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Image signal processing method

A technology of image signal processing and image signal, applied in image communication, TV, color TV components and other directions, can solve problems such as no consideration

Inactive Publication Date: 2014-05-21
青岛威力电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, it is also desirable to optimize the knee point based on the brightness level of an important subject such as a face, but such control has not been considered in the past

Method used

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Examples

Experimental program
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Embodiment 1

[0029] figure 1 It is a diagram showing the image signal processing device according to the first embodiment of the present invention, and shows, for example, the structure of an amplification type CMOS (complementary metal oxide semiconductor) image sensor. First, refer to figure 1 A schematic configuration of the image signal processing device will be described.

[0030] The sensor core unit 11 has a pixel unit 12, (3) S13 as a column-type noise canceling circuit, a column-type analog-to-digital converter (ADC) 14, a latch circuit 15, two line memories (MSTS, MSTL) 28-1 , 28-2, etc.

[0031] The pixel unit 12 photoelectrically converts light incident through the lens 17 to generate charges corresponding to the amount of incident light. In the pixel portion 12 , a plurality of cells (pixels) are arranged in a matrix on an unshown semiconductor substrate. One cell PC is composed of four transistors (Ta, Tb, Tc, Td) and a photodiode (PD). Pulse signals ADRESn, RESETn, and ...

Embodiment 2

[0076] Figure 9 , Figure 10 It is a figure which shows 2nd Embodiment, The same code|symbol is attached|subjected to the same part as 1st Embodiment, and only a different part is demonstrated.

[0077] As described in the first embodiment, when an image with an extended dynamic range is also displayed on the display device, a narrower range such as a bitmap (BMP) file, for example, sRGB8 bits is used. Therefore, it is necessary to efficiently compress an image with an expanded dynamic range.

[0078] In the second embodiment, brightness information of a face as an important subject is also used for dynamic range compression. Such as Figure 9 As shown, the brightness information of the face output from the AE detection unit 38 is also supplied to the dynamic range compression unit 35 .

[0079] Figure 10 An example of the dynamic range compression unit 35 is shown, but it is not limited thereto. The dynamic range compression unit 35 includes a conversion unit 35a for ...

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PUM

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Abstract

The invention discloses an image signal processing method. The method comprises the following steps: (1) synthesizing a first image signal and a second image signal generated by a specific shot subject shot at different exposure time, according to a reference read out voltage; (2) detecting the brightness information of the specific shot subject according to synthesized image signals; (3) setting the brightness information of the specific short subject to target brightness information through exposure control; (4) deciding a first inflection point according to the target brightness information, and controlling the referential read out voltage according to the first inflection point; and (5) compressing the dynamic scope of the synthesized image signals, wherein a second inflection point is decided according to the detected brightness information. According to the method, the dynamic scope can be expanded when the image quality of the important shot subject is degraded.

Description

technical field [0001] The present invention relates to an image signal processing device used in digital cameras and the like, and more particularly to an image signal processing method with a function of expanding the dynamic range. Background technique [0002] Devices that expand the dynamic range of image sensors such as CXD (Charge Coupled Device: Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor: Complementary Metal Oxide Semiconductor) used in digital cameras or digital video cameras have been developed today ( For example, JP-A-2008-271368 and JP-A-2007-124400). [0003] Japanese Patent Application Laid-Open No. 2008-271368 discloses a technique for analyzing luminance information such as luminance histograms for a composite image generated from a long-time exposure image signal and a short-time exposure image signal during imaging in the exposure setting mode. graph (frequency distribution), and control the exposure of the short-time exposure...

Claims

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Application Information

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IPC IPC(8): H04N5/232H04N5/235
Inventor 不公告发明人
Owner 青岛威力电子科技有限公司