US 7,444,020 B2 · Reduction of rounding errors during the processing of digital image data

Abstract

In order to avoid rounding errors as a result of restricted accuracy of the processing unit in a video processing arrangement, a comparison is carried out between processed image data and unprocessed image data. For this purpose, the unprocessed image data is buffer-stored in a memory and is supplied together with the processed image data to a comparator, which compares the difference between the processed image data and the unprocessed image data with a threshold value. Either the processed image data or the unprocessed image data is produced at the output of the arrangement, by means of a multiplexer, as a function of the result of the comparison. A rounding element between the processing unit and the multiplexer rounds the processed image data before it is emitted, if the processing stage has not itself carried out a rounding process.

Claims13

Dependent claims

An arrangement for processing digital image data, having an image data input with the word length m and a control input with the word length n, which image and control data are supplied to a processing stage which emits the processed image data at an output, and having an image data output with a word length of p, wherein a comparator is provided, to which the image data input is connected via a memory and the output of the processing stage is connected, wherein the comparator compares the difference between the processed image data and the stored image data with a comparison value, and drives a multiplexer as a function of the result of the comparison, to whose inputs the processed image data and the stored image data are applied, and whose output is connected to the image data output.

Dependencies are inferred from the claim text.

Reduction of rounding errors during the processing of digital image data

Life of this patent

Reduction of rounding errors during the processing of digital image data

Life of this patent

Abstract

Claims13