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Automatic focusing system of digital camera for non-uniform sampling window planning based on golden section

A non-uniform sampling and golden section technology, applied to cameras, focusing devices, installations, etc., can solve problems such as complex image division and real-time impact, and achieve the effects of reducing computational complexity, ensuring accuracy, and reducing the amount of calculation

Inactive Publication Date: 2011-08-31
SHANGHAI INFOTM MICROELECTRONICS
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AI Technical Summary

Problems solved by technology

The commonly used non-uniform sampling method is to divide the image into sectors or circles, and each sampling area outputs a preprocessed pixel point, such as a median point. These non-uniform sampling methods divide the image more complicated and involve Image preprocessing to the sampling area, so it has a great impact on real-time performance

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  • Automatic focusing system of digital camera for non-uniform sampling window planning based on golden section
  • Automatic focusing system of digital camera for non-uniform sampling window planning based on golden section
  • Automatic focusing system of digital camera for non-uniform sampling window planning based on golden section

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] like figure 1 Shown is the flow chart of the steps of the digital camera auto-focus system. When the digital camera is in the pre-shooting mode, the golden section of the image has been performed inside the system, and the G component data of each golden section point is sampled non-uniformly. The G component data results are calculated by the focus evaluation function. If the calculation result is the optimal value, the focus is successful. Otherwise, the lens drive motor is moved, and the focus evaluation function is iteratively calculated again until the best focus point is found.

[0025] like figure 2 Shown is the golden section diagram of the digital camera auto-focus system, each point represents a sampling area, point O is the central area, the sampling rate is the highest, accounting for 5% of the entire image size, A i (i=1, 2, 3, 4) is the first go...

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Abstract

The invention discloses an automatic focusing system of a digital camera for non-uniform sampling window planning based on golden section. A method comprises the following steps of: carrying out the golden section on a shooting scene for many times in automatic focus window planning; carrying out non-uniform sampling on an area where golden section points are located; and endowing the non-uniform sampling area with different weight values by using an energy gradient function based on a green component as a focusing evaluation function. Therefore, complexity of calculation is reduced on the premise of guaranteeing the focusing accuracy of an imaging body and a background area, and a real-time requirement of the automatic focusing system of the digital camera is met.

Description

Technical field: [0001] The present invention relates to an automatic focusing system of a digital camera, and more specifically, relates to a non-uniform sampling window planning method based on the golden section and an automatic focusing system based on the G (green) component when the digital camera is used for automatic focusing. Focus on evaluation functions. Background technique: [0002] Auto-focus technology is applied to camera systems. The focus system used by traditional cameras is often realized by the principle of distance measurement. With the development of information technology, auto-focus technology based on intelligent image analysis and processing is widely used in digital cameras or video cameras. [0003] The traditional digital camera auto-focus system has a low level of intelligence, which is mainly reflected in the selection of the focus window. It cannot adapt to various shooting scenes, especially those with complex subjects and backgrounds, resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/36G02B7/34
Inventor 杨平中
Owner SHANGHAI INFOTM MICROELECTRONICS
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