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Imaging apparatus, method for controlling imaging apparatus and computer-readable storage medium for determining a correction value for an offset correction

a technology of offset correction and imaging apparatus, which is applied in the direction of color television details, color signal processing circuits, television systems, etc., can solve the problems of significant noise in the region, significant variation of dark current, and inability to adjust the dark current value in the specific lin

Active Publication Date: 2016-02-23
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach allows for precise dark current correction even in lines with significantly different values, reducing noise and ensuring accurate pixel value correction, while avoiding artifacts associated with previous methods.

Problems solved by technology

In the light shielded region, however, a dark current of pixels having a small pixel value is generally read, and thus this region is significantly affected by noise.
In such a case, however, pixels in a predetermined line above or below the scanning circuit may be affected by the heat of the scanning circuit, and the dark current may significantly vary.
Therefore, the dark current value of the specific line collapses, and it is not possible to correctly assume the dark current in the specific line, which may cause the situation in which appropriate dark current correction is not possible with respect to the pixel value in the specific line.

Method used

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  • Imaging apparatus, method for controlling imaging apparatus and computer-readable storage medium for determining a correction value for an offset correction
  • Imaging apparatus, method for controlling imaging apparatus and computer-readable storage medium for determining a correction value for an offset correction
  • Imaging apparatus, method for controlling imaging apparatus and computer-readable storage medium for determining a correction value for an offset correction

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Experimental program
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first embodiment

[0020]A functional configuration of an imaging apparatus according to a first embodiment is described with reference to FIG. 1. The imaging apparatus according to the first embodiment includes a solid-state image sensing device 101 that is constituted by a plurality of pixels each having a photoelectric conversion element. The solid-state image sensing device 101 includes an imaging element in which a plurality of pixels are arranged on a two-dimensional surface. This two-dimensional surface of the solid-state image sensing device 101 has a first region 102 that includes one or more lines, and a second region 103 other than the first region that includes a plurality of lines. Also, each line in the first region and the second region has pixels in a light shielded region (optical black region) that is shielded from light, and pixels in an effective region other than the light shielded region. In the present embodiment, as shown in FIG. 1, the two-dimensional surface of the solid-stat...

second embodiment

[0077]According to the first embodiment, in the first region 102, the processing for deriving a function is not performed and a representative value of each line is subtracted from the pixel value of each pixel. However, in the case where, for example, a plurality of lines belong to the first region 102, and the first region 102 has substantially the same size as that of the second region 103, an artifact may occur in the first region 102 due to the departure of the representative value caused due to the reduced number of pixels in the light shielded region. The second embodiment is such that derivation of a function is performed also in the first determination method for determining a correction value in the first region 102, and output values of the function are subtracted from pixel values of the first region 102, thereby achieving a reduction in an artifact occurred in the first region 102. Note that descriptions redundant with those of the first embodiment are omitted.

[0078]The...

third embodiment

[0084]In the imaging apparatus according to the first embodiment or the second embodiment, an artifact is likely to occur when obtaining a value that is to be subtracted and used for correcting a dark current signal with the use of the method of the first embodiment or the second embodiment, if there is a large difference among dark current values of lines. In such a case in which there is a large difference among dark current values of lines, an image having reduced artifact may be obtained rather by subtracting representative values for all the lines irrespective of in the first region 102 or the second region 103. The third embodiment describes a configuration for solving the above described problem.

[0085]Hereinafter, a functional configuration according to the third embodiment will be described with reference to FIG. 6. Note that descriptions redundant with those of the first embodiment or the second embodiment are omitted. In FIG. 6, in addition to the configurations of the fir...

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Abstract

In an imaging apparatus, a two-dimensional surface on which imaging elements are arranged has a first region that includes one or more lines, and a second region other than the first region that includes a plurality of lines, each line including a light shielded region that is shielded from light and an effective region other than the light shielded region. The imaging apparatus determines a correction value for use in offset correction for each line in the first region according to the representative value derived with respect to the first region and a first determination method, and determines correction value for use in the offset correction for each line in the second region according to the representative value derived with respect to the second region and a second determination method that is independent from the first determination method.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an imaging apparatus, method for controlling imaging apparatus and computer-readable storage medium.[0003]2. Description of the Related Art[0004]In solid-state image sensing devices such as CCD sensors or CMOS sensors, there is a dark current signal that is output even while not emitting light. The effect of this dark current signal on a captured image can be corrected by removing, from the captured image, an image captured while no light is being emitted. Such a dark current includes a component that varies depending on the time, and thus more appropriate correction is possible by obtaining the dark current signal and an image signal while light is being emitted at the same time. In order to do so, a real-time dark current correction method is used in which a part of the solid-state image sensing device is shielded from light to provide a region that is not irradiated with light (optica...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04N9/64H04N5/361H04N5/217
CPCH04N5/361H04N25/63H04N25/68
Inventor TSUKUDA, AKIRA
Owner CANON KK