Method of compressing image data
AssigneeArnold & Richter Cine Technik GmbH & Co. Betriebs KG
InventorsMichael CIESLINSKI, Stefano ANDRIANI
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Abstract
In a method of compressing image data which include a plurality of pixel values which are associated with a respective pixel, the pixel values are coded for at least some pixels in accordance with the following steps: determining an estimated pixel value of the respective pixel in dependence on the pixel value of at least one predetermined other pixel while using an estimation rule; and forming a difference value of the respective pixel which corresponds to a predefined relation between the pixel value and the estimated pixel value of the respective pixel and quantization of the difference value in accordance with a difference value quantization rule. The quantized difference values of the pixels are compressed in accordance with a compression rule.
Claims52
A method of compressing image data which include a plurality of pixel values which are associated with a respective pixel, wherein the pixel values for at least some pixels are coded in accordance with the following steps:
- (b) determining an estimated pixel value of the respective pixel in dependence on the pixel value of at least one predetermined other pixel while using at least one estimation rule;
- and
- (d) forming a difference value of the respective pixel which corresponds to a predefined relation between the pixel value and the estimated pixel value of the respective pixel and quantization of the difference value in accordance with a difference value quantization rule;
- wherein the quantized difference values of the pixels are compressed in accordance with a compression rule.
A method of compressing image data which include a plurality of pixels, wherein each pixel can assume a plurality of pixel values, with the pixel values being coded and decoded again later, with a respective estimation value being determined in dependence on the pixel value of at least one predetermined other pixel for coding the pixel value of a respective pixel while using an estimation rule, with a difference value of the respective pixel being formed in dependence on the estimation value and on the pixel value, and with a respective reproduced estimation value being determined for the decoding of the pixel value of the respective pixel in dependence on at least one previously decoded pixel value of the predetermined adjacent pixel while using the estimation rule, with the reproduced estimation value being offset with the difference value of the respective pixel to determine a decoded pixel value of the respective pixel;
- wherein the pixels are provided in an arrangement of a plurality of rows, with the pixel values being coded in accordance with a predetermined row order such that pixel values of the respective third-next row and pixel values of the respective preceding row being alternately coded, with the determination of the estimated pixel values of the respective pixel taking place in dependence on the pixel value of at least one predetermined other pixel which is arranged in the row preceding it for the coding of pixel values of the named respective third-next line, and with the determination of the estimated pixel values of the respective pixel taking place in dependence on the respective pixel value of a plurality of other predetermined pixels which are arranged in the row preceding it and in the row following it for the coding of pixel values of the named respective preceding row.
A method of compressing image data which include a plurality of pixels, wherein each pixel can adopt a plurality of pixel values, with a quantization of the pixel values being carried out for at least some of the pixels while using at least one quantization rule, with the quantized pixel values being compressed in accordance with a compression rule, and with a quantization error being determined for the respective pixel, with the quantization error being taken into account for the later quantization of the pixel value of at least one other pixel.
A method of compressing image data which include a plurality of pixels, wherein each pixel can adopt a plurality of pixel values, with the pixels being coded and later decoded again, with a quantization of the pixel values being carried out for at least some of the pixels during the coding, with the quantization taking place in dependence on a predetermined noise value of the respective pixel, and with the determination of a back-transformed pixel value of the respective pixel also taking place during the decoding in dependence on the predetermined noise value of the respective pixel.
Dependencies are inferred from the claim text.