1. A method of encoding video data, the method comprising:
generating a first set of data by encoding a first image of the video data; generating one or more further sets of data by predictively encoding the first
image, wherein the predictive encoding is performed with respect to a decoded version of the first image associated with a previously generated set of data;
in response to a user request which selects a further image from said video data, generating a first set of data representing the further image by predictively encoding the further image, wherein the predictive encoding is performed with respect to a decoded version of the first image associated with a previously generated set of data; and
generating one or more further sets of data representing the further image by predictively encoding the further image, wherein the predictive encoding is performed with respect to a decoded version of the further image associated with a previously generated set of data.
2. A method according to claim 1, wherein the first set of data representing the further image is generated by predictive encoding with respect to the decoded version of the first image associated with the immediately preceding generated set of data representing the first image.
3. A method according to claim 1 wherein each further set of data representing an image is generated by predictively encoding that image with respect to a decoded version of an image associated with the immediately preceding generated set of data.
4. A method according to claim 1 wherein images are stored in a buffer for presentation for encoding on request of a user.
5. A method according to claim 1 wherein the request for the further image represents a pre-determined time in the video data before or after the first image.
6. Video encoding apparatus, comprising a predictive encoder arranged:
to encode a first set of data representing a first image;
to encode one or more further sets of data representing the first image by predictively encoding the first image, wherein the predictive encoding is performed with respect to a decoded version of the first image associated with a previously generated set of data;
in response to the apparatus receiving a user request which selects a further image, to encode a first set of data representing the further image by predictively encoding the further image, wherein the predictive encoding is performed with respect to a decoded version of the first image associated with a previously generated set of data; and
to encode one or more further sets of data representing the further image by predictively encoding the further image, wherein the predictive encoding is performed with respect to a decoded version of the further image associated with a previously generated set of data.
7. A video surveillance system comprising:
a video capture device;
a video encoding apparatus according to claim 6 for encoding video signals received from the video capture device;
a user terminal including a video decoding device for decoding video signals received from the video encoding device and a user interface for a user to input commands to be sent to the video encoding device.
8. A video surveillance system according to claim 7 further including a buffer for storing images for presentation for encoding on request of a user.
9. A method of decoding video data, comprising:
receiving a first set of data representing a first image of the video data;
decoding the first set of data to generate a decoded version of a first image;
decoding further received sets of data representing the first image with reference to a previously decoded version of the first image;
sending to a transmitting encoder a user request which selects a further image from the video data;
decoding a received set of data representing the requested further image with reference to a previously decoded version of the first image so as to generate a decoded version of the further image; and
decoding further received sets of data representing the further image with reference to a previously decoded version of the further image.
10. A storage medium carrying computer readable code representing instructions for causing one or more computers to perform the method according to claim 1 when the instructions are executed by the computer or computers.
11. A computer data signal embodied in a carrier wave and representing instructions for causing one or more computers to perform the method according to claim 1 when the instructions are executed by the computer or computers.
12. A storage medium carrying computer readable code representing instructions for causing one or more computers to operate as the apparatus according to claim 6.
13. A computer data signal embodied in a carrier wave and representing instructions for causing one or more computers to operate as the apparatus according to claim 6.
14. A storage medium carrying computer readable code representing instructions for causing one or more computers to operate as the system of claim 7.
15. A computer data signal embodied in a carrier wave and representing instructions for causing one or more computers to operate as the system of claim 7.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. An enclosure securing apparatus comprising:
a handle housing disposed in a cover for an opening in an enclosure;
a handle lever pivotably attached to said handle housing, said handle lever having first and second ends;
a cam surface disposed at said first end of said handle lever for engagement with a lock housing; and
a lock assembly integrated with said enclosure securing apparatus for locking said enclosure.
2. The apparatus of claim 1, wherein said lock assembly further comprises a rotatable shank for engagement with said handle lever.
3. The apparatus of claim 2, wherein said rotatable shank extends through a first hole in said handle lever in a locked position.
4. The apparatus of claim 2, wherein said rotatable shank is attached to a keyed tumbler.
5. The apparatus of claim 1, wherein said handle housing further comprises a handle snap integrated with said handle housing for engagement with said handle lever when said handle lever is in a first position.
6. The apparatus of claim 5, wherein said handle lever further comprises a second hole receptive of said handle snap.
7. The apparatus of claim 1, wherein said handle lever further comprises a detent at said first end for holding said handle lever in a second position.
8. The apparatus of claim 7, wherein said detent engages a wing element of said handle housing for supporting said handle lever in said second position.
9. The apparatus of claim 1, wherein said handle housing and said handle lever comprise molded plastic.
10. The apparatus of claim 1, wherein said lock housing and lock assembly comprise metal.
11. The apparatus of claim 1, wherein said cover comprises a computer housing access panel.
12. A holding mechanism comprising:
a housing; and
a lever arm attached to the housing, the lever arm comprising:
a first surface having first and second edges, wherein said first edge has a first wall extending therefrom, and the second edge has a second wall extending therefrom, said first and second walls extending in the same direction from said first surface; wherein said first and second walls each include a curvilinear surface; and wherein at least one of said curvilinear surfaces includes a protrusion disposed adjacent thereto for holding said lever arm in at least two positions.
13. The mechanism of claim 12, further comprising a lock housing for engagement with said curvilinear surfaces to hold a cover to a chassis.
14. The mechanism of claim 12, wherein the housing further comprises at least one wing element adapted for releasing engagement with said protrusion.
15. The mechanism of claim 14, wherein said protrusion comprises a rounded surface to facilitate movement past said at least one wing element with the application of force to said lever arm.
16. The mechanism of claim 12 further comprising a lock assembly integrated with said holding mechanism for locking said lever arm in a first of said at least two positions.
17. The mechanism of claim 16, wherein said locking mechanism further comprises a shank for engagement with said lever arm.
18. The mechanism of claim 17, wherein said first wall of said lever arm further comprises a hole receptive of said shank for locking said lever arm.
19. The mechanism of claim 12 further comprising a handle snap integrated with said housing for engagement with said lever arm when said handle lever is in a first of said at least two positions.
20. An enclosure securing apparatus comprising:
a handle housing;
a handle lever pivotably attached to said handle housing, said handle lever having first and second ends; and
a handle snap integrated with said handle housing for engagement with said lever arm when said handle lever is in a first position.
21. The apparatus of claim 20, wherein said handle lever further includes a hole therein receptive of said handle snap.
22. The apparatus of claim 20, wherein said handle snap is biased to snappingly engage said handle lever.
23. The apparatus of claim 20, wherein said handle housing and said handle snap comprise a single molded piece.
24. An enclosure securing apparatus comprising:
housing means;
lever means attached said housing means;
locking means integrated with said housing and lever means for locking said lever means in a first position; and
holding means for keeping said lever means in a second position.
25. A method of securing an enclosure to a chassis, wherein the enclosure includes a securing lever arm, comprising: engaging said enclosure with said chassis without holding said lever arm.
26. The method of claim 25 further comprising pivoting said securing lever arm to secure said enclosure to said chassis.
27. The method of claim 25 further comprising snapping a lever snap to said lever arm.
28. The method of claim 26 further comprising locking said lever arm.
29. The method of claim 25, wherein said enclosure comprises a computer housing panel.