METHOD OF CONTROLLING AN IMAGE CAPTURING SYSTEM, IMAGE CAPTURING SYSTEM AND DIGITAL CAMERA
First Claim
1. A method of controlling an image capturing system to capture underexposed image frames used to provide a final combined image comprising an interface comprising a microprocessor 13, an output device 16 and an input device 17 for receiving an external trigger to capture an image, and an image capturing device provided with a photosensitive area and an array of pixel cells, each pixel cell including a device for generating a signal indicative of the intensity of light falling on an associated part of the photosensitive area, which image capturing device is further provided with readout circuitry consisting of a selection circuit and a readout circuit for generating an array of pixel values to capture an underexposed image frame at a set spatial resolution, such that each pixel value represents an integral of the signal or signals generated in at least one of the pixel cells in an associated one of a number of cluster areas over an exposure time interval, the number of cluster areas being determined by the set spatial resolution, the cluster areas together covering a region of the photosensitive area corresponding to a region in the image, which method comprises receiving an external trigger to capture an image, and, in response to the external trigger, directing the image capturing device to capture at least two underexposed image frames wherein the at least two underexposed image frames are captured by generating respective arrays of pixel values representing integrals over respective consecutive exposure time intervals, each exposure time interval being less than a desired exposure time of a final combined image, wherein the spatial resolutions of at least two of the captured image frames are set to different values.
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Abstract
A method of controlling an image capturing system comprising an interface for receiving an external trigger to capture an image, and an image capturing device provided with a photosensitive area and an array of pixel cells, each pixel cell including a device for generating a signal indicative of the intensity of light falling on an associated part of the photosensitive area, which image capturing device is further provided with readout circuitry for generating an array of pixel values to capture an image frame at a set spatial resolution, such that each pixel value represents an integral of the signal or signals generated in at least one of the pixel cells in an associated one of a number of areas over an exposure time interval, the number of areas being determined by the set spatial resolution, the areas together covering a region of the photosensitive area corresponding to a region in the image, comprises receiving an external trigger to capture an image, and, in response to the external trigger, directing the image capturing device to capture at least two image frames by generating respective arrays of pixel values representing integrals over respective consecutive exposure time intervals. The spatial resolutions of at least two of the captured image frames are set to different values.
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Citations
9 Claims
- 1. A method of controlling an image capturing system to capture underexposed image frames used to provide a final combined image comprising an interface comprising a microprocessor 13, an output device 16 and an input device 17 for receiving an external trigger to capture an image, and an image capturing device provided with a photosensitive area and an array of pixel cells, each pixel cell including a device for generating a signal indicative of the intensity of light falling on an associated part of the photosensitive area, which image capturing device is further provided with readout circuitry consisting of a selection circuit and a readout circuit for generating an array of pixel values to capture an underexposed image frame at a set spatial resolution, such that each pixel value represents an integral of the signal or signals generated in at least one of the pixel cells in an associated one of a number of cluster areas over an exposure time interval, the number of cluster areas being determined by the set spatial resolution, the cluster areas together covering a region of the photosensitive area corresponding to a region in the image, which method comprises receiving an external trigger to capture an image, and, in response to the external trigger, directing the image capturing device to capture at least two underexposed image frames wherein the at least two underexposed image frames are captured by generating respective arrays of pixel values representing integrals over respective consecutive exposure time intervals, each exposure time interval being less than a desired exposure time of a final combined image, wherein the spatial resolutions of at least two of the captured image frames are set to different values.
- 7. An image capturing system configured to capture underexposed image frames used to provide a final combined image comprising an interface comprising a microprocessor 13, an output device 16 and an input device 17 for receiving an external trigger to capture an underexposed image frame, an image capturing device provided with a photosensitive area and an array of pixel cells, each pixel cell including a device for generating a signal indicative of the intensity of light falling on an associated part of the photosensitive area, which image capturing device is further provided with readout circuitry comprising a selection circuit and a readout circuit for generating an array of pixel values to capture an underexposed image frame at a set spatial resolution, such that each pixel value represents an integral of the signal or signals generated in at least one of the pixel cells in an associated one of a number of cluster areas over an exposure time interval, the number of cluster areas being determined by the set spatial resolution, the cluster areas together covering a region of the photosensitive area corresponding to a region in the image, which image capturing system comprises a control system comprising a digital signal processor (DSP) and a microprocessor for controlling the operation of the image capturing device and for processing commands received through the interface, wherein the control system is configured to, in response to the external trigger, direct the image capturing device to capture at least two underexposed image frames wherein the at least two image frames are captured by generating respective arrays of pixel values representing integrals over respective consecutive exposure time intervals, each exposure time interval being less than a desired exposure time of a final combined image, wherein the control system is further configured to set the spatial resolutions of at least two of the captured image frames to different values.
Specification