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Image synthesizing and encoding method, image synthesizing and encoding device, and imaging system

An image synthesis and coding method technology, which is applied in the fields of image synthesis and coding, image synthesis and coding devices, and camera systems, can solve problems such as difficulty in problems, increased delay time, difficulty in realizing miniaturization and power saving, etc., so as to reduce access, Realize the effect of power saving

Active Publication Date: 2011-05-18
PANASONIC SEMICON SOLUTIONS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] In addition, when the combined image memory 32 is shared by the frame memory 31 and the reference image memory 33, and the storage unit 3 is constituted by using one large-capacity memory such as DRAM, the memory accesses generated in the processing of image synthesis and encoding are concentrated in one memory, so it is necessary to With high-speed and large-capacity DRAM, it is difficult to achieve miniaturization and power saving
In particular, in the case of synthesizing and encoding high-resolution moving images with HDTV resolution, the above-mentioned problem becomes a serious problem in terms of constituting the system
[0029] In addition, the composite image 10 is temporarily stored in the composite image memory 32, and the composite image 11 is read out from the composite image memory 32 and coded again at the time of encoding, so there is a problem that the delay time from the input of the current image to the start of encoding increases.
[0030] In addition, in the techniques disclosed in Patent Document 1 and Patent Document 2, a memory area for temporarily storing past images is separately required for synthesizing images, and it is difficult to solve the above-mentioned problems.

Method used

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  • Image synthesizing and encoding method, image synthesizing and encoding device, and imaging system
  • Image synthesizing and encoding method, image synthesizing and encoding device, and imaging system
  • Image synthesizing and encoding method, image synthesizing and encoding device, and imaging system

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no. 1 approach

[0074] figure 1 is a diagram showing the image synthesis encoding device 1 according to the first embodiment of the present invention, and Figure 13 The biggest difference of the shown conventional image composite encoding device 101 is that the composite image memory 32 in the storage unit 3 is unnecessary.

[0075] figure 1 The image synthesis encoding device 1 includes an input terminal 2 , a storage unit 3 , a setting terminal 4 , an image synthesis unit 5 , an encoding unit 6 and an output terminal 7 .

[0076] The current image is input to input terminal 2 in sequence.

[0077] The storage unit 3 includes a frame memory 31 and a reference image memory 33 . The frame memory 31 temporarily stores a current image required for image synthesis. The reference image memory 33 temporarily stores reference images required for encoding.

[0078] The setting terminal 4 sets the composition ratio α of the current image 8 sequentially input from the frame memory 31 and the pas...

no. 2 approach

[0103] image 3 It is a diagram showing a schematic configuration of an image composition encoding device 201 according to the second embodiment of the present invention. Figure 4 is a simple representation image 3 A diagram showing the internal structure of the encoding unit 6.

[0104] The difference from the first embodiment is that a reference image memory write control unit 21 ( Figure 4 ) and external setting terminal 20. The reference image memory writing control unit 21 writes the reconstructed image 13 generated in the encoding unit 6 into the reference image memory 33 on a frame-by-frame basis (updates the reference image memory 33) or does not write it (does not update the reference image memory 33). control. The external setting terminal 20 sets the update cycle of the reference image memory 33 to the reference image memory writing control unit 21 .

[0105] In the case of the first embodiment, the input current image and the past image are always synthesiz...

no. 3 approach

[0116] Figure 7 It is a flowchart of the image composition encoding method according to the third embodiment of the present invention. with the second embodiment ( Figure 5 ) is different in that the motion vector information obtained during sequential encoding in the encoding unit 6 is added to detect the overall motion of the composite image (ST300), so as to adaptively change the control of the update period of the reference image (ST301).

[0117] In the case of the second embodiment, with respect to the frame rate of the input image, the frame rate of the image remaining in the reference image memory 33 as a past image is fixed. Therefore, for example, in the case of capturing a scene with intense motion (the moving distance of the moving object per unit time is relatively large), and in the case of capturing a scene with smooth motion (the moving distance of the moving object per unit time is relatively small) , resulting in the problem of large differences in the re...

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Abstract

An image synthesizing and encoding method is provided with a synthesis step of synthesizing a present image and a past image at a predetermined synthesis ratio for each block to generate a synthetic image and an encoding step of successively performing moving image encoding of the synthetic images generated in the synthesis step. The method uses a reference image generated in the encoding step, as the past image in the synthesis step.

Description

technical field [0001] The present invention relates to an image synthesis encoding method and device thereof, and an imaging system equipped with these technologies, and particularly relates to a technique for sequentially encoding a synthesized image generated by combining a past image and a current image. Background technique [0002] In recent years, MPEG-2, MPEG-4, H.264, and other high-efficiency encoding technologies for moving images have been intensively studied and applied in various fields such as computers, communications, home AV equipment, and broadcasting. In addition, as high-definition flat-panel displays such as plasma displays and liquid crystal televisions are rapidly spreading in the market, moving images are rapidly becoming HDTV, and the amount of data to be processed in moving image encoding is also increasing. In particular, In household compact cameras such as movie cameras and digital still cameras that operate on small batteries, a large number of...

Claims

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Application Information

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IPC IPC(8): H04N7/32H04N5/232
CPCH04N19/00151H04N19/00781H04N7/50H04N19/00745H04N7/365H04N19/004H04N7/26664H04N7/26138H04N19/537H04N19/139H04N19/23H04N19/61
Inventor 北村臣二
Owner PANASONIC SEMICON SOLUTIONS CO LTD
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