Abstract: A method for focusing by using a pre-flash is provided. The method includes the following steps. First, the image sensor captures a first image of the object, wherein the average brightness of the first image is calculated to be Y0. Next, the image sensor captures a second image of the object with the aid of a first pre-flash having a first energy, wherein the average brightness of the second image is calculated to be Y1. Afterwards, the image sensor captures a third image of the object with the aid of a second pre-flash having a second energy, wherein the average brightness of the third image is calculated to be Y2. Then, the distance D to the object is calculated according to the brightness Y0 and the difference ?Y between Y1 and Y2. Finally, the image sensor adjusts the focus according to the distance D.

Abstract: A method for focusing by using a pre-flash is provided. The method includes the following steps. First, the image sensor captures a first image of the object, wherein the average brightness of the first image is calculated to be Y0. Next, the image sensor captures a second image of the object with the aid of a first pre-flash having a first energy, wherein the average brightness of the second image is calculated to be Y1. Afterwards, the image sensor captures a third image of the object with the aid of a second pre-flash having a second energy, wherein the average brightness of the third image is calculated to be Y2. Then, the distance D to the object is calculated according to the brightness Y0 and the difference ?Y between Y1 and Y2. Finally, the image sensor adjusts the focus according to the distance D.

Abstract: The structure is designed to allow an infant to ride, sit, or lie reclined on a rocker, and to be rocked back and forth, as well as to enable the changing of the rocker's angle of inclination, or the folding of the structure for storage. In the invention, the structure comprises a frontal support frame, a rear support frame, and an arc-shaped rocking frame. On the frontal support frame there is a movable sliding sleeve to which the rear support frame is connected by a hinge. With the movable sliding sleeve, the relative positions of the frontal support frame and the rear support frame may be changed, so as to adjust the frontal support frame's angle of inclination or to draw the frontal support frame close to the rear support frame for folding to facilitate storage.

Abstract: The structure is designed to allow an infant to ride, sit, or lie reclined on a rocker, and to be rocked back and forth, as well as to enable the changing of the rocker's angle of inclination, or the folding of the structure for storage. In the invention, the structure comprises a frontal support frame, a rear support frame, and an arc-shaped rocking frame. On the frontal support frame there is a movable sliding sleeve to which the rear support frame is connected by a hinge. With the movable sliding sleeve, the relative positions of the frontal support frame and the rear support frame may be changed, so as to adjust the frontal support frame's angle of inclination or to draw the frontal support frame close to the rear support frame for folding to facilitate storage.