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Image processing apparatus and method for controlling image processing apparatus

An image processing device and image technology, applied in the direction of image communication, color TV parts, TV system parts, etc., can solve the problem that the angle of the subject cannot be detected correctly

Active Publication Date: 2015-09-02
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for example, if there is a Figure 16C The pixel values ​​of the subject with the repeating pattern shown become as Figure 16D As shown, there are cases where the angle of the subject cannot be detected correctly based on the difference between two points

Method used

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  • Image processing apparatus and method for controlling image processing apparatus
  • Image processing apparatus and method for controlling image processing apparatus
  • Image processing apparatus and method for controlling image processing apparatus

Examples

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no. 1 example

[0029] Figure 1A is a block diagram showing an exemplary functional configuration of an imaging device (or image processing device) 100 as an exemplary image processing device according to an embodiment of the present invention.

[0030] The imaging device 100 is a device such as a digital still camera or a digital video camera that captures a subject and obtains data (image data) representing an image of the subject. The optical system 101 has a lens, a shutter, and a diaphragm, and forms an optical image of a subject on an image sensor 102 under the control of a CPU 103 . The image sensor 102 , which may be a CCD or a CMOS image sensor, performs photoelectric conversion at each pixel on a formed optical image of a subject, and converts it into an analog image signal. The CPU 103 converts an analog image signal into a digital image signal (image data), and applies it to so-called development processing and encoding processing such as white balance adjustment and color inter...

no. 2 example

[0066] The first embodiment describes a correction method in a case where a defective pixel is a pixel of a color that appears once in each repeating unit of a color filter, such as an R pixel or a B pixel in a Bayer array. The present embodiment relates to a correction method in a case where a defective pixel is a pixel present in each pixel line such as a G pixel in a Bayer array.

[0067] In the case where the R pixel or the B pixel in the Bayer array is a defective pixel, since the repeating unit is composed of two pixels, a pixel having the same color as the defective pixel does not exist in an adjacent pixel line but is located at least two pixels away from the defective pixel. pixels, so that the reference line is set on the pixel line separated by two pixels from the line of interest. However, for example, if the G pixel is such as Figure 6 For a defective pixel in part 6a of , a pixel of the same color as the defective pixel exists on an adjacent pixel line. For th...

no. 3 example

[0072] The first and second embodiments describe correction methods in the case where defective pixels are isolated. This embodiment will describe a correction method in the case where defective pixels of the same color continuously exist. Such defective pixels occur due to manufacturing tolerances or deterioration over time, and if Figure 7 As shown in part 7a of , such defective pixels also occur in the case where pixels for focus detection are arranged in an image sensor. Since the focus detection pixels generate signals for performing focus detection in the phase difference detection method, their light-receiving range is narrower than that of normal pixels, or no color filter is provided in them, so the obtained pixel values ​​are different from those of normal pixels. The pixel values ​​are different. Therefore, if Figure 7 As shown in part 7b of , a correction needs to be performed considering that these focus detection pixels will be consecutive defective pixels o...

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Abstract

A first area of an image is generated from pixels existing on a line of interest that is set so as to pass through a pixel corresponding to a correction target pixel. Second areas are generated, each second area based on the positions of pixels existing on at least one reference lines that are set so as not to pass through the correction target pixel. The value of the pixel corresponding to the correction target pixel is corrected using a value of a pixel on each of the at least one reference lines, the value being determined based on the amounts of correlation between the respective second areas and the first area. The amounts of correlation are computed while applying a larger weight to a correlation in a portion that is closer to the pixel corresponding to the correction target pixel.

Description

technical field [0001] The present invention relates to an image processing device and a control method of the image processing device, in particular to a technique for correcting defective pixels. Background technique [0002] An imaging device such as a digital camera captures an image using an image sensor such as a CMOS sensor. Generally, there are defective pixels in an image sensor because a large number of pixels are arranged in the image sensor. As a technique for correcting the value of such a defective pixel, a method is known in which a pixel value estimated from one or more values ​​of one or more non-defective pixels existing around the defective pixel is used as The pixel value at the defective pixel location. Hereinafter in this specification, obtaining a pixel value at a defective position that should be obtained if the pixel is non-defective will be referred to as defective pixel correction. [0003] For example, Japanese Patent Application Laid-Open No. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/367
CPCH04N5/367H04N25/683H04N25/704
Inventor 古谷浩平
Owner CANON KK
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