JPS60191568A - Electronic camera device - Google Patents

Abstract

PURPOSE:To prevent a mistake of image pickup by providing a low pass filter into an optical view finder so that the resolution of an image pickup system and a video recording and reproducing system is made identical to that of a picture observed from the view finder. CONSTITUTION:The optical low pass filter 20 is arranged in the optical view finder 6 between a half mirror 4 and a mirror 5. Thus, a picture transmitted through the optical low pass filter 20 is observed from the finder. The resolution of a picture reproduced via the image pickup system and the video recording and reproducing system is made identical to the resolution of the picture observed from the optical view finder 6.

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to an electronic camera device equipped with an optical viewfinder. The present invention relates to an electronic camera device that can match the resolution of images.

(Prior Art) Conventionally, there have been an imaging device that receives optical image information and generates an electrical signal according to the amount of received light, a recording device that processes the output of the imaging device and records it in a storage device, and an optical viewfinder. An electronic camera device is known. As examples of this type of camera device, electronic still cameras and video cameras are known. This type of electronic camera device aims the objective lens toward the subject, looks through an optical viewfinder, determines the image area to be photographed, captures image information from the imaging device, and records it in the recording device. It has become.

FIG. 1 is a block diagram showing one embodiment of an electronic camera device. In the figure, X is the subject, 1.2 is the lens, 3 is the diaphragm that adjusts the amount of light, and 4 is the half mirror that receives the incident light.
Reference numeral 5 denotes a mirror that receives the reflected light from the half mirror 4.

The mirror 5 is provided inside the optical viewfinder 6, and the reflected light from the mirror 5 enters the human eye and is observed as a subject image. This optical viewfinder 6
It is completely independent of the optical system of the imaging system (described later), and can be used to focus the matte surface or create a split image to improve the ease of focusing, brightness of the image, and ease of use. is prioritized. 7 is an optical low-pass filter that receives the light transmitted through the half mirror 4 as incident light. The low-pass filter 7 filters the image signal in order to prevent moire from occurring due to the relationship between the pixel pitch of the imaging device (the pixel pitch for solid-state imaging devices, the pitch of the color separation filter for image tubes) and the spatial frequency of the image. Optically power the fine components.

This is a low-pass filter attached to the front of the imaging device. 8 is an imaging device that receives the light that has passed through the filter 7 and generates an electrical signal according to the amount of received light. The imaging device 8 is, for example, a COD.

Solid-state imaging devices such as MOS type and CPD, and various other m-image tubes are used. Reference numeral 9 denotes a signal processing circuit that performs various signal processing upon receiving the output of the imaging device 8, and also provides an optimum aperture value to the aperture 3. The details of signal processing include R (red) and G, which are performed when recording color images.
(green) and B (blue), and the output signal of the imaging device @8 (
In the case of color recording, there is a modulation process that modulates the separation signal).

Reference numeral 10 denotes a recording device that records the image signal output modulated by the signal processing circuit 9 onto a recording device 11 such as a magnetic disk or magnetic tape. The recording device 10 usually has a magnetic head (
Image information is recorded in the storage device 11 via a memory card (not shown).
Ru.

To explain the operation of the device configured in this way, the operator first looks through the viewfinder 6 and confirms the image of the subject ) to record the subject image.

That is, the image signal converted into an electrical signal by the imaging device 8 is
After being subjected to predetermined signal processing in the subsequent signal processing circuit 9, the signal is recorded in the storage device @11 by the recording device 10. Although not shown in the figure, in order to perform the shutter operation, it is necessary to use a mechanical shutter or an electronic shutter by controlling the storage operation of the solid-state image sensor.

Incidentally, in an electronic camera device equipped with such an optical viewfinder 6, optical image information incident through the lens 1 is separated into an optical picot finder system and an imaging system by a half mirror 4. Therefore, theoretically, the subject image seen through the optical viewfinder 6 and the subject image recorded in the storage device 11 are the same. However, as is clear from the figure, the optical viewfinder 6 has a configuration completely independent of the image nodal system, so that characters, etc. that are resolved and visible in the finder are recorded and reproduced by a recording/playback device (not shown). When you record or play back the image, it often happens that the image is not resolved and cannot be read. This is because the resolution of the finder is different from the resolution of the imaging system and the recording/playback system. It is expected that such problems will become a bigger problem in the future as electronic still cameras are increasingly used to take advantage of the low running costs of electronic still cameras and copy images containing text instead of converting them into memos.

