JP2753608B2 - camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for recording information at the time of shooting with a camera.

(Background of the Invention) In a silver halide color developing system for obtaining a color print from a photographed color negative film, there are roughly two steps of "film development" and "stretching".

In these processes, various measures have been taken to faithfully reproduce the color tone and contrast of the subject on color prints, but in the case of negatives with excessive or insufficient exposure,
Occasionally, a color print different from the impression when the subject is taken may be created. In particular, in an automatic printing system that creates color prints from a large amount of negative film at once, it is important to efficiently obtain high-quality color prints in a short time, but it is necessary to create color prints with exposure far from the subject. Is often done.

Current color negative and color print systems are designed to reproduce the tone of the subject best when shot with exposure (appropriate exposure) according to the film's inherent sensitivity. Due to the characteristics, even if the exposure slightly deviates from the appropriate exposure amount, a print that can sufficiently withstand practical use can be obtained by correcting during the "stretching" step of the developing laboratory.

(Problems to be solved by the invention) However, even with a highly automated printing system,
In an overexposed negative or the like, it is often not completely corrected. For this reason, in a photo lab, a skilled worker looks at the color negative immediately before stretching one frame at a time and corrects the printing exposure amount specified by the measuring machine according to the situation of the shooting scene, or visually inspects the completed color print. Work is being done to re-create poor quality prints.

(Object of the Invention) The present invention has been made in view of such a conventional problem, and when the brightness of an object scene exceeds the exposure interlocking control range of a camera at the time of shooting, an image is output from a photometric unit. Provide a camera that detects and records an exposure error between the photometric value measured and the exposure amount that is actually exposure-controlled, and feeds this information back to the “stretching” process in a photo lab to produce a negative for this scene. The objective of the present invention is to quantitatively convey how much overexposure or underexposure is caused by an appropriate exposure amount, perform burn-in correction suitable for the scene, improve the reproducibility of color printing, and achieve efficient finishing.

(Means for Solving the Problems) The present invention is directed to a photometric unit for measuring the brightness of an object scene; a control operation unit for determining an exposure control value based on a photometric output of the photometric unit; A difference detecting means for detecting a difference between the output of the control value calculating means and the output of the control value calculating means, and outputting information on the difference; and an information recording means for recording an output of the difference detecting means. The main point.

(Embodiment) FIG. 1 is a diagram showing an embodiment of the present invention. In FIG. 1, a photometric means 10 measures a luminance value (BV) of a scene,
The light value (LV) together with the film sensitivity value (SV) [where LV =
BV + SV]. The photometric output 10 outputs the light value (LV) to the control value calculating means 30 and the difference detecting means 40, respectively.

The control value calculating means 30 controls a range controllable by the aperture and shutter mechanism of the exposure means 20, that is, an exposure interlocking control range limited by a controllable range of an aperture value (aperture value: AV) and a shutter time value (TV). Then, a control value (EV) suitable for the light value (LV) is output to the exposure means 20 and the difference detection means 40. Exposure means 20 performs exposure on the film by operating the aperture and the shutter mechanism according to the control value.

On the other hand, the difference detection means 40 detects a difference between the control value (EV) output from the control value calculation means 30 and the light value (LV) output from the photometry means 10, that is, an exposure error (δ), Output to the information recording unit 50 (δ = LV−EV).

The information recording unit 50 stores the exposure amount error (δ) in the information storage unit 60.
Record to. Here, if the light value (LV) is within the exposure interlocking control range, the light value (LV) is equal to the control value (EV), the film is properly exposed, and the exposure error δ =
0 is recorded. On the other hand, when the light value (LV) is out of the exposure interlocking control range, the light value (LV) and the control value (EV) become unequal, and exposure with excess or deficiency is performed. Is recorded as.

As a recording method in the information storage unit 60, for example, a part outside the shooting screen of the film, a method of optically copying information as the information storage unit 60, or providing a magnetic tape outside the shooting screen,
There is a method of magnetically recording information as the information storage unit 60, a method of incorporating an EPROM in a film cassette or the like, and electrically writing information as the information storage unit 60, and the like.

(Effects of the Invention) As described above, according to the present invention, by detecting the exposure error (δ) for each frame and providing a camera for recording the information, it is possible to perform the “stretching” process at the developing station. Where 1
By automatically checking the exposure error (δ) for each frame by a machine, it is possible to quantitatively determine how much the exposure of the frame deviates from the proper exposure. Then, in the "stretching" process, by automatically performing the printing degree correction suitable for the frame, it is possible to efficiently create a print with good reproducibility.

For example, (1) When the user wants to use the aperture open but wants to use a high-sensitivity film and the exposure time is too long even when the highest speed shutter is used (when the time value TV falls outside the exposure interlocking control range).

(2) When it is desired to use a high-speed shutter to stop the movement of the subject in a dark place, but the brightness is insufficient even when the aperture is wide open (when the aperture value AV is out of the exposure interlocking control range).

For example, even if the exposure is excessive or deficient in the negative, the photographing is performed for the time being, and the printing degree correction is performed based on the exposure amount error (δ), thereby enabling quantitative printing degree management. Prints with good reproducibility can be efficiently created.

In addition, in a photograph having a large difference in luminance, for example, a backlit picture in which a person appears small in a white background, the white background is exposed when a conventional camera is used, so that the person is underexposed. Therefore, the photographer intentionally corrects the exposure to the over side (to make the person appropriate). However, if the correction amount is extremely large, the white background occupies the majority and a dark negative is formed. I will. Such a negative may be judged as an exposure mistake negative in a “stretching process” of a developing laboratory and may not be printed. Here, if the exposure error (δ) is recorded, it can be determined that this frame is intentionally photographed by δ and is not due to an exposure error, and is excluded from the “stretching process”. Without this, appropriate printing degree correction is performed, and a good print can be obtained.

Also, by storing the exposure error (δ) as it is without any processing, the exposure error (δ) can be stored in the camera as it is (for example, by correcting the exposure error in the camera during the “stretching process” unique to the camera). For example, even if the film has the same sensitivity, each company has its own characteristics, so even when correcting the burnout in the "stretching process" on the lab side, the optimum burnout correction for each company The amount can be easily set as the optimal shape for the equipment used in the laboratory.

[Brief description of the drawings]

 FIG. 1 is a block diagram showing an embodiment of the present invention. (Description of Signs of Main Parts) 10 Photometric Means 20 Exposure Means 30 Control Value Calculation Means 40 Error Detection Means 50 Information Recording Means 60 Information Storage Unit

Continued on the front page (72) Inventor Toshihiro Sato 1-6-3 Nishioi, Shinagawa-ku, Tokyo Nikon Oi Works Co., Ltd. (72) Inventor Toru Fukuhara 1-6-3 Nishioi, Shinagawa-ku, Tokyo Japan Nikon Oi Works (56) References JP 6-10718 (JP, B2)

Claims (1)

(57) [Claims] A photometer for measuring the brightness of an object scene; a control calculator for determining an exposure control value based on a photometric output of the photometer; an output of the photometer; and the control value calculator. A camera comprising: a difference detection unit that detects a difference from an output of the difference detection unit and outputs information on the difference; and an information recording unit that records an output of the difference detection unit.