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Confirming method for automatic focusing accuracy

An autofocus and accuracy technology, applied in focusing devices, optics, instruments, etc., can solve the problems of no evaluation applicability, no confirmation of algorithm applicability, etc.

Inactive Publication Date: 2007-04-04
KINPO ELECTRONICS
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  • Summary
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Problems solved by technology

At present, there is no relevant technology to evaluate the applicability of the algorithm used by the focus evaluation value generator, so it is impossible to confirm which algorithm has better applicability, and use it as a reference for selection

Method used

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  • Confirming method for automatic focusing accuracy
  • Confirming method for automatic focusing accuracy
  • Confirming method for automatic focusing accuracy

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Embodiment Construction

[0012] Please refer to FIG. 1 , the general lens composition imaging principle is based on the distance from the subject 10 to the lens group 20 and the focal length of the lens group 20 to calculate the distance from the lens group 20 to the imaging point 30 . The design of auto-focus is to obtain image data by CCD40, the focus evaluation value generator uses algorithm to obtain focus evaluation value, and move CCD40 to the position of imaging point 30 according to the focus evaluation value to obtain clear image data.

[0013] Please refer to shown in Fig. 2, the confirmation method of autofocus accuracy of the present invention comprises the following steps:

[0014] 1. Provide a simulated image to be photographed, which generates YUV values ​​with random numbers (Y represents the ratio of black and white, and U and V are the display values ​​of colors), forming a fixed-sized object that can cover different shapes, distances, and color changes thing;

[0015] 2. Calculate ...

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Abstract

The automatic focusing accuracy confirming process includes calculating theoretic RGB value of imaging pixels in the photographed picture formed by the random value YUV value and calculating RGM in considering distance, energy divergence and intersection; calculating evaluation values of different CCD distances of form exaluation value curve, judging and counting the times of the peak value of evaluation value curve in the imaging point to obtain successful focusing times and analyzing and calculating apparent successful focusing value; transforming YVU to produce different photographed picture to obtain several apparatus focuisng values; and calculating successful focusing rate and apparent focusing average value for the compatibility contrast and analysis of the algorithm.

Description

technical field [0001] The present invention relates to a method for confirming the autofocus accuracy of a zoom lens such as a digital camera, a digital video camera, and a digital image capture device, especially a method for confirming the quality of an evaluation algorithm used in an autofocus device. Background technique [0002] The autofocus device of general digital camera, digital video camera, digital image capture device, such as the one disclosed in Taiwan Patent Publication No. 315427 "Autofocus Device and Method for Digital Electronic Camera Zoom Lens", is provided with a focus evaluation value generator A focus evaluation value of the image is calculated, and a focus motor is driven according to the focus evaluation value to perform automatic focusing of the camera. Whether the focus evaluation value generator calculated by the focus evaluation value generator is appropriate for various image data directly affects the accuracy of auto focus. At present, there...

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Application Information

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IPC IPC(8): G06F7/00G03B13/36
Inventor 林晋升刘权辉
Owner KINPO ELECTRONICS
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