JPH03266576A - Solid-state image pickup device - Google Patents

Abstract

PURPOSE:To eliminate fixed pattern noise and to eliminate the loss of picture information to improve the picture quality by displacing an object image formed on a solid-state image pickup element face and transposing picture signals of respective frames with a picture element as the unit in accordance with the extent of displacement of the object image and integrating the transposed picture signals. CONSTITUTION:Infrared light from an object 10 is condensed by a lens 11 and is made incident on a rotating V-shaped mirror 12 and is reflected by this mirror and is reflected by a plane mirror 15 and is made incident on a two-dimensional infrared solid-state image pickup element 16. A rotation angle detector 17 is provided for the rotating V-shaped mirror 12 and generates an angle detection signal in accordance with the angle of rotation of the mirror 12. A transposing circuit 20 accesses a reference data memory 21 to transpose picture signals of respective frames in accordance with this detection signal, and these transposed signals are integrated with a picture element as the unit. Thus, the variance of the output signal is reduced, and the occurrence of fixed pattern noise is suppressed and the loss of picture information due to defective picture elements is prevented to improve the picture quality.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a solid-state imaging device using a solid-state imaging device, and aims to improve image quality by removing fixed pattern noise and eliminating the loss of image information that should be received by defective pixels. an image sensor, an optical displacement means for displacing a subject image formed on the surface of the solid-state AM element, and rearranging the image signals of each frame output by the solid-state image sensor in units of pixels according to the amount of displacement of the subject image. The apparatus includes a rearranging means and an integrating means for integrating the rearranged image signals.

[Industrial application field]

The present invention relates to a solid-state image device, and particularly relates to a solid-state image device using a solid-state image sensor.

For solid-state image sensors other than visible light, device manufacturing technology has not advanced enough to manufacture a perfect solid-state image sensor without defective pixels. For this reason, a correct image cannot be obtained due to defective pixels on the solid-state image carrier. Moreover, since a fixed pattern, which is a variation in the output from each pixel, occurs, the SN ratio increases. Therefore, it is necessary to reduce fixed pattern noise on the solid-state imaging device side so that a correct image can be obtained even if a defective pixel exists.

[Prior Art] In a conventional solid-state imaging device, an optical system such as a lens focuses an image onto a solid-state imaging element, and processes signals for each pixel to create an image. Moreover, when there is a defective pixel on the infrared solid-state image sensor, a method has been taken to replace it with information from an adjacent pixel.

[Problem to be solved by the invention]

Conventionally, since information on a defective pixel is replaced with information on an adjacent pixel, there has been a problem in that image information that should be received by the defective pixel is lost.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a solid-state imaging device that eliminates fixed pattern noise, eliminates loss of image information due to defective pixels, and improves image quality.

[Means to solve the problem]

The solid-state imaging device of the present invention includes: a solid-state imaging device; an optical displacement unit for displacing a subject image formed on the surface of the solid-state imaging device; It has a rearranging means for rearranging according to the amount of displacement, and an integrating means for integrating the rearranged image signals.

(Operation) In the present invention, by displacing the subject image with respect to the solid-state image sensor, and rearranging and integrating the image signals output from the solid-state 1isit element according to the amount of displacement, each part of the subject image is transferred to the solid-state m-element. Detects defective pixels and integrates and averages them.This reduces output signal variations, suppresses fixed pattern noise, and prevents loss of image information that would otherwise be suffered by defective pixels, improving image quality. do.

(Example) FIG. 1 shows a configuration diagram of an embodiment of the apparatus of the present invention.

In the figure, infrared light from a subject 10 is condensed by a lens 11 and incident on a rotating V-luminor 12, and after being reflected by a first surface 12a and a second surface 12b of the rotating V-luminor, it is reflected by a flat surface 115. The light is reflected and incident on the two-dimensional infrared internal body image sensor 16 .

