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Image processing device and method

An image processing device and image technology, applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of product cost increase, image encoder, etc., and achieve the effect of suppressing the deterioration of image quality

Active Publication Date: 2019-07-19
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the recent increase in the capacity of image data or 4K TV tends to increase the amount of data to be processed by image encoders
Therefore, the external DRAM chip must have higher capacity and wider frequency band, which is one of the reasons for the increase in product cost

Method used

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  • Image processing device and method
  • Image processing device and method
  • Image processing device and method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0082] 2. First Embodiment (Picture Coding Apparatus Controlling GOP Structure)

[0083] 3. Second embodiment (image encoding device using long-term reference frame)

[0084] 4. Third Embodiment (Image Coding Device Controlling Execution of Simple Compression)

no. 4 example

[0085] 5. Fourth Embodiment (Image Coding Device in HEVC / AVC)

[0086] 6. Fifth Embodiment (Image Coding Device Performing Constrained Intra Prediction)

[0087] 7. Other

[0088]

[0089]

[0090] In the related art, techniques of compressing image data, transmitting the image data, and decompressing the transmitted data are considered. This makes it possible to reduce the amount of information at the time of transmission. For such compression and decompression techniques for image data, for example, Motion Picture Experts Group 2 (MPEG-2), MPEG-4 Part 10 (hereinafter also referred to as Advanced Video Coding, or AVC), High Efficiency Video Coding (HEVC) Standardization of the specification of encoding and decoding schemes.

[0091] In these encoding and decoding schemes, images of frames processed in the past may be referenced and used to encode the current frame. In one example, at the time of encoding, the predicted image of the image of the frame to be processed (...

no. 2 example

[0140]

[0141] Furthermore, instead of controlling the GOP structure (length), a long-term reference frame may be used. In one example, something like Figure 12 The GOP structure shown in , sets the interval between I pictures so that it can be Figure 8 A long-term reference frame (long-term reference) similar to AVC, HEVC, etc. is used in the GOP structure of (M=1 / N=300, long-term reference). In other words, the frame memory 117 stores the decoded image as a short-term reference frame or a long-term reference frame, and the long-term reference frame is stored for a longer period than the short-term reference frame.

[0142] exist Figure 12 In the case of the GOP structure, one GOP has 300 frames, and a long-term reference frame is used as a reference image every 30 frames, as shown by arrows 201 and 202 . Then, the long-term reference frame is updated every 30 frames. In one example, a frame I0 with a frame number of 0 (which is the head frame of a GOP) is set as a ...

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Abstract

The present disclosure pertains to an image processing device and method with which a reduction in image quality can be suppressed. A predicted image is generated by using inter-prediction, which usesas a reference image an image of a prior frame that has been encoded and stored in a frame memory, and has been read from the frame memory, decoded, and processed before the current frame, and restricted intra-prediction, which does not use peripheral pixels for which inter-prediction was performed. The present technology can be applied to image processing devices, image encoding devices, and thelike.

Description

technical field [0001] The present disclosure relates to an image processing device and method, and in particular, to an image processing device and method capable of suppressing image quality deterioration. Background technique [0002] In the case of image encoding implemented by hardware, in many cases the frame memory used to hold reference frames is usually installed as an external dynamic random access memory (DRAM) chip separate from the large scale integration (LSI) used for encoding . In such a frame memory, it is necessary to hold multiple reference frames or to have high-speed access capability in processing such as motion estimation (ME) or motion compensation (MC), which requires sufficiently high data storage capacity and a sufficiently wide data input or Output frequency band. [0003] However, the recent increase in the capacity of image data or 4K TVs tends to increase the amount of data to be processed by image encoders. Therefore, the external DRAM chip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/426H04N19/105H04N19/11H04N19/114H04N19/137H04N19/14H04N19/58
CPCH04N19/105H04N19/14H04N19/58H04N19/159H04N19/172H04N19/137H04N19/11H04N19/426H04N19/114
Inventor 北村卓也上木伸夫
Owner SONY CORP