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Image processing device

An image processing device, image signal technology, applied in image communication, solid image signal generator, signal generator with a single pick-up device, etc., can solve the problems of low frequency response characteristics, lower resolution of colored parts, etc.

Inactive Publication Date: 2009-01-28
PANASONIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there is such a problem that the chromaticity adjusted with the edge amount is used for the control of the weighting coefficient, thereby using the LPF output signal with low frequency response characteristics in the colored part, so the resolution of the colored part is lower than that of the achromatic part. rate drop

Method used

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no. 1 approach

[0036] FIG. 1 is a block diagram showing the configuration of an image processing device according to a first embodiment of the present invention. The image processing device includes an image signal input unit 10 , 1HRAM 12 a , 12 b , LPF 14 , 16 , a summer 18 , a feature quantity calculation unit 20 , a weight coefficient calculation unit 22 , a weighted summer 24 , and a horizontal contour correction unit 26 .

[0037] In the field read signal input from the image signal input section 10, a mixed signal of Cy (cyan) and Mg (magenta) and a mixed signal of Ye (yellow) and G (green) are alternately arranged in the (n) row, and Cy Mixed signals of (cyan) and G (green) and mixed signals of Ye (yellow) and Mg (magenta) are alternately arranged in the (n+1) row. As the image signal, a signal obtained by adding CDS / analog gain to the output signal of the imaging element and then AD-converted may be input directly, or an image signal previously recorded in a memory device may be seq...

no. 2 approach

[0056] 4 is a block diagram showing the configuration of an image processing device according to a second embodiment. The image processing device of the second embodiment has the same basic configuration as that of the image processing device of the first embodiment, except that a plurality of LPFs 16a to 16c having the same characteristics are provided. Furthermore, the image processing device of the second embodiment includes a vertical LPF (hereinafter referred to as “VLPF”) 28 and a weighted adder 30 .

[0057] The plurality of LPFs 16a to 16c receive the signal from the image signal input unit 10 and the output signals of the 1HRAMs 12a and 12b, and apply low-pass filter processing to the signals of the plurality of lines, respectively. LPF16a~16c is composed of (1+Z -1 ) / 2, sacrificing the frequency response characteristics and reducing the amount of spurious signals in the color boundary. However, even (1+Z -1 ) / 2 LPF also cannot eliminate artifacts in color boundari...

no. 3 approach

[0066] 6 is a block diagram showing the configuration of an image processing device according to a third embodiment of the present invention. The image processing device of the third embodiment has the same basic configuration as that of the image processing device of the second embodiment, and the third embodiment further includes an LPF 32 and a weighted adder 34 .

[0067] LPF32 for example has (1+3Z -1 +3Z -2 +Z -3 ) / 8 tap structure. Compared with LPF14 and LPF16a to 16c, LPF32 has a lower frequency response characteristic, and has a characteristic of suppressing false signals on color boundaries better than LPF14 and LPF16a to 16c.

[0068] In the third embodiment, the weighting coefficient calculation unit 22 calculates the weighting coefficients k and k2 and also calculates the weighting coefficient k3 used by the weighted adder 34 .

[0069] As described above, artifacts that become vertical stripes generated in a border with a hue of yellow or cyan cannot be reduc...

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Abstract

An image signal inputted from an image signal input unit (12) is introduced to LPF (14, 16) having different frequency response characteristics so as to remove a color signal component. A feature amount calculation unit (20) calculates an edge amount, color saturation, and a hue. A weight coefficient calculation unit (22) obtains a weight coefficient k from the feature amounts calculated by the feature amount calculation unit (20) and a change amount of them. According to the weight coefficient k calculated by the weight coefficient calculation unit (22), a weighted adder (24) performs weighted addition so as to frequently use an LPF (14) for passing a high-frequency component in an achromatic color portion or a chromatic color portion with a small color saturation and a small hue change and to frequently use an LPF (16) having few false signals in a chromatic portion with color saturation and a hue change. Upon reception of an output signal from the weighted adder (24), a horizontal contour correction unit (26) generates a horizontal contour correction signal. This suppresses the circuit scale and enables a user to obtain a high-quality image having a high resolution and few false signals.

Description

[0001] related application [0002] This application claims priority from Patent Application No. 2006-143668 filed in Japan on May 24, 2006, the contents of which are incorporated herein by reference. technical field [0003] The invention relates to image signal processing of a single-chip camera with complementary color. In particular, it relates to an image processing device for improving resolution in the horizontal direction or reducing artifacts of color borders. Background technique [0004] FIG. 7 is a structure of a signal processing circuit in a complementary color single-chip video camera disclosed in Japanese Patent No. 3540758. The LPFs 103 and 104 in the horizontal direction having different frequency response characteristics are composed of a first HLPF 103 having a multi-tap configuration and a second HLPF 104 having a few-tap configuration. First HLPF 103 has a characteristic of passing higher frequency components than second HLPF 104 . [0005] The outp...

Claims

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Application Information

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IPC IPC(8): H04N9/07
CPCH04N9/045H04N9/646H04N5/208H04N9/07H04N23/843H04N23/12
Inventor 隅谷一德矢田学樋爪太郎须部信芹沢正之中岛刚岩田秀规
Owner PANASONIC CORP
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