Method and device to capture images by emulating a mechanical shutter
AssigneeThomson Licensing
InventorsPascal Bourdon, Jonathan Kervec, Didlier Doyen
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Abstract
To capture an image, the image sensing period of this image is subdivided into a plurality of successive illumination periods, and the value which is assigned to each pixel to capture the image is the sum of the integrals of intensity of illumination of this pixel over each of said successive illumination periods. According to the invention, this sum is weighted by an apodization function in order to emulate a mechanical shutter. Temporal aliasing issues and temporal ringing artifacts of digital imaging are prevented or at least limited.
Claims8
Device for video capturing successive images of a scene comprising moving objects, said device comprising at least one image sensing device having an active surface made of an array of pixels and able to sense each of these pixels by providing a readout signal representative of the combination of intensity and duration of illumination of said pixel, an optical system able to form successively said images of said scene on said active surface such as to illuminate said active surface, and driving means able to drive said image sensing device and to assign a value to each pixel of each formed successive image for said video capture,
- wherein, an image sensing period of illumination of said active surface being predetermined for said video capture, said driving means are adapted:
- to subdivide said image sensing period into a plurality of successive illumination periods,
- for each of said images, to assign to each pixel the sum of the readout signals provided by this pixel for each of said successive illumination periods, said sum being weighted by an apodization function.
Method to capture successive images of a scene comprising moving objects, wherein each image is captured during an image sensing period, comprising the followings steps:
- subdividing said image sensing period into a plurality of successive illumination periods;
- for each of said successive images, assigning to each pixel of said image a value proportional or equal to the sum of the integrals of intensity of illumination of this pixel over each of said successive illumination periods, wherein said sum is weighted by an apodization function.
Dependencies are inferred from the claim text.