Method and apparatus for generating and reproducing of compresse

Details Method and apparatus for generating and reproducing of compresse Method and apparatus for generating and reproducing of compresse

1996-11-05

1998-10-20

Tran, Phuoc

Image analysis

Color image processing

Compression of color images

382225, G06K 900, G06K 936

Patent

active

058259180

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a method for generating a compressed coloured video scene from a coloured original scene and to an apparatus for generating a compressed coloured video scene from a coloured original scene and for reproducing the compressed coloured video scene.
Conventionally, video scenes are recorded on video tapes and reproduced by special video recorders on the screen of a television apparatus or similar. There is the desire to be able to use the screen of a personal computer (PC) for reproducing video scenes and to store the video scenes digitally in a PC.
However, thereby the following problems arise, if a colour representation should be used. Conventionally, in a true colour method one bit is used for each colour so that 2.sup.24, i.e. about 16 million colours are present. This large number of colours must be reduced so that the PC can handle them. Conventionally, this takes place by giving a so-called standard colour palette including a certain number of colour values and to which the individual pixels of each single image, also called frame, are adjusted. According to another embodiment a so-called median-cut-algorithm is used which adjusts often used colours but which does not take care of details.
Furthermore, a single image may easily consist of 576 rows and 720 columns so that each individual image comprises a very large number of pixels. Therefore, the individual images cannot be stored pixel by pixel, however they must be compressed. Conventionally, this takes place in that a suitable transformation of pixel groups is carried out. A common transformation is the so-called DCT (Discrete Cosine Transform) wherein pixel groups of e.g. 8.times.8=64 pixels are described by Cosine-basic frequences. Simultaneously a quantification ignoring certain values and a so-called Huffmann-coding compressing according to statistical point of views are carried out. According to a different embodiment a differential image calculation is carried out wherein the deviation between two images are stored after a running time length compression method. In the first method additional hardware has to be employed for accelerating the method, in the second case very large data memories are necessary.
Furthermore, during the transition of one take to another take (in the following a take will also be called scene) large deviation may occur in the colour palette so that the colour values are not adjusted during a scene change.
Finally, PC operation systems typically supply a clock of a minimum of 1/18.2 s. Therefore, software video players generally do not use a clock and output the individual images as quickly as possible. An assignment with audio data being provided separately is very complicated. Therefore the movement of the lips of the actors do not coincide with the reproduced language. The running pictures are adapted to the sound in a jerking manner.
In EP 0 107 072 A2 a method for generating coloured video scenes is described wherein a non-linear transformation of the RGB representation is carried out for each scanned pixel element. By means of a lookup table, the division of the RGB colour space is carried out for each image. A common code word is calculated from the thus obtained three code words. From JP-4 152 386 A it can be taken that the total colour space is divided into a limited number of regions by a division means. Colors of the colour space wherein the colour distribution is fine are divided finely, and parts of the colour space wherein the colour distribution is coarse are divided coarsely. A mean is calculated for each region. Therefore, it is the object of the invention to provide a method and an apparatus for generating and reproducing compressed coloured video scenes wherein a quick, clean colour storage and a quick, clean colour and jerk-free reproduction is possible.
This object is solved by a method with the features of the claimed invention as well as by an apparatus with the features according to the claimed invention.
Preferred developments of the method can be taken from the

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