JP2011119854A - Imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To overcome the problem with a conventional imaging device, wherein, when continuously played back at a certain frame rate, video imaged at a plurality of frame rates, field angle change rates due to zooming in the respective scenes are resultantly different from one another, and the video is difficult to view. <P>SOLUTION: Based on a control signal from a control microcomputer 8 in accordance with a set frame rate, the zoom speed is variably controlled by movably controlling the position of a zoom lens 2 by a lens driver 3, and the field angle change rate between frames are made constant, making the video in playback easier to see. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an imaging apparatus using a lens driving device including a mechanism for performing a zoom operation on a subject imaged by an imaging element whose frame rate can be controlled.

  In recent years, in imaging devices such as digital video and digital cameras, multi-functionalization of imaging devices to which various functions such as high frame rate shooting are added has progressed. In addition to expanding functions, it has become important to design an imaging apparatus that can capture a subject more clearly and optimally.

  FIG. 3 is a block diagram showing an internal configuration of the imaging apparatus. As illustrated in FIG. 3, the imaging apparatus 100 includes a lens 21, an imaging element 22, a camera signal processing unit 23, a monitor 24, a recorder 25, a power supply circuit 26, an image conversion circuit 27, a control microcomputer 28, and operation keys 29. As a principle of the image pickup apparatus, the light that has passed through the lens 21 is converted into an electric signal by the image pickup element 22 and is digitally processed by the camera signal processing unit 23. The image is recorded on the recorder 25 and displayed on the monitor 24. The photographer operates the operation key 29 while confirming the image displayed on the monitor 24. Data indicating the operation content of the operation key 29 is broken down to a command indicating a specific processing content by the control microcomputer 28 and then supplied to each unit.

  Conventionally, as disclosed in Patent Document 1, even when the amount of image data per unit time greatly changes due to a change in frame rate, an image recording apparatus capable of recording image data without significantly degrading image quality An example that provides is disclosed.

JP 2008-252512 A

  However, the above conventional example has the following problems.

  When videos shot at a plurality of frame rates are continuously played back at a fixed frame rate, there is a problem that the angle of view change rate due to zooming differs in each scene, making it difficult to see the videos.

  Therefore, in view of the above situation, the present invention provides an imaging device that makes it easy to see a video during reproduction by making the rate of change in angle of view between frames constant.

  The image pickup apparatus of the present invention is characterized in that an image pickup apparatus having a setting means for setting a frame rate has a mode for automatically and variably selecting the moving speed of the zoom lens according to the set value of the frame rate.

  Another feature of the present invention is that an image captured at a different frame rate is reproduced with a constant angle of view change rate at any frame rate during reproduction.

  As described above, the image pickup apparatus according to the present invention has an effect that the video taken at different frame rates has a constant angle of view change rate, so that the video taken at the time of reproduction is easy to see.

1 is a block diagram illustrating an internal configuration of an imaging apparatus according to an embodiment of the present invention. It is a figure which shows the relationship between a frame rate and a view angle change rate. It is a block diagram which shows the internal structure of the conventional imaging device.

(Example)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an internal configuration of an imaging apparatus according to an embodiment of the present invention.

  The imaging apparatus 10 according to the present invention includes a lens driver 3 that is a zoom lens driving unit that moves the position of the zoom lens 2 by operating the zoom switch 9, and a frame rate that is set by operating the frame rate setting switch 12. And a control microcomputer 8 that is a control means for controlling the lens driver 3 so as to variably control the moving speed of the zoom lens 2 in accordance with the frame rate detected by the frame rate detector 6.

  Further, as shown in FIG. 1, an imaging device 10 according to the present invention includes an imaging element 4 that is an imaging unit that converts light from a subject into a pixel signal via a zoom lens 2 inside the lens block unit 1. The camera signal processing unit 5 is a signal processing unit that processes the pixel signal from the image pickup device 4 and outputs a video signal, a recorder 7 that records an image, and a display unit 11 that displays the image.

  Next, the operation of the imaging apparatus in FIG. 1 will be described.

  In the imaging apparatus 10 of FIG. 1, a zoom instruction signal is input from the zoom switch 9 to the lens driving circuit 8 during a zoom operation when imaging a subject. In the lens driving circuit 8, when the zoom instruction signal is input, the movement amount of the zoom lens 2 is generated so as to control the movement speed of the zoom lens 2 according to the frame rate detected by the frame rate detector 6. Is done. The amount of movement of the zoom lens 2 is sent to the lens driver 3.

  Here, the moving speed of the zoom lens 2 so-called zoom speed is set for each set value of the frame rate so that the rate of change in the angle of view is constant during reproduction, and the zoom lens 2 is driven at the set zoom speed. The amount of movement of the zoom lens 2 is generated.

  Here, FIG. 2 is a diagram showing the relationship between the frame rate and the angle of view change rate.

  As shown in FIG. 2, in the present invention, when the angle of view change rate when shooting at a normal frame rate (60 fps) is X, the view angle change rate when shooting at 120 fps is 2X and shot at 180 fps. The amount of movement of the zoom lens 2 is generated so that the angle of view change rate at that time is 3X.

  Here, at the time of playback, captured images are displayed on the display unit 11, and when images captured at a plurality of frame rates are continuously played back at a constant frame rate, the angle of view change rate due to zoom is constant in each scene. Become.

  In general, the imaging apparatus is equipped with an audio input device, but there is a case where audio output is not performed during slow playback, and the imaging apparatus according to the present invention can also prohibit audio input during high frame rate shooting. It has a configuration like this.

DESCRIPTION OF SYMBOLS 1 Lens block part 2 Zoom lens 3 Lens driver 4 Image pick-up element 5 Camera signal processing part 6 Frame rate detector 7 Recorder 8 Control microcomputer 9 Zoom switch 10 Imaging device 11 Display part 12 Frame rate setting switch 100 Imaging device 21 Lens 22 Imaging Element 23 Camera signal processing unit 24 Monitor 25 Recorder 26 Power supply 27 Image conversion circuit 28 Control microcomputer 29 Operation key

Claims (2)

  An image pickup apparatus having a setting unit for setting a frame rate, wherein the image pickup apparatus has a mode for automatically and variably selecting a moving speed of a zoom lens according to a set value of a frame rate.   The imaging apparatus according to claim 1, wherein an image captured at a different frame rate is reproduced with a constant angle of view change rate at any frame rate during reproduction.