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Digital broadcasting receiving apparatus

A technology for digital broadcasting and receiving devices, which is applied in the fields of digital video signal modification, TV, color TV components, etc., can solve the problems of generating block noise, noise, etc., and achieve the effect of high image quality

Inactive Publication Date: 2007-10-10
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In digital broadcasting, digital image signals are encoded according to MPEG-4 (Moving Picture Coding Experts Group Phase 4) and H.264 / AVC (Advanced Video Coding: Advanced Video Coding), etc. Conditions and states generate block noise and mosquito noise in the decoded reproduced image
For example, when a low encoding bit rate is set, or when encoding images with a lot of intense movement, such as sports broadcasting, etc., the above-mentioned noise is likely to occur.

Method used

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no. 1 example

[0032] [explanation of the overall constitution]

[0033] A configuration example of a digital broadcast receiving apparatus to which the present invention can be applied will be described with reference to FIG. 1 . In FIG. 1, a digital broadcast receiving device 1 is a portable or transportable digital broadcast receiving device such as a mobile phone, a node personal computer (node ​​PC), a car navigation system, or the like. However, the digital broadcast receiving device 1 is similarly applicable to a PDP-TV, an LCD-TV, and other installation-type television display devices, and can also be applied to a DVD player and an HDD player. The digital broadcast receiving device 1 of this embodiment has an external antenna 2 for receiving, for example, a 1-segment broadcast as a digital broadcast signal, a broadcast receiving and reproducing circuit 6 for reproducing the received digital broadcast signal, and a broadcast receiving and reproducing circuit 6 for displaying informati...

Embodiment 2

[0093] Next, a second embodiment of the present invention will be described. In the first embodiment described above, the set edge enhancement amount is applied to all pixels within a block. In contrast, in the second embodiment, the amount of edge enhancement is changed according to the pixel position within the block. Specifically, the amount of edge enhancement to be given to each pixel is set with reference to the amount of edge enhancement of a block adjacent to the block. The details will be described with reference to FIGS. 17 and 18 .

[0094] FIG. 17 shows an example of a method of setting an edge enhancement amount for a certain block in consideration of the edge enhancement amounts of blocks adjacent to the certain block in the horizontal direction. In this embodiment, the edge enhancement amount for each pixel in the block MBs1 of the input image 200 is changed using the edge enhancement amount EMs1 for the block MBs1 and the edge enhancement amounts EMs0 and EMs...

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Abstract

Disclosed herein is a digital broadcasting receiving apparatus that can offer high-definition images with appropriate image quality correction by setting the quantity of image quality correction with reference to encoding information and image information in pixel blocks. The apparatus includes an image processing unit for performing image processing on decoded image signals. This image processing unit has a noise detection unit for detecting noise information for each pixel block based on encoding information of images included in digital broadcasting signals, a setting unit for setting the quantity of image quality correction based on noise information detected by the noise detection unit and image information for each pixel block of the decoded image signals, and a unit for performing image quality correction on each pixel block of the decoded image signals with the quantity of image quality correction set by the image quality setting unit.

Description

technical field [0001] The present invention relates to a technique for correcting image quality in a digital broadcast receiving device capable of receiving digital broadcast signals. Background technique [0002] In digital broadcasting, digital image signals are encoded according to MPEG-4 (Moving Picture Coding Experts Group Phase 4) and H.264 / AVC (Advanced Video Coding: Advanced Video Coding), etc. Conditions and states generate block noise and mosquito noise in the decoded reproduced image. For example, when a low encoding bit rate is set, or when an image with a lot of intense movement is encoded, such as sports broadcasting, etc., the above-mentioned noise is likely to occur. As a technique for reducing noise related to such encoding, for example, the technique described in Japanese Patent Application Laid-Open No. 2003-18600 is known. This patent publication discloses a technique of predicting the appearance of the above-mentioned noise using quantization informat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/30H04N7/26H04N5/44H04N5/208H04N7/32H04N19/102H04N19/136H04N19/139H04N19/14H04N19/146H04N19/196H04N19/44H04N19/50H04N19/503H04N19/513H04N19/60H04N19/61H04N19/625H04N19/70H04N19/86
CPCH04N19/00151H04N21/44008H04N5/208H04N5/4401H04N19/00909H04N19/00187H04N19/00545H04N19/002H04N19/00278H04N7/2617H04N19/00193H04N19/139H04N19/176H04N19/46H04N19/15H04N19/152H04N19/154H04N19/86H04N21/426
Inventor 秋山靖浩浜田宏一山口宗明丸山隆鸭川浩二影山昌广
Owner HITACHI LTD