Image processing method and system
AssigneeBlackmagic Design Pty Ltd
InventorsCarsten Buettner, Rowan Douglas Habel
Life of this patent
Estimating the term…
Abstract
A method of processing image data that is represented in a frequency domain includes the step of applying a noise signal to the image data to yield noise-applied image data. In at least one embodiment, the image data includes one or more sets of coefficients arising from application of a discrete cosine transform, each set of coefficients comprising a DC coefficient and one or more AC coefficients. The noise signal is applied to the image data by modifying one or more of the coefficients in one or more of the sets. The modifying includes replacing one or more of the AC coefficients with random or pseudo random numbers having a distribution. Noise present in the image data may be equalized, prior to the step of applying the noise signal.
Claims21
A method of processing image data represented in a frequency domain, the method including the step of applying a noise signal to the image data to yield noise-applied image data.
A method for processing an image signal obtained from an image sensor, the image signal having a noise component with an amplitude and an image component with an amplitude, the method including:
- determining a conversion function from characteristics of the image sensor;
- and
- applying the conversion function to the image signal to yield a signal with a noise component of substantially constant amplitude independent of the amplitude of the image component.
Dependencies are inferred from the claim text.