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Image-data noise reduction apparatus and method of controlling same

一种图像数据、噪声降低的技术，应用在降低图像数据噪声的设备领域，能够解决图像分辨率下降等问题

Inactive Publication Date: 2009-08-05
FUJIFILM CORP
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Problems solved by technology

However, since this method filters the entire image data, sometimes the resolution of the image will drop

Method used

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  • Image-data noise reduction apparatus and method of controlling same
  • Image-data noise reduction apparatus and method of controlling same
  • Image-data noise reduction apparatus and method of controlling same

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Embodiment Construction

[0025] First, the principles of the embodiments of the present invention will be described.

[0026] figure 1 The relationship between the amount of incident light and the output signal level on a solid-state electronic image sensing device is illustrated.

[0027] The output signal level rises as the amount of incident light increases. Solid-state electronic image sensing devices contain a light-dark region. The video signal obtained from this light and dark area is regarded as a black level video signal. In a digital camera, the video signal output by the solid-state electronic image sensing device is offset corrected in such a way that the black level video signal becomes zero. Offset levels are defined for offset correction. Signals with a level lower than this offset level are clamped during offset correction.

[0028] Since the level of the video signal obtained from the light and dark areas is the black level, there should be no levels below this offset level in th...

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Abstract

A CCD that outputs a video signal has an optical black area. The level of a video signal obtained from the optical black area is adopted as a black level in the execution of an offset correction. A video signal whose level is below an offset level used in the offset correction is thought of as representing a noise pixel. The noise pixel is detected before the video signal is clipped at the offset level by the offset correction. The noise pixel that has been detected undergoes pixel interpolation using pixels surrounding the noise pixel. Since the noise pixel is replaced by a pixel generated by pixel interpolation, noise is reduced in the image obtained.

Description

technical field [0001] The present invention relates to a device for reducing noise in image data, a method for controlling the device, and a control program. Background technique [0002] Since recent digital cameras require high-sensitivity imaging techniques, the role of noise in an image cannot be ignored. In particular, sometimes low to medium luminance noise in an image appears as black dots, and sometimes this noise becomes conspicuous. In order to solve this problem, the prior art is to use median filtering on image data to reduce noise (see Japanese Patent Application Laid-Open Specification No. 4-235472). However, since this method filters the entire image data, sometimes the resolution of the image is degraded. SUMMARY OF THE INVENTION [0003] Accordingly, it is an object of the present invention to reduce noise without reducing image resolution. [0004] According to a first aspect of the present invention, the above object is achieved by providing an appar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/21H04N5/217H04N5/14H04N23/76H04N25/00H04N25/65
CPCG06T5/005G06T5/20G06T5/009G06T2207/10024G06T5/92G06T5/77
Inventor 大石诚
Owner FUJIFILM CORP
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