Objective picture quality measurement
AssigneeSnell Limited
InventorMichael James Knee
Life of this patent
Estimating the term…
Abstract
To assess picture impairment due to the interpolation of output images from input images, for example in standards conversion, an output image detail measure is compared with an input image detail measure. One of the image detail measures is obtained by interpolation between image detail measures for at least two images.
Claims16
A method of using a processor to provide an assessment of picture impairment due to the interpolation of an output image in a sequence of output images from at least two input images in a sequence of input images, the method comprising the steps of:
- receiving at the processor said sequence of input images at an input image repetition frequency;
- forming at least one input image detail measure from each input image;
- receiving at the processor said sequence of output images at an output image repetition frequency;
- forming at least one output image detail measure from each output image;
- interpolating image detail measures using image detail measures from at least two input images or at least two output images;
- and
- comparing an image detail measure from one of the input or output image sequences with an interpolated image detail measure from the other of the input or output image sequences.
Apparatus for assessing picture impairment due to the interpolation of an output image in a sequence of output images from at least two input images in a sequence of input images, comprising:
- an input image detail evaluator for receiving said sequence of input images and forming at least one input image detail measure from each input image;
- an output image detail evaluator receiving said sequence of output images and forming at least one output image detail measure from each output image;
- an interpolator for interpolating image detail measures using image detail measures from at least two input images or at least two output images;
- and a combiner for combining an image detail measure from one of the input or output image sequences with an interpolated image detail measure from the other of the input or output image sequences to provide a measure of picture impairment.
A non-transitory computer program product containing instructions causing programmable apparatus to implement a method of providing an assessment of picture impairment due to the interpolation of an output image in a sequence of output images from at least two input images in a sequence of input images, the method comprising the steps of:
- receiving at the processor said sequence of input images;
- forming at least one input image detail measure from each input image;
- receiving at the processor said sequence of output images;
- forming at least one output image detail measure from each output image;
- interpolating image detail measures using image detail measures from at least two input images or at least two output images;
- and
- comparing an image detail measure from one of the input or output image sequences with an interpolated image detail measure from the other of the input or output image sequences.
Dependencies are inferred from the claim text.