Automatic focusing method for digital camera

An automatic focus, digital camera technology, applied in cameras, focusing devices, televisions, etc., can solve the problems of shortening focusing time, restricting the scope of application of consumer digital cameras and mobile phone cameras, and continuous shooting functions, etc. The effect of shortening search time and saving search time

Inactive Publication Date: 2009-08-19
TIANJIN SAMSUNG OPTO ELECTRONICS
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AI Technical Summary

Problems solved by technology

However, for some autofocus algorithms that exist today, the focus time of the 5x or more optical zoom lens barrel continues to shorten and the imaging becomes clearer due to the increase in the number of pixels. The scope of application of taking pic

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  • Automatic focusing method for digital camera
  • Automatic focusing method for digital camera
  • Automatic focusing method for digital camera

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Embodiment approach

[0114] The following describes the flow of the autofocus program algorithm for specific parts:

[0115]The main program flow chart of the autofocus method of the present invention is as attached figure 2 Shown:

[0116] Step 1: Define the lens hardware connection end to determine the flow of control signals;

[0117] Step 2: Camera position initialization;

[0118] Step 3: Perform a global scan with a large step size; enter the global search process, calculate the evaluation function, and calculate the threshold;

[0119] Step 4: Obtain the optimal evaluation function value in the first focus window;

[0120] Step 5: Convert the embedded focus window to scan in small steps; enter repeated scanning, and calculate the evaluation function;

[0121] Step 6: Whether the maximum value of the evaluation function is reached, if yes, proceed to step 7, if not, return to step 5 and repeat;

[0122] Step 7: Determine the optimal position and end the search.

[0123] as attached ...

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Abstract

The invention relates to an automatic focusing method of a digital camera; the main program of the automatic focusing method thereof comprises the following steps: step one: the connection end of a lens hardware is defined for determining the circulation of control signals; step two: the position of the lens is initialized; step three: large-step overall scanning is carried out; step four: the optimal evaluation function value of a first focusing window is obtained; step five: the embedded focusing window is converted by a short-step scanning; step six: whether the position for the largest value of the evaluation function is reached is judged; if the position for the largest value of the evaluation function is reached, step seven is then carried out; if not, the step five is carried out again; and step seven: the optimal position is determined and the search is ended. By using the automatic focusing algorithm which is designed by the method of the invention, precise focusing can be realized by quickly switching the focusing windows, moreover, as the design for a golden section point nested focusing window greatly accelerates the search speed of the optimal focusing position and the imaging aesthetics need is also greatly met, the rapid focusing aesthetic imaging performance of consumption-typed cameras is really achieved.

Description

technical field [0001] The invention relates to a digital camera automatic focus control system, in particular to an automatic focus method for a digital camera. Background technique [0002] At present, as digital cameras and digital video cameras gradually enter people's daily life, such products can be seen everywhere in the market, and gradually become one of the hot spots of sales. However, whether it is a digital camera, a digital video camera, or a camera phone with an auto-focus function, there are very few designs from mainland China, and the market is almost always dominated by foreign products. [0003] As a key technology of the imaging system, autofocus technology was first applied to the camera system in the 1970s. Most of the traditional focusing techniques are based on the principle of distance measurement, such as ultrasonic distance measurement, reflected energy method and some methods based on triangulation. The distance principle method; With the develop...

Claims

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Application Information

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IPC IPC(8): G03B13/36G02B7/28H04N5/232
Inventor 王海峰郑龙周曹再铉巩国樑高岩王钧剑
Owner TIANJIN SAMSUNG OPTO ELECTRONICS
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