Digital camera using multiple image sensors to provide improved temporal sampling
A method and apparatus for capturing image data from multiple image sensors and generating an output image sequence are disclosed. The multiple image sensors capture data with one or more different characteristics, such as: staggered exposure periods, different length exposure periods, different frame rates, different spatial resolution, different lens systems, and different focal lengths. The data from multiple image sensors is processed and interleaved to generate an improved output motion sequence relative to an output motion sequence generated from an a single equivalent image sensor.
1. An electronic camera comprising: a frame rate control for selecting high and normal frame rate options; a first image sensor for generating a first sensor output wherein when the normal frame rate option is selected the first sensor output comprises a first sequence of motion image frames for providing smooth rendition at normal playback speeds; a second image sensor for generating a second sensor output wherein when the normal frame rate option is selected the second sensor output comprises a second sequence of motion image frames for providing sharper images at slow playback speeds; one or more lenses for forming images of a scene on the first and second image sensors; a timing generator for controlling the exposure period of the first image sensor and the exposure period of the second image sensor, wherein the exposure period of the first image sensor is longer than the exposure period of the second image sensor when the normal frame rate option is selected and the exposure period of the first image sensor is adjusted to match the exposure period of the second image sensor when high frame rate is selected; and a digital memory for storing the first and second sensor outputs wherein when the high frame rate option is selected, a single sequence of motion image frames is formed by interleaving the frames of the first and second sensor outputs, and wherein when the normal frame rate option is selected, two separate sequences of motion image frames are recorded substantially simultaneously in the digital memory and the two separate sequences include a first sequence which provides smooth motion rendition at normal playback speeds and a second sequence which provides sharper images at slow playback speeds.
2. The electronic camera of claim 1 , wherein when the normal frame rate option is selected, the first image sensor captures an image sequence of the scene at a frame rate of N frames per second.
3. The electronic camera of claim 1 , wherein when the normal frame rate option is selected, the second image sensor captures an image sequence of the scene at a frame rate of N frames per second and the second image sensor output provides an exposure period that is less than 1/N seconds.
4. The electronic camera of claim 1 further comprising an image processor for automatically determining whether the first sensor output and the second sensor output is included in the image sequence based on an analysis of a noise level in the scene.
5. The electronic camera of claim 1 , wherein the second sensor output is registered with the first sensor output.