(Object of the Invention) The present invention has been made in view of the above points, and its purpose is to match the resolution of an image played by a recording/playback device with the resolution of an image observed by an optical viewfinder. The objective is to realize an electronic camera device that can

(Structure of the Invention) The present invention that achieves the above object includes: an imaging device that receives optical image information and generates an electrical signal according to the amount of received light;
In an electronic camera device that includes a recording device that processes the output of the imaging device and records it in a storage device, and an optical viewfinder, the imaging device and the recording device are installed inside the optical viewfinder. It is characterized by the provision of an optical low-pass filter that is equivalent to the resolution.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram showing one embodiment of the present invention.

In the figure, the same parts as in FIG. 1 are designated by the same reference numerals. 20 is installed in the optical viewfinder 6,
It is an optical low pass filter. The low pass filter 2
o is arranged between the half mirror 4 and the mirror 5, and the light reflected to the outside from the mirror 5 is that which has passed through the optical low-pass filter 20. Therefore, the image transmitted through the optical low-pass filter 20 can be seen through the finder. As shown in the figure, this optical low-pass filter 20 has a structure in which a horizontal filter and a vertical filter are overlapped.

The one in the horizontal direction has filter characteristics that match the resolution of the part of the imaging system and recording/playback system that has the lowest resolution. On the other hand, the vertical type has a filter characteristic with a resolution corresponding to the number of scanning lines during field shooting and frame shooting, and this characteristic can be switched depending on the case of each scanning line. It has become. The stacking order of such two-layer optical low-pass filters may be such that either the vertical or horizontal layer is placed on the upper side. In other words, the order may be arbitrary.

According to the apparatus of the present invention configured in this manner, the resolution of the image reproduced via the imaging system and the recording/reproducing system can be matched with the resolution of the image observed through the optical viewfinder 6. Therefore, the image you see through the viewfinder is played back as is, so when you take an image that includes text, etc., you can check the resolution of the recorded and played image by looking through the viewfinder. can. According to the device of the present invention, it is possible to take an image containing text instead of making a memo, and unlike the conventional device, there is the problem that a character that is recognized by looking through the viewfinder cannot be identified in the recorded and played back image. do not have. According to the present invention, necessary information can always be recorded with desired clarity. Furthermore, by using the device of the present invention, if you look through the viewfinder at the shooting stage and find that the characters are too small to be read when you record and play them back, you can divide the target image into multiple areas according to each case. It is possible to take close-up photographs of each divided area and to prevent mistakes in photographing.

(Effects of the Invention) As described in detail above, according to the present invention, the imaging system,
By installing a low-pass filter in the optical viewfinder that matches the resolution of the recording and playback system, the resolution of the image played back by the recording and playback device can be made to match the resolution of the image observed with the optical viewfinder. This eliminates photographic errors and has an extremely large practical effect.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a conventional example of an electronic camera device, and FIG. 2 is a layout diagram showing an embodiment of the present invention. 1.2...Lens 3...Aperture 4...Half mirror 5...Mirror 6...Optical viewfinder 7.20...Optical low-pass filter 8...Imaging device 9...・Signal processing circuit 10...recording device @ 11・
...Storage device patent applicant Roku Konishi Photo Industry Co., Ltd. Representative Patent attorney Fuji Ijima 1 person

Claims (4)

[Claims] (1) Consists of an imaging device that receives optical image information and generates an electrical signal according to the amount of light received, a recording device that processes the output of the imaging device and records it in a storage device, and an optical viewfinder. An electronic camera device according to claim 1, characterized in that an optical low-pass filter having a resolution equivalent to that of the imaging device and the recording device is provided inside the optical viewfinder. (2) The electronic camera device according to claim 1, wherein a solid-state image sensor is used as the image pickup device. (3) The electronic camera device according to claim 2, characterized in that C and CD are used as the solid-state image pickup device. (4) The electronic camera device according to claim 2, wherein a MOS type solid-state image sensor or CPD is used as the solid-state M image element.