Dolby Laboratories has been granted a patent for methods and systems to generate an image quality metric. The patent describes a process where a reference and test image are converted to the ITP color space, and difference images are calculated. These difference images are then convolved with low pass filters to generate a filtered image. The image quality metric is computed based on the sum of squares of the filtered images. The chroma low-pass filter is designed to maximize matching the image quality metric with subjective results. GlobalData’s report on Dolby Laboratories gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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Generating an image quality metric using color differences
A recently granted patent (Publication Number: US11776099B2) describes a method for generating an image quality metric using color differences. The method involves several steps to calculate the image quality metric.
Firstly, the method receives input images, including a reference image and a test image. These images are then converted to an ITP (Image Test Picture) reference image and an ITP test image in the ITP color space.
Next, the method generates difference images (?I, ?T, and ?P) by subtracting corresponding pixel values in the ITP reference image and the ITP test image for the I, T, and P color channels. These difference images are then filtered using specific filters.
The ?I difference image is filtered with an intensity low-pass filter to generate a filtered ?I image (F?I). The ?T and ?P difference images are filtered with a chroma low-pass filter to generate filtered ?T and ?P images (F?T and F?P).
After filtering, the method generates sums of squared values based on corresponding pixel values of the filtered ?I, ?T, and ?P images. These sums of squared values are then used to generate the image quality metric as a function of the sums of squared values.
The patent also includes additional claims that provide further details and variations of the method. For example, claim 2 states that if the input image is already in the ITP color space, the conversion step can be skipped. Claim 3 describes the specific process of converting images from the ICtCp color space to the ITP color space.
Claims 5 and 6 mention that the function of the sums of squared values can be an average function, a maximum function, a variance function, or a standard deviation function. Claim 7 provides the specific weights for the intensity low-pass filter, while claim 8 provides the weights for the chroma low-pass filter.
Overall, this patent presents a method for generating an image quality metric using color differences, providing a detailed process for converting images, filtering them, and calculating the metric. The patent also includes claims that cover variations and specific details of the method.
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