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Relative exposure intensity measuring apparatus and method

A technology for output devices and objects, applied to TVs, color TV parts, electrical components, etc., can solve the problems of wide measurement range, low measurement accuracy, and the inability of exposure meters to calculate relative exposure

Active Publication Date: 2009-04-01
LEADER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the measurement angle 5 of the illuminometer 3 is about 1 degree, and as a result, the measurement range is wide (the measurement accuracy is low).
[0007] The exposure meter disclosed in Patent Document 1 calculates the exposure amount based on the standard exposure amount, so the exposure meter cannot calculate the relative exposure amount based on any point of the subject.
In addition, for the purpose of grasping the area (11) out of latitude (latitude), the exposure meter displays the comparative value (+1EV, +1EV, + 2EV, -1EV, -2EV, etc.) (low measurement accuracy)
[0008] Furthermore, light meters or light meters separate from video or still cameras contain inherent manufacturing errors

Method used

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  • Relative exposure intensity measuring apparatus and method
  • Relative exposure intensity measuring apparatus and method
  • Relative exposure intensity measuring apparatus and method

Examples

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Embodiment Construction

[0031] image 3 Shows an example of how a movie or TV is shot with a video camera according to the present invention. An object 31 having a predetermined reflectance is prepared on the object 1 photographed by the camera 4 . By preparing an object 31 having a predetermined reflectance, the position of the object 31 can be used as a reference. Preferably, the specified reflectance is 18%. Furthermore, it is preferable that the color of the object 31 is gray. The gray object 31 having a reflectance of 18% is, for example, "uniform density board" available from Fujifilm Corporation. In addition, a gray object 31 having a reflectance of 18% is often used to obtain a brightness reference (standard exposure value) in a movie or television shooting scene. Thus, to obtain a standard exposure value, and for use in the present invention, a gray object 31 with a reflectivity of 18% can be used.

[0032] Fig. 4 shows an outline of a block diagram of the apparatus 30 of the present in...

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Abstract

The method comprises the steps of providing image signal output device (4); inputting a luminance component of image signal corresponding to a first position of object (1) photographed by the image signal output device (4); correcting the gamma-value of the luminance component corresponding to the first position; inputting a luminance component of image signal corresponding to second position (71) of the object (1) photographed by the image signal output device (4); correcting the gamma-value of the luminance component corresponding to the second position; computing the ratio between the luminance component corresponding to the first position after the gamma correction and the luminance component corresponding to the second position after the gamma correction; and displaying the ratio (72).

Description

technical field [0001] The present invention generally relates to an apparatus and method for measuring relative exposure based on image signals. For example, the present invention obtains the luminance (relative luminance) corresponding to the second position based on the luminance corresponding to the first position based on the video signal from the video signal output device, and measures it as relative exposure or relative aperture value. Background technique [0002] Figure 1 shows what it looks like when shooting a movie or TV with a video camera. In order to obtain the brightness of a certain point (position) of the object 1 photographed by the camera 4, conventionally, it was necessary to arrange the illuminance meter 2 near the point. Conventionally, a spot illuminance meter 3 that can be arranged near the camera 4 has been used instead. [0003] Patent Document 1 shown below discloses an exposure meter for a still camera. The exposure meter constitutes a video ...

Claims

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Application Information

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IPC IPC(8): H04N17/00H04N5/235
CPCH04N17/002H04N5/202H04N23/82H04N23/70H04N23/75
Inventor 今村元一常本英治
Owner LEADER ELECTRONICS