JP2007088592A - Video imaging and recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display moving picture data normally and continuously independently of a mount form of a receiving end apparatus. <P>SOLUTION: There is provided a means, whereby a user can easily recognize that a digital video camera is in a stopped state even if a moving picture reproducing means is in a stopped state, when the digital video camera including a moving picture reproducing means is connected to a second apparatus via a digital interface to perform moving picture streaming with a VCR. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a moving image and still image transmission method in a case where a video imaging and recording apparatus such as a digital video camera having a digital interface can be connected to a PC, a digital TV or the like through a digital interface meeting.

  At present, digital video cameras and digital still cameras have digital interfaces such as USB (Universal Serial Bus Protocol) Interface and IEEE1394, and video and still image data recorded and recorded can be externally connected via a digital interface. It can be transferred to the device. On the other hand, it is also possible to transmit video and still image data recorded on a video from a camera, tape media, card media, etc. in real time to an external device connected via a digital interface. It is also possible to control the VTR function in response to a request from an external device connected via a digital interface, and transmit moving image data from a tape to the external device. FIG. 1 shows a state in which a digital video camera (103) and a PC (101) are connected via a USB digital interface (102). In the USB standard, when moving images are transferred using ISOCHRONOUS transfer, transfer of moving image data is started in response to a SET_INTERFACE standard request from the PC (101).

As a conventional example, for example, Patent Document 1 can be cited.
JP 2001-298676 A

  However, for example, when the video recorded in the tape from the digital video camera (103) is transmitted to the PC (101) via the USB digital interface (102) and displayed on the PC (101), First, the PC (101) transmits a control command for playing back a tape to the digital video camera (103), and then starts moving image stream transfer by SET_INTERFACE. At this time, the control command for playing the tape is not sent to the digital video camera (103), and even if only SET_INTERACE is sent and the video stream is started, the VTR function is in a stopped state, so the tape media Video data is not transferred. At this time, since data is not received in the PC (101), a buffer underrun may occur. In order to prevent buffer underrun, when the last frame of the already received video data is displayed continuously, for example, the video at the position where the VTR function of the digital video camera is stopped in the pause state is continuously sent. Since it does not change from the state, the user cannot distinguish between the paused state and the stopped state simply by viewing the video.

  Therefore, in the present invention, the VTR function for controlling the tape media is stopped when the moving image data recorded on the tape media is transmitted to an external device via the digital interface (the tape is played back). When the video stream transfer request is received from an external device, the video data that can be easily understood by the user that the VTR is in a stopped state is continuously transmitted, so that the buffer underrun at the receiving side Avoid run and user confusion.

  According to the present invention, it is possible to continue to display moving image data normally regardless of the mounting form of the receiving device, and avoid user confusion.

  FIG. 2 is a block diagram of a digital video camera as an embodiment to which the present invention is applied. In the digital video camera (200) of this embodiment, at the time of recording, the imaging control unit (201) controls the imaging device (208) to take a picture of a subject and a still image, and the imaging device (208). The captured video and still image data is compressed into an appropriate video and still image format by the image processing unit (205), and the compressed data is transferred to the removable recording unit (209) by the recording control unit (204). Is done. On the other hand, during playback, the video and still images recorded in the removable recording unit (209) are read out by the playback control unit (203) and decompressed according to the appropriate video and still image format by the image processing unit (205). The decompressed data is transferred to the display unit (210) and displayed. When an external device is connected to the digital interface (207), the video and still image data compressed by the image processing unit (205) by the DIF control unit (206) are transmitted via the digital interface (207). Is output. The digital interface is USB-IF or IEEE1394. Each control unit is connected by a data / address bus (220), data transfer is performed via this bus, and the main control unit (202) controls each control unit.

  Further, in the digital video camera (103) in the present embodiment, in the camera mode, the moving image and still image data captured from the image sensor (208) are recorded on the removable recording unit (209), displayed, and the digital interface (207 ) Can be sent to the outside via VCR mode, and data can be read out from the removable recording unit (209), played back, and sent to the outside via the digital interface (207) in the VTR mode. is there.

