Dual aperture zoom camera with video support and switching / non-switching dynamic control
A dual-aperture zoom digital camera operable in both still and video modes. The camera includes Wide and Tele imaging sections with respective lens/sensor combinations and image signal processors and a camera controller operatively coupled to the Wide and Tele imaging sections. The Wide and Tele imaging sections provide respective image data. The controller is configured to output, in a zoom-in operation between a lower zoom factor (ZF) value and a higher ZF value, a zoom video output image that includes only Wide image data or only Tele image data, depending on whether a no-switching criterion is fulfilled or not.
1. A zoom digital camera comprising:
a Wide imaging section that includes a fixed focal length Wide lens with a Wide field of view (FOV) and a Wide sensor, the Wide imaging section operative to provide Wide image data of an object or scene;
a Tele imaging section that includes a fixed focal length Tele lens with a Tele FOV that is narrower than the Wide FOV and a Tele sensor, the Tele imaging section operative to provide Tele image data of the object or scene; and
a camera controller operatively coupled to the Wide and Tele imaging sections and configured to evaluate if a no-switching criterion is fulfilled or not fulfilled, wherein the no-switching criterion includes some objects imaged in an overlap area of the Wide and Tele images being calculated to be closer than one threshold distance while other objects imaged in the overlap area of the Wide and Tele images being calculated to be farther than another distance threshold, wherein if the no-switching criterion is not fulfilled in a zoom-in operation between a lower zoom factor (ZF) value and a higher ZF value at a zoom factor (ZF) higher than an up-transfer ZF, the camera controller is further configured to output a zoom video output image that includes only transformed, digitally zoomed Tele image data.
2. The camera of claim 1 , wherein the camera controller includes a user control module for receiving user inputs and a sensor control module for configuring each sensor to acquire the Wide and Tele image data based on the user inputs.
3. The camera of claim 2 , wherein the user inputs include a zoom factor, a camera mode and a region of interest.
4. The camera of claim 1 , wherein the Tele lens includes a ratio of total track length (TTL)/effective focal length (EFL) smaller than 1.
5. The camera of claim 1 , wherein the camera controller is further configured to combine in still mode, at a predefined range of ZF values, at least some of the Wide and Tele image data to provide a fused output image of the object or scene from a particular point of view.
6. A method for obtaining zoom images of an object or scene using a digital camera, comprising the steps of:
providing in the digital camera a Wide imaging section having a Wide lens with a Wide field of view (FOV) and a Wide sensor, a Tele imaging section having a Tele lens with a Tele FOV that is narrower than the Wide FOV and a Tele sensor, and a camera controller operatively coupled to the Wide and Tele imaging sections;
configuring the camera controller to evaluate if a no-switching criterion that includes some objects imaged in an overlap area of the Wide and Tele images being calculated to be closer than one threshold distance while other objects imaged in the overlap area of the Wide and Tele images being calculated to be farther than another distance threshold is fulfilled or not fulfilled; and
if the no-switching criterion is not fulfilled, configuring the camera controller to output at a zoom factor (ZF) higher than an up-transfer ZF a zoom video output image that includes only transformed, digitally zoomed Tele image data.
7. The method of claim 6 , wherein the no-switching criterion includes a majority of objects imaged in an overlap area of the Wide and Tele images being calculated to be closer to the camera than a first threshold distance.
8. The method of claim 6 , further comprising the step of configuring the camera controller to combine in still mode, at a predefined range of ZF values, at least some of the Wide and Tele image data to provide a fused output image of the object or scene from a particular point of view.
9. The method of claim 6 , wherein the step of configuring the camera controller to combine in still mode, at a predefined range of ZF values, at least some of the Wide and Tele image data to provide a fused output image includes configuring the camera controller to combine Wide and Tele image data only in focused areas.