Image pickup device and image pickup apparatus

a technology of image pickup and image, which is applied in the direction of picture signal generators, television systems, radio control devices, etc., can solve the problems of shortening the number of g pixels of an image and reducing the image quality

Active Publication Date: 2018-03-15
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to an image pickup device including a plurality of pixels with different filters for capturing images and detecting focus. The device has two pixel regions: a first region with image pixels and phase difference pixels, and a second region with image pixels and invalid phase difference pixels. The filters on the image pixels in the first region are arranged in a predetermined pattern, while the filters on the phase difference pixels are arranged in a pattern that alternates rows. The focus detection signal processing circuit uses only the signals from the first pixel region for focus detection, while the second pixel region is treated as an invalid region. This results in improved image quality and accurate focus detection.

Problems solved by technology

However, when a ratio in arrangement of phase difference pixels is increased as mentioned above, arranging all phase difference pixels, for example, at positions of green (G) pixels in a Bayer array causes shortage in number of G pixels for an image, resulting in decrease in image quality.
However, even where phase difference pixels are arranged at positions other than positions of G pixels in a Bayer array, providing a red (Rr) filter or a blue (Bb) filter on phase difference pixels is unfavorable from the detection sensitivity perspective mentioned above, and thus, where phase difference pixels are arranged at positions at which an Rr filter or a Bb filter is to be arranged in a Bayer array, a G filter is provided instead of an Rr filter or a Bb filter, and thus, in a phase difference pixel arrangement region including phase difference pixels, a specific filter arrangement pattern that is different from a general Bayer array is employed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0038]FIGS. 1 to 12 indicate Embodiment 1 of the present invention, and FIG. 1 is a block diagram illustrating a configuration of an image pickup apparatus. Note that, although FIG. 1 indicates an example in which the image pickup apparatus is configured, for example, as a digital camera, the image pickup apparatus is not limited to a digital camera, and may be applied widely to any of various types of apparatus having a shooting function such as a digital video camera and a telephone apparatus with a shooting function.

[0039]As illustrated in FIG. 1, the image pickup apparatus includes a lens 1, an image pickup device 2, an image processing section 3, an AF (automatic focus) evaluation value arithmetic operation section 4, a display section 5, a camera-shake detection section 7, an image stabilization section 8, an exposure control section 9, a focus control section 10, a camera operation section 11 and a camera control section 12. Here, although a memory card 6 is illustrated in FI...

example 1

[0136]An average of three pixels where pixel values of the three pixels are 389, 254 and 162 is calculated as follows.

Three pixel average=(389+254+162)×1365 / 4096=805×0.333252=268

example 2

[0137]An average of four pixels where pixel values of the four pixels are 389, 254, 162 and 92 is calculated as follows.

Four pixel average=(389+254+162+92)×1024 / 4096=897×0.25=224

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PUM

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Abstract

An image pickup device includes a first pixel region including image pixels and phase difference pixels and a second pixel region including image pixels and including no pixel configured to output a valid phase difference pixel signal, wherein a part of the plurality of phase difference pixels in the first pixel region is arranged at a regular position at which a G filter is formed in a Bayer array and another part is arranged at an irregular position at which a filter that is other than the G filter is formed, and a basic arrangement pattern of filters in the second pixel region is equal to a basic arrangement pattern of filters in the first pixel region.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims benefit of Japanese Application No. 2016-179354 filed in Japan on Sep. 14, 2016, the entire contents of which are incorporated herein by this reference.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates to an image pickup device and an image pickup apparatus that include image pixels and phase difference pixels, in which any of plural types of filters is formed at each pixel position.2. Description of the Related Art[0003]In recent years, image pickup devices in which phase difference pixels each configured to generate a phase difference pixel signal for focus detection are discretely arranged among two dimensionally-arranged image pixels have been put into practical use and commercialized.[0004]Here, each of the phase difference pixels is formed by light-shielding a part of an opening of a normal image pixel to prohibit entrance of a light ray from a particular direction and all...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N5/232H04N9/04H04N5/378H04N5/235H01L27/146
CPCH04N5/23212H04N9/045H04N5/378H04N5/23258H01L27/14645H04N5/2353H01L27/14605H01L27/14621H01L27/14623H04N5/23287H04N23/55H04N23/54H04N23/672H04N25/704H04N25/70H04N25/134H04N25/78H04N23/6812H04N23/687H04N25/531H04N23/73H04N25/75
Inventor SHIMADA, YOSHINAO
Owner OLYMPUS CORP
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