Abstract: A redeye image detection method for detecting at least one redeye image in an input image includes: deriving an edge detection result by performing an edge detection process to detect an edge characteristic of the input image; deriving a red pixel detection result by performing a red pixel detection process to detect red pixels in the input image, and utilizing a determining circuit to derive a preliminary detection result according to the edge detection result and the red pixel detection result, and derive the redeye image according to the preliminary detection result.

Abstract: An image processing method for deriving text characteristic images from an input image includes: performing a plurality of edge detecting processes upon the input image to generate a plurality of edge images, respectively, and deriving a first text characteristic image according to the edge images. The image detecting processes include: performing a first edge detecting process upon the input image to derive a first edge image according to a first upper threshold and a first lower threshold, and performing a second edge detecting process upon the input image to derive a second edge image according to a second upper threshold and a second lower threshold.

Abstract: A method for generating a non-graphical digital image from an original digital image includes the following steps: performing edge detection to generate a third digital image, performing screen dot detection to detect the photo regions in the original digital image, detecting color regions in the original digital image, removing the photo regions and the color regions from the third digital image to generate the non-graphical digital image.

Abstract: A redeye image detection method for detecting at least one redeye image in an input image includes: deriving an edge detection result by performing an edge detection process to detect an edge characteristic of the input image; deriving a red pixel detection result by performing a red pixel detection process to detect red pixels in the input image, and utilizing a determining circuit to derive a preliminary detection result according to the edge detection result and the red pixel detection result, and derive the redeye image according to the preliminary detection result.

Abstract: A circuit for calibrating a focus position of an optical module includes a calibration signal generating unit and a focus position adjusting unit. The calibration signal generating unit is utilized for generating a calibration signal according to a first focus signal and a second focus signal at the same time, where the first focus signal and second focus signal correspond to a first focus position and a second focus position, respectively, and the first focus position is different from the second focus position. The focus position adjusting unit is coupled to the calibration signal generating unit and is utilized for adjusting the focus position of the optical module to a specific focus position according to the calibration signal.

Abstract: An image processing method for deriving text characteristic images from an input image includes: performing a plurality of edge detecting processes upon the input image to generate a plurality of edge images, respectively, and deriving a first text characteristic image according to the edge images. The image detecting processes include: performing a first edge detecting process upon the input image to derive a first edge image according to a first upper threshold and a first lower threshold, and performing a second edge detecting process upon the input image to derive a second edge image according to a second upper threshold and a second lower threshold.

Abstract: A circuit for calibrating a focus position of an optical module includes a calibration signal generating unit and a focus position adjusting unit. The calibration signal generating unit is utilized for generating a calibration signal according to a first focus signal and a second focus signal at the same time, where the first focus signal and second focus signal correspond to a first focus position and a second focus position, respectively, and the first focus position is different from the second focus position. The focus position adjusting unit is coupled to the calibration signal generating unit and is utilized for adjusting the focus position of the optical module to a specific focus position according to the calibration signal.

Abstract: A method for generating a non-graphical digital image from an original digital image includes the following steps: performing edge detection to generate a third digital image, performing screen dot detection to detect the photo regions in the original digital image, detecting color regions in the original digital image, removing the photo regions and the color regions from the third digital image to generate the non-graphical digital image.