Method and system for automatically adjusting flash strength for camera

An automatic adjustment, camera technology, applied in camera, optics, focusing device, etc., can solve the problems of high power consumption in pre-flash mode and high cost of ranging module, and achieve low-cost effects

Inactive Publication Date: 2006-08-09
ASIA OPTICAL CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a method and system for automatically adjusting the flash intensity of a camera. The method and system can accurately control and adjust the flash intensity of the flash with low cost and low po

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  • Method and system for automatically adjusting flash strength for camera
  • Method and system for automatically adjusting flash strength for camera
  • Method and system for automatically adjusting flash strength for camera

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Embodiment Construction

[0024] Hereinafter, an embodiment of the present invention will be described by taking a digital camera with an auto-focus device as an example. It can be understood that a similar adjustment method can also be applied in the manual focus mode. see figure 1 A method for automatically adjusting the flash intensity of a camera provided by the present invention includes:

[0025] Step a: The focus motor operates to focus. That is, after the camera lens is aimed at the object to be photographed, the focus motor starts, and the camera lens is adjusted to focus until the object to be photographed is focused on the imaging surface to form a clear image, and then the focus motor stops rotating.

[0026] Step b: The system obtains the distance of the object to be photographed based on the step value of the motor according to the preset table. That is, use the focus sensing device to sense the step value of the focus motor during the focusing process and send it to the control device...

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Abstract

The system includes lens unit, image-sensing device, focusing mechanism, focusing and sensing device, control unit and flash unit. The method includes steps: using the focusing and sensing device senses and measures step number of motor rotation in focusing mechanism in focusing procedure; sending the step number to the control unit; the control unit compares the step number measured with the conversion table, which is input to and stored on the control unit in advance, between step number of motor rotation and distance of object to be shot so as to determine distance between the object to be shot and camera; calculating guide number of flash lamp in order to control flash lamp to emit most suitable light quality, and let photo obtain correct exposure. The invention controls and adjusts flash output accurately to reach correct exposure under condition of low cost and low power consumption.

Description

【Technical field】 [0001] The present invention relates to a method and system for automatically adjusting the flash intensity of a camera, in particular to a digital camera that calculates the distance of the object to be photographed according to the stepping position of the motor in the auto-focus program, so as to adjust the flash intensity according to the distance of the object to be photographed and the intensity of the surrounding light. A method and system for automatically adjusting and controlling the flashing intensity of a flashlight. 【Background technique】 [0002] Generally, electronic cameras are equipped with electronic flash to supplement the illumination of the subject when taking pictures at night or indoors under insufficient light conditions. The flash of the camera includes manual and automatic. In the manual flash mode, the flash emits a predetermined amount of light that has nothing to do with the distance of the subject. Because the distance of the s...

Claims

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Application Information

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IPC IPC(8): G03B13/20G03B13/00G03B15/03
Inventor 王昌锋杜维佳
Owner ASIA OPTICAL CO INC
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