Image pickup apparatus, method of controlling the image pickup apparatus, and external device

• US 7,586,516 B2
• Filed: 01/28/2005
• Issued: 09/08/2009
• Est. Priority Date: 10/19/2000
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Koide, Yuji
• Primary Examiner(s): VU, NGOC YEN T
• Application Number:
  US11/044,300
• Publication Number:
  US 20050128321A1
• Time in Patent Office: 1,684 Days
• Field of Search: 348/231.99, 348/207.1, 348/207.2, 348/207.11
• US Class Current: 348/207.1
• CPC Class Codes: H04N 5/77 between a recording apparatus and a television camera
• CPC Class Codes: H04N 5/772 the recording apparatus and the television camera being placed in the same enclosure
• CPC Class Codes: H04N 5/907 using static stores, e.g. storage tubes or semiconductor memories H04N5/91 takes precedence
• CPC Class Codes: H04N 9/8042 involving data reduction

Abstract

An image pickup apparatus which records a digital image signal by taking a picture of an object and which transfers the recorded digital image signal to an external device. The apparatus includes a buffer memory, an image saving memory, an image memory accumulation state judgment unit, and a transfer unit. The buffer memory is adapted to temporarily accumulate the digital image signal obtained by picture taking. The image saving memory is adapted to save the digital image signal. The image memory accumulation state judgment unit is adapted to judge whether or not a new digital image signal can be accumulated in the buffer memory. The transfer unit is adapted to transfer to the external device the digital image signal accumulated in the buffer memory if the image memory accumulation state judgment unit determines that any new digital image signal cannot be accumulated in the buffer memory.

Claims

1. An image pickup apparatus which records a digital image signal by taking a picture of an object and transfers the recorded digital image signal to an external device, the apparatus comprising:

an image memory unit configured to temporarily store the digital image signal obtained by picture taking;

a photography preparation state determining unit configured to determine whether or not said image pickup apparatus is in a photography preparation state;

a photography running state determining unit configured to determine whether or not said image pickup apparatus is in a photography running state;

an image memory accumulation state determining unit configured to determine whether or not a new digital image signal can be accumulated in said image memory unit;

a transfer unit configured to transmit the digital image signal accumulated in said image memory unit to the external device; and

an image transfer propriety determining unit configured to determine whether or not the digital image signal accumulated in said image memory unit will be transferred to the external device by said transfer unit,

wherein, in a case where during the transfer of the digital image signal by said transfer unit, it is determined that said image pickup apparatus is in the photography preparation state or in the photography running state, said image transfer propriety determining unit determines whether or not to continue the transfer of the digital image signal by said transfer unit, on the basis of the determination of said image memory accumulation state determining unit, and

in a case where during the transfer of the digital image signal by said transfer unit, it is determined that said image pickup apparatus is neither in the photography preparation state nor in the photography running state, said image transfer propriety determining unit determines whether or not to continue the transfer of the digital image signal by said transfer unit, irrespective of the determination of said image memory accumulation state determining unit.

2. An image pickup apparatus according to claim 1, wherein, in a case where it is determined that said image pickup apparatus is in the photography preparation state or in the photography running state and said image memory accumulation state determining unit determines that the new digital image signal cannot be accumulated in said image memory unit, said image transfer propriety determining unit determines that the digital image signal accumulated in said image memory unit will be transferred to the external device.

3. An image pickup apparatus according to claim 2, wherein in a, case where it is determined that said image pickup apparatus is in the photography preparation state or in the photography running state and said image memory accumulation state determining unit determines that the new digital image signal can be accumulated in said image memory unit, said image transfer propriety determining unit determines that the digital image signal accumulated in said image memory unit will not be transferred to the external device.

4. An image pickup apparatus according to claim 1, wherein said image memory unit is controlled so that the accumulated digital image signal is erased or can be overwritten after transfer of the digital image signal by said transfer unit.

5. An image pickup apparatus according to claim 1, further comprising a recording medium configured to record the digital image signal accumulated in said image memory unit.

6. An image pickup apparatus according to claim 5, wherein said recording medium is detachably connected to said image pickup apparatus.

7. An image pickup apparatus according to claim 5, further comprising a memory management unit configured to recognize a usable remaining capacity of said recording medium,

wherein, if said memory management unit recognizes that the remaining capacity has become smaller than a predetermined storage capacity, switching is performed from a mode in which the digital image signal transferred by said transfer unit is erased from said image memory unit or overwriting of the digital image signal is enabled to a mode in which the digital image signal transferred by said transfer unit is erased from both said image memory unit and said recording medium or overwriting of the digital image signal is enabled in both said image memory unit and said recording medium.

8. A control method for an image pickup apparatus which records a digital image signal by taking a picture of an object and transfers the recorded digital image signal to an external device, said method comprising:

a storing step of temporarily storing, in an image memory unit, the digital image signal obtained by picture taking;

a photography preparation state determining step for determining whether or not the image pickup apparatus is in a photography preparation state;

a photography running state determining step for determining whether or not the image pickup apparatus is in a photography running state;

an image memory accumulation state determining step for determining whether or not a new digital image signal can be accumulated in the image memory unit;

a transferring step for transmitting the digital image signal accumulated in the image memory unit to the external device; and

an image transfer propriety determining step for determining whether or not the digital image signal accumulated in the image memory unit will be transferred to the external device

wherein, in a case where during said transferring step said photography preparation state determining step determines that the image pickup apparatus is in the photography preparation state or said photography running state determining step determines that the image pickup apparatus is in the photography running state, said image transfer propriety determining step determines whether or not to continue the transferring performed in said transferring step, on the basis of the determination of said image memory accumulation state determining step, and

in a case where during said transferring step it is determined that the image pickup apparatus is neither in the photography preparation state nor in the photography running state, said image transfer propriety determining step determines whether or not to continue the transferring performed in said transferring step, irrespective of the determination of said image memory accumulation state determining step.

9. A control method according to claim 8, wherein, in a case where it is determined that the image pickup apparatus is in the photography preparation state or in the photography running state and said image memory accumulation state determining step determines that the new digital image signal can not be accumulated in the image memory unit, said image transfer propriety determining step determines that the digital image signal accumulated in the image memory unit will be transferred to the external device.

10. A control method according to claim 8, wherein, in a case where it is determined that the image pickup apparatus is in the photography preparation state or in the photography running state and said image memory accumulation state determining step determines that the new digital image signal can be accumulated in the image memory unit, said image transfer propriety determining step determines that the digital image signal accumulated in the image memory unit will not be transferred to the external device.

11. A control method according to claim 8, wherein the image memory unit is controlled so that the accumulated digital image signal is erased or can be overwritten after transfer of the digital image signal by said transferring step.

12. A control method according to claim 8, further comprising a recording medium providing step of providing a recording medium configured to record the digital image signal accumulated in the image memory unit.

13. A control method according to claim 12, wherein the recording medium is detachably connected to the image pickup apparatus.

14. A control method according to claim 12, further comprising a memory management step of recognizing a usable remaining capacity of the recording medium,

wherein, if the memory management step recognizes that the remaining capacity has become smaller than a predetermined storage capacity, switching is performed from a mode in which the digital image signal transferred by said transferring step is erased from the image memory unit or overwriting of the signal is enabled to a mode in which the digital image signal transferred by said transferring step is erased from both the image memory unit and the recording medium or overwriting of the signal is enabled in both the image memory unit and the recording medium.