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Automatic exposure method for digital photographic device

A technology of digital photography and automatic exposure, applied in the direction of exposure control, optics, color TV components, etc., can solve problems such as difficult maintenance, difficult development of automatic exposure algorithms, and difficult commercialization.

Inactive Publication Date: 2006-09-27
王美娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since there are quite a lot of variables (Variable) to control exposure (aperture Iris, sensitivity value ISO, exposure time, etc.), the automatic exposure algorithm with multiple variables becomes very complicated, and if the automatic exposure algorithm is too complicated, It will make the automatic exposure algorithm difficult to develop, and cause defects that are difficult to maintain and commercialize

Method used

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  • Automatic exposure method for digital photographic device
  • Automatic exposure method for digital photographic device
  • Automatic exposure method for digital photographic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In fully automatic mode:

[0045] First of all, it is necessary to initialize the settings, so that the initial EV=3 and the previous EV=3, the exposure time (Exposure time): 1 / 16, the sensitivity value (ISO): 1600, the aperture (Iris): 2.8, and set The set three parameters of exposure time (Exposure time), light sensitivity value (ISO), and aperture (Iris) are set into the digital photography device, and the parameters just set are reflected in the sensor to capture an image And the brightness of the statistical image is 149, then by figure 2 In the prediction table, the luminance is 149 as the input, and the required correction steps (Pridect EV Step) from the target luminance are found to be 8; the new EV=the previous EV+the required correction steps from the target luminance.

[0046] EV

exposure

Time

Weighting

of

exposure

time

ISO

WEIGHTING

OF ISO

Iris

Weighting

...

Embodiment 2

[0054] When the user sets the aperture (Iris) to manual and sets it at 5.6:

[0055] EV

exposure

time

Weighting

Of

exposure

time

ISO

Weighting

of ISO

Iris

Weighting

of Iris

Weighting

summation

11

11

11

11

11

1 / 64

1 / 128

1 / 256

1 / 512

1 / 1024

5

6

11

12

15

100

200

400

800

1600

2

3

4

7

8

5.6

5.6

5.6

5.6

5.6

13

13

13

13

13

20 (minimum)

twenty two

28

32

36

[0056] EV

exposure

time

Weighting

Of

exposure

time

ISO

Weighting

of ISO

Iris

Weighting

of Iris

Weighting

summation

12

12

12

12

1 / 128

1 / 256

1 / 512

1 / 1024

6

11 ...

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Abstract

This invention relates to an auto exposure method of the digital photographic arrangement with weight value, which can change the exposure strategy at random when the user designs one factor into hand operated, and it can compute new exposure strategy by the weight value to obtain the suitable exposure quantum. Besides, in the part of forecasting function, it uses meter checking to replace the complex computer, wherein the meter is obtained by measuring the photographic device's characteristic curve.

Description

technical field [0001] The present invention relates to an automatic exposure method for a digital photographic device, in particular to a control with weighting value (Weighting), which can change the exposure strategy at will, so that the prediction of the exposure value is more accurate, the calculation amount is less, and the speed is faster. Auto-exposure method for fast digital photography devices. Background technique [0002] In the digital photography device, we use the aperture (Iris) to adjust the amount of light entering the digital photography device, so that the presented image will not be in a white state due to overexposure or in a dark state due to underexposure. In addition to adjusting the aperture, we can also change the sensitivity value (ISO) of the sensor and adjust the exposure time (Exposure time) to obtain an appropriate amount of light. [0003] Since there are quite a lot of variables (Variable) to control exposure (aperture Iris, sensitivity val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235G03B7/093G03B7/00G03B7/08H04N23/75
Inventor 王美娟
Owner 王美娟
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