KR960040004A - Image Coding Device Using Wavelet Transform - Google Patents

Abstract

The present invention relates to an image encoding apparatus using wavelet transform. The present invention relates to a first image signal processing unit 510 for variable quantizing a diagonal edge component of a high frequency, that is, a D region, and a horizontal signal edge component of a high frequency. A second video signal processor 520 for vector quantizing the H region by variable block coding, a third video signal processor 530 for vector quantization of the high frequency vertical signal edge component, that is, V region, and a low frequency The diagonal edge components, that is, the LD region, the low frequency horizontal signal edge components, that is, the LH region, and the low frequency vertical signal edge components, that is, the LV region, are vector quantized by variable block coding, and the low frequency components without edge components, The LL region includes and comprises a fourth image signal processor 540 which performs discrete cosine transform (DCT) to prevent degradation of the edge portion and to reduce the low frequency component. By allocating bits to the to the image compression more efficient.

Description

Image Coding Device Using Wavelet Transform

As this is a public information case, the full text was not included.

FIG. 5 is a block diagram of a video encoding apparatus using wavelet transform according to the present invention, and FIG. 6 is a view showing an original image divided into variable blocks by the video encoding apparatus using wavelet transform according to the present invention of FIG.

Claims (2)

A video encoding apparatus using a diagonal edge obtained by first-order wavelet transform of an input original image, and a wavelet transform for outputting a horizontal edge, a vertical edge, and a low frequency signal, respectively, in the diagonal edge component region (D) of the high frequency wave. First image signal processing means (510) for detecting the outline and performing vector quantization after variable block coding; Second image signal processing means (520) for detecting a contour component in the high frequency horizontal signal edge component region (H), performing variable block coding, and quantizing the vector; Third image signal processing means (530) for vector quantization after variable block coding by detecting an edge component in the vertical signal edge component region (V) of high frequency; In the low frequency signal region L, the low edge diagonal edge component region LD, the low frequency horizontal signal edge component region LH, and the low frequency vertical signal edge component region LV are vector quantized by variable block coding and edge A low frequency component region (LL) having no component comprises a fourth image signal processing means (540) for performing an abnormal cosine transform (DCT). 2. The variable block encoding in the first to fourth video signal processing means (510, 520, 530, 540) is performed by encoding a 32 × 32 block in which an edge component is not detected, and detecting an outline. The video encoding apparatus using the wavelet transform, characterized in that the variable block encoding from 16 × 16 blocks to 4 × 4 blocks. ※ Note: The disclosure is based on the initial application.