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 camera that includes a fixed effective focal length (EFLW) Wide lens with a Wide field of view (FOV) and a Wide sensor, the Wide camera having a Wide camera center and being operative to provide Wide image data of an object or scene;
a Tele camera that includes a fixed effective focal length (EFLT) Tele lens with a Tele FOV that is narrower than the Wide FOV and a Tele sensor, the Tele camera having a Tele camera center and being operative to provide Tele image data of the object or scene, wherein a distance D between the Wide camera center and the Tele camera center fulfills 5 mm≤D≤25 mm; and
a camera controller operatively coupled to the Wide and Tele cameras and configured to evaluate if a no-switching criterion is fulfilled or not fulfilled,
wherein if the no-switching criterion is fulfilled in a zoom-in operation between a lower zoom factor (ZF) value and a higher ZF value at a ZF higher than an up-transfer ZF, the camera controller is further configured to output a zoom video output image that includes only Wide image data, and wherein if the no-switching criterion is not fulfilled, the camera controller is further configured to output a zoom video output image that includes only transformed, digitally zoomed Tele image data.
2. The zoom digital camera of claim 1 , wherein 5 mm≤D≤20 mm.
3. The zoom digital camera of claim 1 , wherein 5 mm≤D≤15 mm.
4. The zoom digital camera of claim 1 , wherein D=10 mm.
5. The zoom digital camera of claim 1 , wherein EFL T ≥1.5×EFL W .
6. The zoom digital camera of claim 1 , wherein EFL T ≥2×EFL W .
7. The zoom digital camera of claim 1 , wherein EFL W <4 mm and EFL T >4 mm.
8. The zoom digital camera of claim 1 , wherein the no-switching criterion includes a shift between the Wide and Tele image data calculated by global registration, the shift being greater than a first threshold.
9. The zoom digital camera of claim 1 , wherein the no-switching criterion includes a disparity range calculated by global registration, the disparity range being greater than a second threshold.
10. The zoom digital camera of claim 1 , wherein the no-switching criterion includes an effective resolution of the Tele image data being lower than an effective resolution of the Wide image data.
11. The zoom digital camera of claim 1 , wherein the no-switching criterion includes a number of corresponding features in the Wide and Tele image data being smaller than a third threshold.
12. The zoom digital camera of claim 1 , wherein the no-switching criterion includes a majority of objects imaged in an overlap area of the Wide and Tele image data being calculated to be closer to the camera than a first threshold distance.
13. The zoom digital camera of claim 2 , wherein the no-switching criterion includes a majority of objects imaged in an overlap area of the Wide and Tele image data being calculated to be closer to the camera than a first threshold distance.
14. The zoom digital camera of claim 1 , wherein the no-switching criterion includes some objects imaged in an overlap area of the Wide and Tele image data being calculated to be closer than a second threshold distance while other objects imaged in the overlap area of the Wide and Tele image data being calculated to be farther than a third distance threshold.
15. The zoom digital 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, and wherein the user inputs include a zoom factor, a camera mode and a region of interest.
16. The zoom digital 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.
17. The zoom digital camera of claim 1 , wherein the zoom digital camera is included in a host device.
18. The zoom digital camera of claim 17 , wherein the host device is a smartphone.
19. The zoom digital camera of claim 17 , wherein the host device is a computer.