Optical low pass filter and imaging device using the same

Abstract

An optical low pass filter (2) is formed, for example, by a birefringent plate so as to control the light beam separation width, thereby changing the cut-off frequency according to an imaging mode. The number of pixels of an imaging element (5) is set greater than the number of pixels corresponding to the dynamic image display resolution. In a still image capturing mode, the light beam separation width is set narrower so that the resolution of the imaging element (5) can be used as it is while suppressing generation of a false color to a certain degree. On the other hand, in a dynamic image capturing mode, the light beam separation width is set wider so that a high-frequency component corresponding to an unnecessary resolution component for an output image signal can be cut off and suppression of the false color can be performed strongly as compared to the still image capturing mode.

Description

technical field [0001] The present invention relates to an optical low-pass filter and an imaging device using the optical low-pass filter, and is particularly suitable for an optical filter for removing high-frequency components by utilizing blurring of an image. Also, it is applicable to a hybrid camera capable of capturing both moving images and still images with one camera. Background technique [0002] In recent years, so-called hybrid cameras capable of capturing both moving images and still images with one camera have been provided. Also, studies for improving the image quality of captured moving images and still images are ongoing. For example, in almost all hybrid cameras, a sensor with a higher pixel count is used to increase the resolution of still images. In addition, suppression of false color (moiré) caused by sampling is also an important factor in improving image quality. [0003] Here, the principle of generating false colors will be described. The imagi...

AI Technical Summary

Problems solved by technology

However, for still images / moving images, there is a tendency to prioritize high resolution over low false color

[0016] When manufacturing a hybrid camera capable of capturing both still images and moving images with a single camera, it is not possible to set appropriate frequency characteristics for both still images and moving images in the optical low-pass filter

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