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Image pickup apparatus and method of controlling the same

A technology for moving images and still images, applied in image communication, parts of color TVs, parts of TV systems, etc., can solve problems such as errors and deviation exposure, and achieve the effect of suppressing changes in exposure

Inactive Publication Date: 2008-11-19
HITACHT MAXELL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] ③In the above-mentioned well-known example, the aperture device used as the shutter was invented on the premise of quickly and accurately moving to the set value, but in fact, in order to realize the aperture device, as mentioned above, it must be considered to use New servo loop for maintaining exposure accuracy, etc.
[0017] However, it becomes an overexposure state in fields b3 and b4, and during this period, processing such as masking must be performed on the output signal
[0018] In addition, in the field b5, it is assumed that the linearity of the aperture and the repeatability of the aperture are sufficiently ensured for locking. However, in practice, each locking will deviate and cause exposure errors.

Method used

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  • Image pickup apparatus and method of controlling the same
  • Image pickup apparatus and method of controlling the same
  • Image pickup apparatus and method of controlling the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0070] Fig. 2 is a block diagram of an imaging device according to a first embodiment of the present invention. In the figure, 101 is a lens, 102 is a mechanical shutter, 103 is an imaging device, 104 is an amplifier, 105 is an A / D converter, 106 is an image signal processing circuit, 107 is a camera control circuit, 108 is a mechanical shutter control circuit, 109 Denotes an imaging device driving circuit, and 110 denotes a shutter button. A specific example of the imaging device 103 is shown in image 3 . exist image 3 Among them, 121 is a photodiode, 122 is a vertical CCD, 123 is a horizontal CCD, gr, mg, cy, ye are color filters arranged on each surface of the photodiode 121, gr is a green color filter, mg is a product Red color filter, cy is cyan color filter, ye is yellow color filter. Photodiodes provided with these color filters are often referred to as pixels. In addition, in image 3 Among them, V1: vertical transfer pulse 1; V2: vertical transfer pulse 2; V3:...

no. 2 Embodiment

[0099] Next, a second embodiment of the present invention will be described with reference to the drawings.

[0100] Since the configuration of the imaging device according to the second embodiment of the present invention is the same as that of the above-mentioned first embodiment, it will be described using FIG. 2 . In addition, description of the same parts as those in the first embodiment will be omitted. As shown in the above-mentioned embodiments, when a still image is captured, more light is incident on the imaging device 103 and more charge is accumulated, which is advantageous for improving the S / N ratio. Next, the exposure control when capturing a still image will be described assuming that the amount of charge accumulated in the imaging device 103 is 1.5 times that during capturing a moving image.

[0101] Figure 9 It is a timing chart of the exposure amount of the imaging device 103 and the charge transfer from the photodiode 121 to the vertical CCD 122 correspo...

no. 3 Embodiment

[0106] Next, a third embodiment of the present invention will be described with reference to the drawings.

[0107] The configuration of the imaging device according to the third embodiment of the present invention is the same as that of the above-mentioned first and second embodiments, so it will be described using FIG. 2 . In addition, descriptions of the same parts as those in the first and second embodiments are omitted. In this embodiment as well, the exposure control during still image shooting is described by assuming that the amount of charge accumulated in the imaging device 103 is 1.5 times that during moving image shooting.

[0108] Figure 10 It is a timing chart of the exposure amount of the imaging device 103 and the charge transfer from the photodiode 121 to the vertical CCD 122 corresponding to the aperture value of the mechanical shutter 102 in this embodiment. In this embodiment, the difference from the above-mentioned second embodiment is that the illumina...

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PUM

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Abstract

An amount of exposure in a still imaging mode is increased as compared with the amount of exposure for mode is increased as compared with the amount of exposure for one field in the motion picture imaging mode, preferably twice as large as the latter. In the still picture mode, electric charges are swept out from a CCD by an exposure control simultaneously with closing of a diaphragm for adjusting the amount of exposure. Upon occurrence of error in the closing operation of the diaphragm, the amount of exposure in the still picture mode is set to a design value. On the basis of difference between the design value and an actually measured value of the amount of exposure, gain for video signal is corrected. In the motion picture mode, the diaphragm and the electronic shutter speed is adjusted for preventing flicker from making appearance under illumination of a fluorescent lamp in indoor photographing. The adjusted speed can be +E,fra 1 / 100 sec.

Description

[0001] This case is a divisional application of the parent case (application number: 200410005443.6). technical field [0002] The present invention relates to an imaging device and a control method thereof. Background technique [0003] With the digitalization of signal processing, cameras have developed various functions. On the other hand, since digital image signals can be easily output, it is attracting attention as an image input device such as a computer. The image processed by a computer etc. is usually a still image. In order to obtain an image signal of a still image, a video camera-integrated VTR (Video Tape Recorder) for civilian use is now used to output any one field or even The image signal of one frame is recorded in a memory or the like. An image signal recorded in a memory or the like is input to a computer as a still image. Japanese Unexamined Patent Publication No. 2-288679 describes a technique for outputting a still image with an appropriate exposure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235H04N5/238H04N5/335H04N5/341H04N5/347H04N5/351H04N5/353H04N5/3728H04N5/378
Inventor 井浦则行仓重知行山本直树今出宅哉嘉见博章户高义弘
Owner HITACHT MAXELL LTD