2.8 Understanding How the Camera Manages Buffered Images
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
13.3 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)
|
250
|
125
|
80
|
60
|
50
|
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 sensor 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 sensor 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”)
|
250
|
125
|
80
|
60
|
50
|
|
Recommended maximum number of pre-trigger images (“B”)
|
80
|
40
|
20
|
20
|
10
|
|
Recommended maximum number of post-trigger images (when the number of pre-trigger images shown above is set) (“C”)
|
90
|
40
|
40
|
20
|
30
|
|
Approximate number of images buffered when using the above settings (“D”)
|
170
|
85
|
60
|
40
|
40
|
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.