Image-capturing device and method for operating image-capturing system of two cameras
An image-capturing device includes a camera module and a controller. The camera module captures an image of an object. The camera module includes a first camera and a second camera. The first camera has a first field of view (FOV) and captures an image in the first FOV, so as to produce a first image. The second camera is adjacent to the first camera and has a second FOV, in which the first FOV is wider than the second FOV. The second camera captures an image in the second FOV, so as to produce a second image. A displayer displays one of the first and second images. When a zoom ratio of the first image increases, the controller selects a display region in the first image according to an object distance, such that the display region is enlarged and then displayed on the displayer.
1. An image-capturing device comprising:
a camera module configured to capture an image of an object, wherein the image is displayed by a displayer, and the camera module comprises:
a first camera having a first focal length and a first field of view (FOV) and configured to capture an image in the first FOV, so as to produce a first image; and
a second camera spaced apart from the first camera by a gap, and the second camera having a second focal length and a second FOV, wherein the first FOV is wider than the second FOV, the second camera is configured to capture an image in the second FOV, so as to produce a second image, wherein the displayer displays one of the first and second images; and
a controller configured to select a display region in the first image according to an object distance from the object to the camera module when a zoom ratio of the first image is increased to a switch display ratio, such that the display region is enlarged to form an enlarged display region and then the enlarged display region is displayed on the displayer before the displayer displays the second image, wherein the enlarged display region is matched with the second image in appearance, a coordinate of the enlarged display region is determined by the controller according to a ratio of the gap and the object distance, a coordinate of the display region and an offset value between the first image and the second image which are at the same zoom ratio, the controller comprises a calculation unit configured to calculate the offset value according to the object distance, the first focal length, and the second focal length.
2. The image-capturing device of claim 1 , wherein the first focal length is less than the second focal length.
3. The image-capturing device of claim 1 , wherein the camera module further comprise:
an auto focus module configured to make the first camera focus on the object, wherein the first camera has a first focal length, and the controller is further configured to calculate the object distance according to the first focal length and a focus position of the first camera which is focused on the object.
4. The image-capturing device of claim 1 , wherein a point at a top-left corner of the coordinate of the enlarged display region is corresponding to a point at a top-left corner of the coordinate of the display region, so that the display region of the first image is corresponding to the second image matched with the enlarged display region in appearance.
5. An image-capturing device comprising:
a camera module configured to capture an image of an object, wherein the image is displayed by a displayer, and the camera module comprises:
a first camera having a first focal length and a first field of view (FOV) and configured to capture an image in the first FOV, so as to produce a first image; and
a second camera spaced apart from the first camera by a gap, and the second camera having a second focal length and a second FOV, wherein the first FOV is wider than the second FOV, the second camera is configured to capture an image in the second FOV, so as to produce a second image, wherein the displayer displays one of the first and second images, and the first camera and the second camera are spaced apart from each other by a gap;
a sensor configured to detect an object distance from the object to the camera module; and
a controller configured to select a display region in the first image according to the object distance when a zoom ratio of the first image is increased to a switch ratio, such that the display region is enlarged to form an enlarged display region and then the enlarged display region is displayed on the displayer before the displayer displays the second image, wherein the enlarged display region is match with the second image in appearance, a coordinate of the enlarged display region is determined by the controller according to a ratio of the gap and the object distance, a coordinate of the display region and an offset value between the first image and the second image which are at the same zoom ratio, the controller comprises a calculation unit configured to calculate the offset value according to the object distance, the first focal length, and the second focal length.
6. The image-capturing device of claim 5 , wherein a point at a top-left corner of the coordinate of the enlarged display region is corresponding to a point at a top-left corner of the coordinate of the display region, so that the display region of the first image is corresponding to the second image matched with the enlarged display region in appearance.
7. A method for operating an image-capturing system comprising:
producing a first image through capturing an object within a field of view (FOV) by a first camera having a first focal length and producing a second image through capturing the object by a second camera having a second focal length, wherein the first camera and the second camera are spaced apart from each other by a gap;
displaying the first image by a displayer, wherein a display region in the first image is selected according to an object distance of the object when a zoom ratio of the first image is increased to a switch display ratio such that the display region is enlarged to form an enlarged display region and then the enlarged display region is displayed on the displayer, wherein the enlarged display region is matched with the second image in appearance, a coordinate of the enlarged display region is determined by a controller according to a ratio of the gap and the object distance, a coordinate of the display region and an offset value between the first image and the second image which are at the same zoom ratio, the controller comprises a calculation unit configured to calculate the offset value according to the object distance, the first focal length, and the second focal length; and
switching to display the second image.
8. The method for operating the image-capturing system of claim 7 , further comprising:
detecting a distance from the object to a camera module comprising the first camera and the second camera by a sensor, so as to obtain the object distance.
9. The method for operating the image-capturing system of claim 7 , further comprising:
focusing the first camera on the object; and
calculating the object distance according to the first focal length of the first camera and a focus position of the first camera which is focused on the object.
10. The method for operating the image-capturing system of claim 7 , wherein a point at a top-left corner of the coordinate of the enlarged display region is corresponding to a point at a top-left corner of the coordinated of the display region, so that the display region of the first image is corresponding to the second image matched with the enlarged display region in appearance.