Here, if the subject 10 is divided into small sections and numbered as shown in FIG.
, the rotation angle O° at which the straight line 12c of the joint of 12b stands upright.
Then, the subject image of each section is formed on the image sensor 16 as shown in FIG. 2(B).

Further, each time the rotating V-luminor 12 rotates by 45 degrees, a subject image of each section is formed on the image carrier 16 as shown in FIGS. 2(C), 2(D), and 2(E), respectively.

Rotation: The mirror 12 is provided with a rotation angle detector 17, which generates angle detection signals shown in (8) to (E) in FIG. 3 (A) according to the rotation angle of the mirror 12 shown in FIG. 3 (A), and performs signal processing. Supplied to circuit 18. The signal processing circuit 18 has the configuration shown in FIG. The rearrangement circuit 20 generates a drive signal as shown in FIG. 3(F) from the fall of each angle detection signal, which instructs the image sensor 16 to accumulate charges by photoelectric conversion, and supplies it to the image sensor 16. An image signal is obtained from each pixel of the image sensor 16 in the shaded area of the accumulated signal shown in FIG. The rearrangement circuit 20 accesses the reference data memory 21 in accordance with the angle detection signals of O', 45°, 90°, 135°, and reads the data as shown in FIG.
), (C).

A conversion matrix for rearranging the pixels shown in (D) and (E) respectively to the partition positions shown in FIG. write to. Of course, in this case, the image signals are rearranged pixel by pixel.

The integration circuit 23 calculates the rotation angle 0' of the rotating V-luminor 12,
The image signals of the rearranged frames of 45', 90° and 135° are integrated pixel by pixel and outputted from the terminal 24.

The integrated image signal output from the signal processing circuit 18 is amplified by an amplifier 30 shown in FIG. 1 and displayed on a monitor 31.

For example, regarding section No. 6 in FIG. 2(A), it is detected by the pixel 16a of the image sensor 16 shown in FIG. 2(B) at a rotation angle of 0°, and by the pixel 16a shown in FIG. 16b
Pixel 1 shown in the same figure (D>) is detected at a rotation angle of 90''.
6c, and at a rotation angle of 135°, it is detected at pixel 16d shown in FIG.
6c.

The outputs of each section 16d are added to obtain the integrated image signal of section No. 6. Like this III! Since the detection outputs of different pixels of the element 16 are integrated and averaged, variations in the output signal are reduced and fixed pattern noise is eliminated. Furthermore, it is possible to prevent the loss of image information in the section No. 6 that should be received by the defective pixel (for example, 16a).

In the above embodiment, the subject image is rotationally displaced with respect to the image sensor 16, but this may be configured to linearly displace the subject image vertically or horizontally with respect to the image sensor 16, and is limited to the above embodiment. Not done.

〔Effect of the invention〕

As described above, the solid-state imaging device of the present invention prevents the generation of fixed pattern noise, eliminates the loss of image information caused by defective pixels, improves image quality, and is extremely useful in practice.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the device of the present invention, FIG. 2 is a diagram showing the correspondence between a subject and an image sensor, and FIG. 3 is a timing chart of the rotation of the rotating V-shaped mirror and each signal. FIG. 4 is a block diagram of the signal processing circuit. In the figure, 12 is a rotating V-shaped mirror 15 is a plane mirror, 16 is a two-dimensional solid-state image pickup device, 17 is a rotation angle detector, 20 is a rearrangement circuit, 21 is a memory for reference data, 22 is a memory for integrated data, and 23 is an integration Shows the circuit.

Claims (1)

[Claims] A solid-state image sensor (16), an optical displacement means (12) for displacing a subject image formed on the surface of the solid-state image sensor (16), and each output of the solid-state image sensor (16). A rearranging means (20) for rearranging the image signals of frames in pixel units according to the amount of displacement of the subject image; and an integrating means (23) for integrating the rearranged image signals.
A solid-state imaging device comprising: