JPEG2000 Stand alone DVR User Guide

4.[RESOLUTION]

By lowering the resolution, the DVR gains the recording speed but the recorded pictures becom smaller.

 

Video system

Full Mode

Dual Mode

Quad Mode

 

 

 

 

 

4CH

NTSC

60IPS@720*240

120IPS@360*240

240IPS@360*120

PAL

50IPS@720*288

100IPS@360*288

200IPS@360*144

 

 

 

 

 

 

8CH

NTSC

120IPS@720*240

240IPS@360*240

480IPS@360*120

PAL

100IPS@720*288

200IPS@360*288

400IPS@360*144

 

 

 

 

 

 

16CH

NTSC

120IPS@720*240

240IPS@360*240

480IPS@360*120

PAL

100IPS@720*288

200IPS@360*288

400IPS@360*144

 

 

 

 

 

 

IPS is refered to field per second.

1.Changing the RESOLUTION will NOT change the recording time on DVR.

2.To change the DVR’s recording duration, please adjust the DVR’s recording speed in the following three settings.

5.[RECORD IN ALARM]

Set the recording speed when an alarm is triggered.

6.[RECORD IN MOTION]

Set the recording speed when motion is detected.

7.[CONTINUOUS RECORD]

Set the recording speed under the continuous recording mode.

1.The recording speed is expressed in fractions. 1/ 1 is to record at the full recording speed, which you set in RESOLUTION. 1 / 2 is to record at half of the recording speed. 1 /3 is to record at one third of the recording speed. You can set up the parameter from 1/1, 1/2, 1/3, 1/4,… to 1/999.

2.By lowering the recording speed, the DVR records less frames but gains a longer recording duration. If you set the DVR’s recording speed at 1/2, the recording duration will be two times longer. 1/3 will make the recording duration three times longer, and so on.

3.When the RESOLUTION is set to QUAD Mode, the selection of the recording speed is limited to 1/1, 1/2, and 1/3.

4.All active cameras share the recording speed. To turn off the recording on a specific channel, please refer to [SYSTEM MENU]f[CONFIGURATION]f[CAMERA SETUP] f[CAMERA ACTIVE SETUP]. Please note that channels with video loss are still active and recording. In other words, those channels are still sharing the recording speed.

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Hitachi JPEG2000 manual Resolution, Record in Alarm, Record in Motion, Continuous Record

JPEG2000 specifications

Hitachi JPEG2000 is a high-performance image compression technology that utilizes advanced coding techniques to provide superior image quality while maintaining a smaller file size. It is built upon the JPEG2000 standard, which was developed by the Joint Photographic Experts Group (JPEG) to address limitations in traditional JPEG compression methods, particularly in terms of scalability, quality, and error resilience.

One of the main features of Hitachi JPEG2000 is its use of wavelet compression. Unlike the Discrete Cosine Transform (DCT) employed in standard JPEG, which works on small blocks of images, JPEG2000 utilizes a wavelet transform that allows for multi-resolution analysis of images. This means that images can be compressed at various quality levels, enabling users to access lower-resolution versions without needing to decompress the entire image. This scalability is particularly beneficial for applications like streaming and remote visualization, where bandwidth may be limited.

Another significant characteristic is its superior error resilience. Hitachi JPEG2000 is designed to gracefully handle data corruption that can occur during transmission. This feature is crucial for applications in medical imaging or satellite imagery, where maintaining image integrity is essential. The technology allows for random access to image components, enabling portions of an image to be retrieved without needing to decode the entire file. This capability enhances efficiency when dealing with large datasets.

Additionally, Hitachi JPEG2000 supports lossless compression, meaning that the original image quality can be preserved without any loss of data during compression. This is particularly important for fields such as healthcare, where diagnostic imaging requires absolute precision. The algorithm also offers adjustable compression rates, providing flexibility for different use cases without compromising quality.

The technology is widely implemented in various industries, including broadcasting, film production, and medical imaging, thanks to its ability to deliver high-quality images in a manageable file size. As a versatile solution, Hitachi JPEG2000 stands out with its combination of advanced compression techniques, error resilience, and scalability, making it a preferred choice in an increasingly digital world where efficient data handling is paramount.