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Imaging device and method for controlling image compression ratio thereof

A camera device, image compression technology, applied in projection devices, printing devices, image communication and other directions, can solve problems such as inappropriate image compression rate and image quality degradation

Inactive Publication Date: 2011-10-12
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art described above, there is a problem that when the lens of the imaging device is moved from a scene with a lot of high-frequency components to a scene with a lot of low-frequency components, the compression rate of the image is not suitable, and the image quality deteriorates.

Method used

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  • Imaging device and method for controlling image compression ratio thereof
  • Imaging device and method for controlling image compression ratio thereof
  • Imaging device and method for controlling image compression ratio thereof

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Embodiment Construction

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0017] figure 1 It is a block diagram showing the configuration of the imaging device in the embodiment of the present invention. figure 1 The imaging device 111 includes: an imaging element 101 for inputting an image, an AFE (Analog Front End) 102 for converting an analog signal into a digital signal, an image processing LSI (Large-Scale Integrated circuit) 112, a memory 105 for storing image information, etc. and an LCD (Liquid Crystal Display) 110 for displaying images. The image processing LSI 112 has a wave detection processing circuit 103, an electronic hand shake processing circuit 104, an image processing circuit 106, a compression / expansion processing circuit 107 for compressing / expanding images by JPEG or MPEG, and a CPU (Central Processing Unit) 108, and an LCD interface 109 for display control.

[0018] The CPU 108 issues an operation request to the image...

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PUM

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Abstract

An input image is received from an imaging element (101). A detection circuit (103) detects frequency information relating to an input image. An electronic hand-shake processing circuit (104) detects hand-shake information (motion amount). A CPU (108) receives the frequency information and the hand-shake information via an image processing circuit (106). If the input image contains a plenty of high-frequency components, the CPU (108) increases the compression ratio. If the input image contains a plenty of low-frequency components, the CPU (108) lowers the compression ratio. Moreover, if the input image is moving, the compression ratio is increased and if the input image not moving, the compression ratio is lowered. A compression / decompression circuit (107) compresses an image in accordance with the compression ratio thus determined.

Description

technical field [0001] The present invention relates to an imaging device equipped with an image compression processing circuit, and also relates to an image compression ratio control method of the imaging device. Background technique [0002] In addition to imaging-dedicated devices such as digital still cameras and digital video cameras, portable terminals with cameras and the like are widely used. In these imaging devices, image data compression methods such as JPEG (Joint Photographic Experts Group) and MPEG (Moving Picture Experts Group) are used. However, if the input image is compressed step by step to a predetermined data size, the compression process will take a long time, and a large-capacity memory that holds all the data of the original image in advance is required. [0003] Therefore, in a certain prior art, based on the high-frequency components and low-frequency components in the horizontal direction and the high-frequency components and low-frequency compone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232G03B5/00H04N5/225H04N5/92H04N7/26H04N23/40
CPCG03B5/00H04N5/782H04N19/172H04N19/60H04N19/124H04N19/14H04N19/137H04N19/48H04N23/60H04N23/6811H04N23/68
Inventor 方城正博小川雅裕内田友和
Owner PANASONIC CORP