first direction;
obtain at least one first focus value in a first focus area corresponding to the first image acquisition unit during said moving in the first direction, and obtain at least one second focus value in a second focus area corresponding to the second image acquisition unit during said moving in the second direction;
perform a first calculation on the at least one first focus value and the at least one second focus value to obtain a third focus value; and
control the first and second image acquisition units to implement focusing based on the third focus value by moving the first and second lenses to a second position corresponding to the third focus value; and

wherein in the fine focusing operation, the processor is configured to, in a second focusing range smaller than the first focusing range:
control the first lens of the first image acquisition unit to move from the second position in the first direction, and controlling the second lens of the second image acquisition unit to move from the second position in the second direction;
obtain at least one fourth focus value in the first focus area corresponding to the first image acquisition unit during said moving in the first direction, and obtaining at least one fifth focus value in the second focus area corresponding to the second image acquisition unit during said moving in the second direction;
perform a second calculation on the at least one fourth focus value and the at least one fifth focus value to obtain a sixth focus value; and
control the first and second image acquisition units to implement focusing based on the sixth focus value by moving the first and second lenses to a third position corresponding to the sixth focus value,

wherein the first position is a position, at which the first lens

Assignees

• Beijing Lenovo Software Ltd
• Lenovo Beijing Ltd

Inventors

• Zheng Qizhong

Classifications

• G03B13/36 Primary

  Autofocus systems · CPC title

• H04N23/67 Primary

  Focus control based on electronic image sensor signals · CPC title

• G02B7/04

  with mechanism for focusing or varying magnification · CPC title

• H04N5/23212 Primary

  Electricity · mapped topic

• G02B7/28

  Systems for automatic generation of focusing signals · CPC title