Back to results
US 12,309,427 B2Granted
Image compression
AssigneeContrast, Inc.
InventorsWillie C. Kiser, Michael D. Tocci, Nora Tocci
Life of this patent
Estimating the term…
Abstract
The invention provides methods that improve image compression and/or quality within the JPEG process by using a low-pass filter to remove high frequency components from image data, which removes blocking artifacts. Preferred embodiments apply the low-pass filter to the Chroma components after decompression prior to conversion into RGB color space.
Claims12
A method for compressing image data, the method comprising:
- receiving, from an image sensor of a camera, image data into a processor of the camera;
- transforming the image data into Luma data and Chroma data in a YCbCr color space;
- performing a discrete cosine transform (DCT) on the Luma data and the Chroma data to return Luma coefficients and Chroma coefficients;
- quantizing the Luma coefficients and the Chroma coefficients and applying a low-pass filter to the Chroma coefficients, but not to the Luma coefficients, to return quantized, filtered coefficients;
- and
- compressing the quantized, filtered coefficients to produce compressed image data within the camera.
3 more elements
Dependencies are inferred from the claim text.