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Image signal processing device and image signal processing method
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A technology of image signal processing and image signal, which is applied in the direction of image communication, TV, color TV parts, etc., and can solve problems such as no consideration
Inactive Publication Date: 2010-09-15
KK TOSHIBA
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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
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no. 1 Embodiment approach
[0025] 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.
[0026] The sensor core unit 11 has a pixel unit 12, a CDS 13 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.
[0027] 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 ...
no. 2 Embodiment approach
[0076] Figure 10 , Figure 11 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. That is, if Figure 10 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 11 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 35...
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Abstract
The present invention provides an image signal processing device and an image signal processing method. An imaging unit generates first and second image signals imaged using different exposure time based on a reference read voltage Vm. A synthesis circuit synthesizes the first and second image signals generated by the imaging unit. A detection unit detects luminance information of a specified subject using a synthesized image signal outputting from the synthesis circuit. A controller controls the reference read voltage of the imaging unit, the controller determines a first knee point based on luminance information of a specified subject detected by the detection unit, and controls the first knee point according to the reference read voltage.
Description
[0001] Cross References to Related Applications [0002] This application is based on and claims priority from Japanese Patent Application No. 2009-060934 filed on March 13, 2009, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to, for example, an image signal processing device used in a digital camera, etc., and relates to an image signal processing device and an image signal processing method having a function of expanding a dynamic range. Background technique [0004] Devices for expanding the dynamic range of, for example, CCD (Charge Coupled Device: Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor: Complementary Metal Oxide Semiconductor) image sensors used in digital cameras or digital video cameras have been developed (for example, Japan Special Technology Co., Ltd. Publication No. 2008-271368, Japanese Patent Application Publication No. 2007-124400). [0005] Japanese Pa...
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