Method of detecting phase difference between a pair of images

• US 6,108,435 A
• Filed: 12/12/1995
• Issued: 08/22/2000
• Est. Priority Date: 12/15/1994
• Status: Expired due to Fees

• Current Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Original Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Inventors: Yokoyama, Shotaro, Mori, Kenichi
• Primary Examiner(s): CHANG, JON CARLTON
• Application Number:
  US08/570,939
• Time in Patent Office: 1,715 Days
• Field of Search: 382/255, 382/278, 382/154, 382/218, 382/216, 382/106, 382/191, 250/201.8, 396/128, 356/3.14, 356/4.04
• US Class Current: 382/106
• CPC Class Codes: G06T 7/97 Determining parameters from multiple pictures depth or shape recovery from multiple images G06T7/55; stereo camera calibration G06T7/85

Abstract

A method of detecting a phase difference between a pair of images of an object which are formed on a pair of optical sensor arrays through different optical paths, with presence of flare in one of the images, is disclosed. The method includes the steps of: preparing a sensor data group representing a pattern of each image and consisting of sensor data received from each optical sensor array; correcting the sensor data group so as to eliminate a difference in the average value of the sensor data between the optical sensor arrays; preparing a plurality of combinations each having two subgroups corresponding to the pair of optical sensor arrays, each subgroup consisting of a predetermined number of a series of sensor data, which are selected from the sensor data group corrected, such that a portion of the sensor data group from which the subgroup is selected is sequentially shifted; and selecting one of the combinations having a maximum degree of correlation between the subgroups, and detecting a phase difference from positions on the optical sensor arrays which correspond to the subgroups of the selected combination.

Claims

1. A method of detecting a phase difference between a pair of images of an object, which images are formed on a pair of optical sensor arrays through different optical paths comprising the steps of:

preparing a sensor data group representing a pattern of each of said pair of images and consisting of sensor data received from each of said pair of optical sensor arrays,

correcting said sensor data group so as to eliminate a difference in an average value of the sensor data between the optical sensor arrays caused by a presence of flare in one of said pair of images;

preparing a plurality of combinations each having two subgroups corresponding to said pair of optical sensor arrays, each of said two subgroups consisting of a predetermined number of a series of sensor data, which are selected from the sensor data group which has been corrected such that a portion of the sensor data group from which the subgroup is selected is sequentially shifted; and

selecting one of the combinations having a maximum degree of correlation between the subgroups thereof, and detecting a phase difference from positions on said optical sensor arrays which correspond to the subgroups of the selected combination.

2. A method of detecting a phase difference between a pair of images of an object, which images are formed on a pair of optical sensor arrays through different optical paths, comprising the steps of:

preparing a sensor data group representing a pattern of each of said pair of images and consisting of sensor data received from each of said pair of optical sensor arrays,

preparing a plurality of combinations each having two subgroups corresponding to said pair of optical sensor arrays, each of said two subgroups consisting of a predetermined number of a series of sensor data selected from said sensor data group, such that a portion in the sensor data group from which the subgroup is selected is sequentially shifted;

correcting said subgroups of each of the combinations so as to eliminate a difference in a representative value of the sensor data between the subgroups caused by a presence of flare in one of said pair of image; and

selecting one of the combinations having a maximum degree of correlation between the subgroups thereof, and detecting a phase difference from positions on said optical sensor arrays which correspond to the subgroups of the selected combination.

3. A method as defined in claim 2, wherein said representative value of each of said subgroups is a value of one of said sensor data having a predetermined data number.

4. A method as defined in claim 2, wherein said representative value of each of said subgroups is an average value of the sensor data of said each subgroup.

5. A method of detecting a phase difference between a pair of images of an object, which images are formed on a pair of optical sensor arrays through different optical paths, comprising the steps of:

preparing a sensor data group representing a pattern of each of said pair of images and consisting of sensor data received from each of said pair of optical sensor arrays;

correcting said sensor data group by replacing each of said sensor data with a differential approximate value associated with a variable in the form of a data number of said each sensor data to correct for the presence of flare in one of said pair of images;

preparing a plurality of combinations each having two subgroups corresponding to said pair of optical sensor arrays, each of said two subgroups consisting of a predetermined number of a series of sensor data selected from the sensor data group compensated, such that a portion in the sensor data group from which the subgroup is selected is sequentially shifted; and

selecting one of the combinations having a maximum degree of correlation between the subgroups thereof, and detecting a phase difference from positions on said optical sensor arrays which correspond to the subgroups of the selected combination.

6. A method as defined in claim 5, wherein said differential approximate value for correcting said sensor data group is a difference between a first one of the sensor data, and a second one of the sensor data which is adjacent to said first one in a predetermined direction.