Telephoto lens based on automatic ranging and method and device for realizing automatic focusing
A telephoto lens and auto-focus technology, applied in the field of photography focus, can solve the problems of long time-consuming and cumbersome operation during focusing
Active Publication Date: 2021-11-02
中山市远尚光电科技有限公司
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The biggest disadvantage of this operation is that the blurred image takes up most of the focusing time, and the focusing period takes a long time, the operation is cumbersome, and it cannot be accurately aligned in one step.
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[0044] The present application will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.
[0045] Such as Figures 1 to 4 As shown, a telephoto lens based on automatic ranging realizes an autofocus method, and the telephoto lens based on automatic ranging realizes an autofocus method, comprising the following steps:
[0046] In step S101 , the theoretical value of the distance value and the in-focus position of the motor is obtained through the test object distance experiment.
[0047] In this step, the laser ranging module is used to measure the calibration distance between the laser ranging module and the calibration environment; the lens uses the motor to focus on the calibration environment with reference to the calibration distance until the image is clearly focused and a focus is obtained. distance.
[0048] Further, the lens reads the change value of the calibrated distance in real time through serial port co...
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The present application discloses a method for realizing automatic focusing of a telephoto lens based on automatic ranging. The method for realizing automatic focusing of a telephoto lens based on automatic ranging includes the following steps: Obtaining a distance value and a clear focus position of a motor through a distance test of an object The theoretical value; form a matrix data list and generate the target code; power-on self-test, multiple sampling, calculate the offset value; according to the change of the object distance, look up the table in the theoretical value information program; based on the focus position Compare the actual value with the theoretical value to determine whether the offset value is positive or negative. The present application also discloses an automatic focusing device based on an automatic ranging telephoto lens, including: a telephoto lens group, a laser ranging module, a motor, a motor control module, a pre-storage processing module, a main control module, and a serial communication module. The present application also discloses a telephoto lens, which refers to the above-mentioned device. The focusing operation is simplified and accurate focusing is achieved.
Description
technical field [0001] The present application relates to the technical field of photographic focusing, in particular to a telephoto lens based on automatic ranging and a method and device for realizing automatic focusing. Background technique [0002] Most of the existing telephoto lens automatic or manual focusing methods are to control the lens motor by obtaining image information to perform global or regional search to the maximum clear point position. Each search process requires a large number of algorithm judgments. First, perform a general fuzzy search to the front and rear positions of the clear point of the image, and then control the motor back and forth to perform a fine search to achieve the maximum clear point. The biggest disadvantage of this operation is that the blurred image takes up most of the focusing time, and the focusing period takes a long time, the operation is cumbersome, and it cannot be accurately aligned in one step. Contents of the invention ...
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IPC IPC(8): H04N5/232G03B13/36G03B13/20G02B7/28
CPCG02B7/28G03B13/20G03B13/36
Inventor 郑有杰龙伟华王岩王化东魏剑虹
Owner 中山市远尚光电科技有限公司