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JPEG file from VN-V25/26 is JFIF compliant and consist of the following.
FFD8
Start Code
FFE0
Application Segment
FFFE
Comment Segment 1
FFFE
Comment Segment 2 (reserved)
FFC4
DHT Huffman Table
FFDB
DQT Quantization Table
FFDD
DRI Restart Interval
FFC0
SOF Frame Information
FFDA
Data Start Segment
FFD9
End Code
The following information is stored in the comment segment 1. Each item has a fixed length.
Item Size Example Note
Version Information
9 JVC V1.0
Indicates the version of information stored in the comment
segment.
File Size
18 size = 123456
Indicates JPEG size in bytes.
Width
13 width = 640
Width of JPEG.
Height
14 height = 480
Height of JPEG.
Model Name
18 type = VN-V25U
Name of model that created the JPEG.
(reserved) 12 reverse = 0 (reserved)
Time Stamp
70 timestamp =
20071014130509123
UTC
Indicates the time when the JPEG is created. This is made
up of the year/month/day, hour/minute/second, millisecond
and timezone code.
(reserved) 13 alarm = 00000000 (reserved)
Camera ID
50 camera = input01
Stores camera information set at VN-V25/26.
Motion Detect Setting
11 motion = 1
Specified as 1 when the motion detect is ON.
Motion Detect Result
7 md = 1
Specified as 1 if motion is detected at the time when JPEG
is created.
Number of Bytes of
Following Motion
Detect Items
18 motion_size = 10 Indicates size of "motion_bit" and "md_bit" items in
bytes.
Mask Settings for
Motion Detect
24 motion_bit =
00000000000000000
000
Indicates Mask settings for 80 blocks in binary data.
(Not ASCII code.) If the bit is 0, the block is masked. If the
bit is 1, the block is not masked.
Motion Detect
Result of Each Block
20 md_bit =
00000000000000000
000
Indicates motion detect results for 80 blocks in
binary data. (Not ASCII code.) If the bit is 0, the block
detected motion. If the bit is 1, the block did not detect
motion.
8