IMAGE PROCESSING APPARATUS FOR DISPLAYING IMAGE ON DISPLAY UNIT AND CONTROL METHOD THEREOF

• US 20110316849A1
• Filed: 06/08/2011
• Published: 12/29/2011
• Est. Priority Date: 06/29/2010
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Inamura, Kohei, Shindo, Yuki
• Granted Patent: US 8,780,107 B2
• Time in Patent Office: Days
• US Class Current: 345/419
• CPC Class Codes: G06F 18/00 Pattern recognition
• CPC Class Codes: G06T 15/00 3D [Three Dimensional] image rendering
• CPC Class Codes: G06T 2207/10021 Stereoscopic video; Stereoscopic image sequence
• CPC Class Codes: G06T 5/40 using histogram techniques
• CPC Class Codes: G06T 5/92 based on global image properties
• CPC Class Codes: H04N 1/624 Red-eye correction control of camera based on recognised facial parts H04N23/611
• CPC Class Codes: H04N 13/133 Equalising the characteristics of different image components, e.g. their average brightness or colour balance
• CPC Class Codes: H04N 5/202 Gamma control circuits for controlling camera response irrespective of the scene brightness H04N23/82

Abstract

A frequency of each gradation in an image for the left eye histogram is compared with a frequency of each gradation in an image for the right eye histogram. An integration histogram is generated using at least a larger one of the frequency of each gradation in the image for the left eye histogram and the frequency of each gradation in the image for the right eye histogram. A gradation correction parameter is set based on the generated integration histogram. The gradations of the image for the left eye and the image for the right eye are corrected using the gradation correction parameter.

Claims

1. An image processing apparatus capable of displaying an image for a left eye and an image for a right eye which can be used for stereoscopic vision on a display unit, the image processing apparatus comprising:

a first generation unit configured to generate a histogram of the image for the left eye and a histogram of the image for the right eye;

a second generation unit configured to compare a frequency of each gradation in the histogram of the image for the left eye with a frequency of each gradation in the histogram of the image for the right eye which are generated by the first generation unit, and generate an integration histogram using at least a larger one of the frequency of each gradation in the histogram of the image for the left eye and the frequency of each gradation of the histogram of the image for the right eye;

a setting unit configured to set a gradation correction parameter based on the integration histogram; and

a correction unit configured to correct the gradations of the image for the left eye and the image for the right eye using the gradation correction parameter set by the setting unit.

2. The image processing apparatus according to claim 1, wherein, if a difference between the frequency of each gradation in the histogram of the image for the left eye and the frequency of each gradation in the histogram of the image for the right eye is equal to a predetermined value or more, the second generation unit sets the frequency of the gradation in the integration histogram as a larger one of the frequency of the gradation in the histogram of the image for the left eye and the frequency of the gradation in the histogram of the image for the right eye.

3. The image processing apparatus according to claim 2, wherein, if the difference between the frequency of each gradation in the histogram of the image for the left eye and the frequency of each gradation in the histogram of the image for the right eye is less than the predetermined value, the second generation unit sets the frequency of the gradation in the integration histogram as an average value of the frequency of the gradation in the histogram of the image for the left eye and the frequency of the gradation in the histogram of the image for the right eye.

4. The image processing apparatus according to claim 1, wherein the histogram generated by the first or second generation unit is a histogram on a luminance.

5. A method for controlling an image processing apparatus capable of displaying an image for a left eye and an image for a right eye which can be used for stereoscopic vision on a display unit, the method comprising:

generating a histogram of the image for the left eye and a histogram of the image for the right eye;

comparing a frequency of each gradation in the generated histogram of the image for the left eye with a frequency of each gradation in the generated histogram of the image for the right eye and generating an integration histogram using at least a larger one of the frequency of each gradation in the histogram of the image for the left eye and the frequency of each gradation of the histogram of the image for the right eye;

setting a gradation correction parameter based on the integration histogram; and

correcting the gradations of the image for the left eye and the image for the right eye using the set gradation correction parameter.