Assistant focusing method by using pre flashing of flash lamp

A technology for assisting focus and flash, applied in optics, focusing devices, instruments, etc., can solve the problems of time-consuming focus adjustment, waste of power, poor focus effect, etc., and achieve the effect of improving accuracy and increasing costs.

Inactive Publication Date: 2007-02-21
COMPAL ELECTRONICS INC
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Problems solved by technology

[0005] In order to overcome the disadvantages of the existing auxiliary focus system, such as high cost, poor focus effect, time-consuming focus adjustment and waste of power, the present invention provides a method for assisting focus by using flash pre-flash to improve focus accuracy and shorten focus adjustment. time and save power without adding additional equipment

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  • Assistant focusing method by using pre flashing of flash lamp
  • Assistant focusing method by using pre flashing of flash lamp
  • Assistant focusing method by using pre flashing of flash lamp

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Embodiment Construction

[0019] In the method of the present invention utilizing flashlight preflash to assist focusing, Y 0 Preferably less than a brightness lower limit value Y L . In the method for assisting focus by using flash pre-flash in the present invention, the first energy is preferably not equal to the second energy. In the method of the present invention utilizing flashlight preflash to assist focusing, Y 0 The subject distance D corresponding to ΔY is preferably obtained by looking up a conversion table or estimating from an equation. More preferably, the above conversion table or equation is obtained from pre-collected experimental data. In the method of the present invention utilizing flashlight preflash to assist focusing, it is preferable to use Y 0 , ΔY, and reflectance R to calculate the distance D of the subject. More preferably, Y 0 , ΔY, and the relationship between the reflectance R and the distance D of the subject are obtained from pre-collected experimental data. Wher...

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Abstract

A method for utilizing preflash of flash lamp to assist focusing includes using an image sensor to pick up an image with shot object and calculating average brightness of it, using flash lamp to carry out preflash with the first energy and using said sensor to pick up image again then calculating out average brightness of it, using flash lamp to carry out preflash with the second energy and using said sensor to pick up image then calculating out average brightness of it, using D-value of three average brightness to calculate out distance D of object to be shot.

Description

technical field [0001] The present invention relates to a method for auto-focusing, and in particular to a method for using flash pre-flash to assist distance measurement to complete auto-focusing. Background technique [0002] In recent years, the research and development technology of digital cameras or digital video cameras has changed with each passing day, and the problems of traditional cameras or analog cameras that are difficult to operate and inconvenient to carry have been overcome. Common digital cameras have built-in auto focus (auto focus) mode and various manual zoom modes for users to correctly adjust the focus of the subject. In addition, it is known that in a dark environment or when the indoor light source is insufficiently illuminated, if there is no distance measurement of the auxiliary focusing system, the data obtained by the image sensor (image sensor) sensing the brightness of the external light is used to make the measurement. With autofocus, it's e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/18G03B15/03
Inventor 郭礼仁林建宇张峰祺
Owner COMPAL ELECTRONICS INC
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