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Camera systemCamera system description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090262207, Camera system. Brief Patent Description - Full Patent Description - Patent Application Claims
The present invention relates to a camera system, and in particular, relates to a camera system used in a digital camera having an aperture value alteration function. Single-lens reflex digital cameras have been rapidly growing in popularity in recent years. With this single-lens reflex digital camera, when observing a subject using an optical viewfinder, the light (or the image of the subject) incident on an imaging optical system is reflected by a reflecting mirror arranged on the optical path, and guided to a viewfinder optical system. As a result, the subject image is converted into an erected image by a pentaprism and the like, and guided to the optical viewfinder. Therefore, a user can observe the subject image formed by the image optical system from the optical viewfinder. On the other hand, when the imaging optical system is used for photographing, the reflecting mirror is retracted from the photographing optical path. As a result, the viewfinder optical path is switched to the photographing optical path, and the reflecting mirror returns to a fixed position immediately when photographing ends. This system is the same for a conventional silver halide camera or a digital camera, if it is a single-lens reflex system. However, photographing using an optical viewfinder is extremely difficult for a beginner who is inexperienced with photographing using a digital camera. Consequently, a camera system having a monitor photographing mode in which it is possible to observe a subject using a liquid crystal display monitor when photographing has been proposed (for example, refer to Patent Document 1). Patent Document 1: Japanese published unexamined application JP2001-125173 Normally, this kind of camera system has an aperture value alternation function. In the case of the monitor photographing mode, real-time images captured sequentially with the set aperture values are displayed on a display device. Therefore, it is possible to check the depths of field which change according to the aperture value, via the display device. However, normally, the amount of light incident on the imaging sensor lessens if the aperture value becomes large, and the image displayed on the display device becomes dark. As a result, sometimes it is difficult to check the depth of field with some of the aperture values. A challenge of the present invention is to improve the convenience at the time of checking the depth of field, in a camera system having the aperture value alteration function. A camera system according to a first aspect of the present invention is a camera system for photographing a subject, and includes an imaging optical system, an imaging unit, an aperture adjustment unit, a display unit, and an image adjustment unit. The imaging optical system forms an optical image of the subject. The imaging unit converts the optical image into an image signal, and obtains an image of the subject. The aperture adjustment unit can adjust an aperture value of the imaging optical system. The display unit displays the image. The image adjustment unit adjusts the brightness of the image displayed on the display unit according to the aperture value. In this camera system, when the aperture value is changed, the brightness of the image is adjusted by an image adjustment unit according to the aperture value. As a result, regardless of the aperture value, the brightness of the image displayed can be kept to a degree which verification can be done easily. By doing so, in this camera system, the user can easily check the depths of field of images, without being affected by the difference in the brightness of images due to the difference in the aperture values. A camera system according to a second aspect of the present invention is the camera system of the first aspect, wherein the image adjustment unit amplifies the image signal according to the aperture value. A camera system according to a third aspect of the present invention is the camera system of the second aspect, wherein the image adjustment unit amplifies the image signal based on information on the relationship between the aperture value and the amplification factor of the image signal. A camera system according to a fourth aspect of the present invention is the camera system of the third aspect, further including an aperture value input unit to which the aperture value can be input. The display unit can display a standard image and a comparative image side by side. The standard image is an image obtained with a standard aperture value set in advance in the control unit. The comparative image is an image obtained with a set aperture value set in the aperture value input unit. A camera system according to a fifth aspect of the present invention is the camera system of the fourth aspect, further including an operation unit to which information can be input from the outside, and an image recording unit for recording the image. The standard image and comparative image are recorded in the image recording unit based on information inputted from the operation unit. Continue reading about Camera system... Full patent description for Camera system Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Camera system patent application. Patent Applications in related categories: 20090295934 - Color demosaicking using direction similarity in color difference spaces - Demosaicking optimizations are provided for still and/or moving image (e.g., video) processes that efficiently generate viewable images. A demosaicking process selects a direction before performing interpolation in order to avoid interpolation across edges and also to minimize color artifacts. The direction to be selected is based on a direction similarity ... 20090295937 - Dynamic range compression apparatus, dynamic range compression method, computer-readable recording medium, integrated circuit, and imaging apparatus - According to this D-range compression apparatus, D-range compression processing that places the D-range of the image signal within a predetermined output D-range is performed by the visual processing unit converting the tone of the image signal in accordance with the surrounding average luminance signal. Furthermore, with this D-range compression apparatus, ... 20090295935 - Electronic camera and control program of same - The invention relates to an electronic camera having self-detection function of foreign materials and a control program thereof. The electronic camera includes: an image sensor having an image pickup plane on an image plane of an optical system; a formation changing section changing a state of image formation of the ... 20090295933 - Imaging systems and methods for recovering object visibility - A system and method are provided for imaging in scattering media such as fog, water and biological tissues. Normally, such images suffer from poor visibility due to backscattering and signal attenuation. At least two images are taken of the scene using active widefield polarized illumination, with different states of a ... 20090295936 - Light quantity adjusting device, lens barrel and image pickup apparatus - Disclosed herein is a light quantity adjusting device including a base formed with a window; first and second diaphragm blades provided on the base and adapted to adjust a size of a diaphragm aperture; first and second cam-pins adapted to shift the first and second diaphragm blades; and a plurality ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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