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3 results about "Pixel aspect ratio" patented technology
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Pixel aspect ratio (often abbreviated PAR) is a mathematical ratio that describes how the width of a pixel in a digital image compares to the height of that pixel. Most digital imaging systems display an image as a grid of tiny, square pixels. However, some imaging systems, especially those that must be compatible with standard-definition television motion pictures, display an image as a grid of rectangular pixels, in which the pixel width and height are different. Pixel aspect ratio describes this difference.
Management of aspect ratio in hierarchical coding schemes
A method of signalling a signal adjustment when encoding an input signal using a hierarchical coding scheme to manage a display aspect ratio. The hierarchical coding scheme comprises encoding a downsampled version of the input signal using a first encoding method to produce a first encoded signal. When the downsampling operation of the hierarchical coding scheme is a non-square downsampling operation, the method signals an adjustment to cause a pixel aspect ratio of the first encoded signal to be adjusted by a scaling factor, wherein the scaling factor is determined from the non-square downsampling operation. Additionally, correction is applied in an enhancement level of the hierarchical coding scheme to ensure that the signalled change of pixel aspect ratio does not lead to unintended consequences in the enhanced reproduction at a decoder-side.
Owner:V NOVA INT LTD
Spectrometer and Raman microscope comprising such spectrometer
The invention relates to a spectrometer (10) comprising an aperture (13) configured to receive a source light beam, a first optical system configured to receive the source light beam and form a collimated light beam directed to a diffraction grating, the diffraction grating configured to receive the collimated light beam and form a diffracted light beam, a second optical system configured to form an image of the diffracted light beam on an image sensor. According to the invention, the image sensor is a CMOS sensor comprising pixels (34) arranged in N rows, the pixel rows being oriented in a direction inclined by an angle alpha relative to a spectral diffraction direction of an image of the diffracted beam, where alpha is less than 10 degrees, N is at least 3, and each pixel having a height and a width defining a pixel aspect ratio greater than 2.
Owner:HORIBA FRANCE SAS
Optical spectrometers and Raman microscopes including such spectrometers
The present invention relates to an optical spectrometer (10) comprising: an aperture (13) configured to receive a light source beam; a first optical system configured to receive the light source beam and form a collimated light beam directed toward a diffraction grating; a diffraction grating configured to receive the collimated light beam and form a diffracted light beam; and a second optical system configured to form an image of the diffracted light beam on an image sensor. According to the present invention, the image sensor is a CMOS sensor comprising pixels (34) arranged in N rows oriented in a direction tilted by an angle alpha with respect to the spectral diffraction direction of the image of the diffracted light beam, where alpha is less than 10 degrees, N is at least 3, and each pixel has a height and width that define a pixel aspect ratio greater than 2.
Owner:HORIBA FRANCE SAS