RU99118906A

RU99118906A - METHOD AND DEVICE FOR CODING AND DECODING OF A DIGITALIZED IMAGE

Info

Publication number: RU99118906A
Application number: RU99118906/09A
Authority: RU
Inventors: Андре КАУП
Original assignee: Сименс Акциенгезелльшафт
Priority date: 1997-01-31
Filing date: 1998-01-19
Publication date: 2001-07-27

Claims

1. A method for encoding a digitized image that has image objects with any number of image points, wherein the image points are encoded using a transform-compatible encoding, in which the transform-compatible encoding occurs so that the signal energy of the points to be converted The image in the local area is approximately equal to the signal energy of the converted image points in the frequency domain.

2. The method in accordance with claim 1 or 2, in which the conversion factors

converted image points

are formed in accordance with the following provision

moreover, N denotes the size of the image vector to be converted, which contained the converted image points;

denotes a transformation matrix of size N • N;
p, k indices are denoted by p, k ∈ [0, N-1].
3. The method in accordance with one of the preceding paragraphs, in which the image is encoded either in the internal image encoding mode, or in the image mutual encoding mode, in which the encoding with conversion consistent with the form is performed only in the image mutual encoding mode and in which The internal encoding of the image is carried out the second form-consistent coding with conversion, different from that consistent with the form of coding with conversion.

4. The method in accordance with claim 3, wherein a discrete cosine transform that is consistent with the form is used as the second form-coded transform transform.

5. A method for decoding a digitized image that has image objects with an arbitrary number of image points, wherein the image points are decoded using inverse transform-encoded encoding, in which the transform-decoding is converted in such a way that the energy of the signal to be converted image points in the local area is approximately equal to the signal energy of the converted image points in the frequency domain.

6. The method in accordance with one of the preceding paragraphs, in which a variant of a discrete cosine transform that is consistent with the form is used as the encoding with the transform consistent with the form.

7. The method according to claim 5 or 6, wherein the converted image points

are formed from conversion factors

in accordance with the following provision:

denotes a transformation matrix of size N • N;
p, k indices are denoted by p, k ∈ [0, N-1];
using () ^- denotes the inverse of the matrix.

8. The method in accordance with one of paragraphs.5-7, in which the decoding of the image is carried out either in the mode of internal decoding of the image, or in the mode of mutual decoding of the images, in which the encoding with conversion, consistent with the form, is carried out only in the mode of mutual decoding of images and which, in the mode of internal decoding of the image, a second transform-compatible encoding with a form is performed that is different from that consistent with the transform encoding form.

9. The method in accordance with claim 8, wherein a discrete cosine transform that is consistent with the form is used as the second form-coded transform transform.

10. The method in accordance with one of the preceding paragraphs., In which the coding consistent with the form with the conversion is applied only to blocks of the edge image.

11. A device for carrying out the method in accordance with one of the preceding paragraphs, in which the conversion coding device is provided for image-coding compatible with the conversion of image points and / or the conversion decoding device is provided for inverse coding with conversion of the points inverse Images.