  For the sake of explanation, the internal configuration of the digital video camera 103 shown in FIG. 1 is shown by 202 in FIG. 2. As shown in FIG. 1, the digital video camera equipped with the function of the present invention is a PC. It is assumed that it is connected to (101). It is assumed that the digital video camera (103) and the PC (101) are connected by a USB (102), and the PC (101) recognizes the digital video camera (103) by a USB standard protocol.

  Next, when the digital video camera (103) is operating in the VTR mode and moving image data is transferred to the removable recording unit (209) by USB isochronous transfer in response to a request from the PC (101). The process according to the invention is illustrated using the flowchart of FIG.

  In step 301, when the digital video camera (103) receives a SET_INTERFACE request which is a moving image transfer request from the PC, the process proceeds to step 302. If the VTR function is in the playback state in step 302, the process proceeds to the transfer data acquisition process in step 303. If the VTR function is in the stop state, the process proceeds to the transfer blueback data acquisition process in step 304. Here, the playback state of the VTR function is a state in which images such as slow playback, frame-by-frame playback, fast-forward playback, and pause can be displayed. At this time, in the digital video camera (103), first, the playback control unit (203) compresses the data taken from the removable recording unit (209) by the image processing unit (205) into an appropriate specified format, for example, Motion JPEG. And expands to the internal memory (211). FIG. 4 shows the state of the moving image data developed in the internal memory (211). The moving image data is arranged in order for each frame (401). At this time, the position of the latest moving image frame transferred to the image processing unit (205) on the internal memory (211) is held by the CUR_PTR (403). Similarly, a value indicating the size of each frame is also held in a form corresponding to the memory configuration of FIG. The moving image data of each frame is read by the DIF control unit (206) and output to the digital interface (207). When the transfer for one frame is completed, the SND_PTR (402) indicating the position of the current transfer data on the internal memory (211) is moved to the position of the frame data to be transferred next, and the DIF control unit (206) In response to the SND_PTR (402), the next frame moving image data is transferred. Since the transfer of the moving image data to the external interface and the capture period of the image data from the removable recording unit are synchronized, it is assumed that there is always a difference of one frame between SND_PTR (402) and CUR_PTR (403). Here, a buffer having a predetermined capacity is reserved for moving image data transfer on the internal memory (211), and the buffer for arranging each frame operates as a ring buffer. That is, in step 303, SND_PTR which is the head address of a buffer in which moving image data for one frame to be transferred is stored is acquired. On the other hand, in step 304, an address on the internal memory (211) in which blue back data is arranged in advance so that the user can easily understand that the VTR is stopped is acquired. Thereafter, in step 305, the main control unit (202) performs division into a predetermined size by adding a header or the like from the acquired moving image data for one frame according to the size of the packet transferred on the digital interface. The packet is held in the internal memory (211). Thereafter, the packet generated in step 306 is transmitted by the DIF control unit (206). In step 307, if a transmission stop request is received from the PC (101), the process proceeds to the beginning of the flowchart processing of FIG. 3, and if not received, transmission of one frame of video data is completed in step 308. If it has been completed, the process proceeds to step 302, where one frame of video data to be transmitted next is prepared, and if transmission has not been completed, the packet to be transmitted next is determined. It is generated in step 305.

[Industrial applicability]
The present invention is effective in the case of connecting to a network via a digital video camera or a digital interface and playing back a VTR moving image.

Example of digital interface connection between a digital video camera equipped with the functions of the present invention and a PC Block diagram of a digital video camera equipped with the functions of the present invention The flowchart which showed the processing procedure of this invention Configuration example of internal memory for holding video data used in the embodiment

Claims (1)

  A first electronic device having a digital interface connected to a second electronic device, having main control means for controlling the first electronic device, and recording moving images, still images, and audio Detachable recording means that can be held, and also has playback control means that can read and reproduce still images and moving images from the detachable recording means, and the second interface via the digital interface. Communication control means capable of communicating with the other electronic device, and the first electronic device responds to a request from the second electronic device, the moving image held in the removable recording unit, It is possible to reproduce the image and sound by the reproducing means and transmit them via the digital interface, and even if the reproduction is not performed by the reproducing means, the first electronic device Recording means And controlling the interface to transmit temporary moving image data held in the internal recording means different from the moving image data being transferred to the second electronic device via the communication control means Method.

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