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Image signal processor

An image signal processing and image signal technology, which is applied in image data processing, image communication, image enhancement, etc., can solve problems such as image quality degradation, and achieve the effect of suppressing image quality degradation and alleviating interference

Inactive Publication Date: 2005-07-27
SANYO ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, in the case of contour enhancement, since the shot noise is clearly displayed on the screen, the deterioration of the image quality due to the increase of the shot noise accompanying the increase of the exposure time also becomes conspicuous.

Method used

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Embodiment Construction

[0020] Next, embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

[0021] figure 1 It is a schematic block diagram showing the configuration of an image signal processing device according to an embodiment of the present invention, and generates image data subjected to gradation correction and contour correction based on an image signal output from the imaging element 20 . Here, the imaging element 20 is a CCD image sensor, and an image signal Y0(t) output from the imaging element 20 is input to the analog signal processing circuit 22 . The analog signal processing circuit 22 performs processing such as sample hold and automatic gain control (AGC: Auto Gain Control) on the image signal Y0(t) to generate an image signal Y1(t) conforming to a predetermined format. The A / D conversion circuit 24 converts the image signal Y1(t) output from the analog signal processing circuit 22 into digital data, and outp...

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Abstract

The present invention provides an image signal processing device for processing image signals generated by pick-up element and restricting noise from being increased with exposing time. The image signals are respectively input into LPF (40, 42), which have different transmission characteristics from each other, while outputs of these LPFs are selected by a selector (44) and transmitted to a gamma correction circuit. The selector (44) is switched by a filter control circuit (32). In the filter control circuit (32), a comparator (60) compares an exposing time E of a present frame with a threshold value R. In a condition that the exposing time E is greater than R, the selector (44) is controlled such that the output of the LPF (42) is selected, wherein the cut off frequency of the output of the LPF (42) is relatively lower and the removing effect of noise component is greater, comparing to that of the LPF (40).

Description

technical field [0001] The present invention relates to an image signal processing device for processing an image signal generated by an imaging element, and particularly relates to a technique for suppressing noise corresponding to exposure time in the imaging element. Background technique [0002] In an imaging device such as a digital camera, an image signal with an appropriate signal level can be obtained by automatically or manually adjusting the exposure time according to the brightness of the subject. [0003] Figure 6 It is a block diagram showing the configuration of a conventional image signal processing device that processes an image signal generated by an imaging element. The image signal output from the image sensor 2 such as a CCD (Charge Coupled Device) image sensor is processed in the analog signal processing circuit 4, converted into digital data in the A / D conversion circuit 6, and input to the digital signal processing circuit 8. The digital signal proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/208H04N1/40H04N1/409H04N5/213H04N5/225H04N5/232
CPCH04N1/4092G06T5/73
Inventor 高桥达也中井智通中茎俊朗
Owner SANYO ELECTRIC CO LTD
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