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    • 3. 发明授权
    • Focus method and photographic device using the method
    • 聚焦方法和摄影装置采用该方法
    • US08233787B2
    • 2012-07-31
    • US12963760
    • 2010-12-09
    • Chih-Pin YenChia-Lun TsaiLi-Wen Kuo
    • Chih-Pin YenChia-Lun TsaiLi-Wen Kuo
    • G03B17/00G03B3/00G03B13/00H04N5/262H04N2/232G02B7/04
    • G03B3/10G03B13/34G03B13/36
    • A photographic device using a focus method includes a zoom lens, an image analyzing module, a focus distance providing module and a processing module. The zoom lens is used for capturing image information of a plurality of positions. The image analyzing module is used for analyzing contrast values of the image information of the plurality of positions. The focus distance providing module is used for providing a non-equivalent and a constant focus distance interval for capturing the image information of the plurality of positions. The processing module is electrically connected with the zoom lens, the image analyzing module, and the focus distance providing module. Whereby, the photographic device acquires the image information of the plurality of positions by the non-equivalent focus distance interval, acquires a coarse focus position, and acquires an accurate focus position by the constant focus distance according to the coarse focus position.
    • 使用聚焦方法的摄影装置包括变焦镜头,图像分析模块,对焦距离提供模块和处理模块。 变焦镜头用于拍摄多个位置的图像信息。 图像分析模块用于分析多个位置的图像信息的对比度值。 聚焦距离提供模块用于提供用于捕获多个位置的图像信息的非等效和恒定焦距距离间隔。 处理模块与变焦镜头,图像分析模块和对焦距离提供模块电连接。 由此,拍摄装置通过非等效对焦距离间隔获取多个位置的图像信息,获取粗略聚焦位置,并且通过根据粗焦点位置的恒定焦距来获取准确的聚焦位置。
    • 9. 发明授权
    • Fast focusing method for digital camera
    • 数码相机快速聚焦方法
    • US08259217B2
    • 2012-09-04
    • US12784762
    • 2010-05-21
    • Chan-Min ChouChia-Lun TsaiChih-Pin Yen
    • Chan-Min ChouChia-Lun TsaiChih-Pin Yen
    • H04N5/232
    • G03B13/36G06K9/00228G06K9/3233H04N5/23212H04N5/23219
    • A fast focusing method for a digital camera is applied in an auto focusing stage for judging whether the digital camera needs to be refocused. The fast focusing method includes recording a system time after a previous focusing (defined as a first time); capturing a system time before a current focusing (defined as a second time); performing a fuzziness detection procedure to acquire a focus value when a difference obtained by subtracting the first time from the second time is greater than a focusing time threshold; setting a focusing focal length range covering a reference focal length when the focus value is between a lower limit focusing threshold and an upper limit focusing threshold; capturing images at different focusing focal lengths respectively in the focusing focal length range; calculating a contrast value of each image; calculating a target focal length from the contrast values through a quadratic curve approximation method.
    • 用于数码相机的快速聚焦方法被应用于自动对焦阶段,用于判断数码相机是否需要重新聚焦。 快速聚焦方法包括在先前聚焦(定义为第一次)之后记录系统时间; 在当前对焦之前捕获系统时间(定义为第二次); 当通过从第二时间减去第一次获得的差大于聚焦时间阈值时,执行模糊检测过程以获取聚焦值; 当聚焦值在下限聚焦阈值和上限聚焦阈值之间时,设置覆盖参考焦距的聚焦焦距范围; 在聚焦焦距范围内分别拍摄不同聚焦焦距的图像; 计算每个图像的对比度值; 通过二次曲线近似法从对比度值计算目标焦距。