When images are buffered in the camera’s internal memory
The camera’s internal memory is divided between the number of triggers that are configured. For example, if 5 triggers are set, each trigger can use 1/5 of the camera’s internal memory, and if 3 triggers are set, each trigger can use 1/3 of the camera’s internal memory, etc. See
14.3 Internal Memory Capacity for Buffered Images for information about the camera’s internal memory capacity.
For example, when buffering JPEG images at 320 × 240 resolution and standard quality:
|
Number of triggers
|
1
|
2
|
3
|
4
|
5
|
|
Maximum number of JPEG images that can be buffered by each trigger (approximate)
|
970
|
480
|
320
|
240
|
190
|
When you change settings for a trigger, all images buffered in the internal memory for the selected trigger are deleted. Additionally, images buffered for other triggers may also be deleted. When configuring a trigger to buffer or transfer images, it is important to understand how the camera manages buffered images.
All images for the selected trigger are deleted when:
–
You change the settings for a trigger (image buffer frequency, transfer method, transfer settings, etc.)
–
You click [Delete Buffered Images] on the trigger page
All images for all triggers are deleted when:
When selecting [No Transfer, Memory Overwrite] for buffering JPEG images using alarm or motion detection triggers
If you want to configure the camera to buffer pre-trigger and post-trigger images, please note the following recommended settings when selecting [No Transfer, Memory Overwrite] for buffering JPEG images using alarm or motion detection triggers.
When buffering JPEG images at 320 × 240 resolution and standard quality:
|
Number of triggers
|
1
|
2
|
3
|
4
|
5
|
|
Maximum number of JPEG images that can be buffered by each trigger (approximate) (“A”)
|
970
|
480
|
320
|
240
|
190
|
|
Recommended maximum number of pre-trigger images (“B”)
|
300
|
160
|
100
|
80
|
60
|
|
Recommended maximum number of post-trigger images (when the number of pre-trigger images shown above is set) (“C”)
|
370
|
160
|
120
|
80
|
70
|
|
Approximate number of images buffered when using the above settings (“D”)
|
670
|
320
|
220
|
160
|
130
|
Note
•
As a general guideline, the recommended maximum number of pre-trigger images is about 1/3 of the maximum number of images that can be buffered by the trigger.
(“B” equals or is less than “A”×1/3, as shown above).
•
As a general guideline, the number of post-trigger images should not exceed the total number of images that can be buffered by the trigger minus 2 times the number of pre-trigger images.
(“C” equals or is less than “A”-(2דB”), as shown above).
•
Note that when using the above settings, the actual number of images buffered (“D”) is less than the maximum number of images that can be buffered by the trigger (“A”).
•
If the value set for post-trigger images is set too high, pre-trigger images may be overwritten.
•
If the value set for pre-trigger images is set too high, images may not be buffered as expected.
When images are buffered to an SD memory card
SD memory card is divided between the number of triggers that are configured. For example, if 5 triggers are set, each trigger can use 1/5 of SD memory card, and if 3 triggers are set, each trigger can use 1/3 of SD memory card, etc. See
14.4 SD Memory Card Capacity for Buffered Images for information about an SD memory capacity.
All images for the selected trigger are deleted when:
–
You click [Delete Buffered Images] on the trigger page
–
You change the image format (JPEG or MPEG-4) setting on the trigger page
All images for all triggers are deleted when: