Compression of Images

Overview

Compression of images triggered by a scheduler may be used in the following cases :

• images previously stored to archive were not compressed because no compression rule was configured.
• compression rules are configured, but avoid storage failures of objects to archive if compression of the images fails.

Configuration

• Configure Compression of received images as required by the application.

Using Archive UI

1. Go to Menu->Configuration, then on Devices page, Edit the dcm4chee-arc device. Edit Extension of Device Extension, then Edit Extension of Archive Device.
2. Configure values for fields Compression Polling Interval, Compression Fetch Size, Compression AE Title, Compression Schedule(s) and Compression Threads and Save.

Using LDAP

One may either

• create a LDIF file (e.g.):

    version: 1
    dn: dicomDeviceName=dcm4chee-arc,cn=Devices,cn=DICOM Configuration,dc=dcm4che,dc=org
    changetype: modify
    add: dcmCompressionPollingInterval
    dcmCompressionPollingInterval: P1D
    -
    
    dn: dicomDeviceName=dcm4chee-arc,cn=Devices,cn=DICOM Configuration,dc=dcm4che,dc=org
    changetype: modify
    add: dcmCompressionSchedule
    dcmCompressionSchedule: hour=22-24
    -
    
    dn: dicomDeviceName=dcm4chee-arc,cn=Devices,cn=DICOM Configuration,dc=dcm4che,dc=org
    changetype: modify
    add: dcmCompressionAETitle
    dcmCompressionAETitle: TEST_ARCHIVE_1
    -
    
    dn: dicomDeviceName=dcm4chee-arc,cn=Devices,cn=DICOM Configuration,dc=dcm4che,dc=org
    changetype: modify
    add: dcmCompressionFetchSize
    dcmCompressionFetchSize: 10
    -
    
    dn: dicomDeviceName=dcm4chee-arc,cn=Devices,cn=DICOM Configuration,dc=dcm4che,dc=org
    changetype: modify
    add: dcmCompressionThreads
    dcmCompressionThreads: 10
    -
  

  and import it to the LDAP Server by using the ldapmodify command line utility.

• or use the Add Attribute... and Add Value... function of Apache Directory Studio to add attributes on Device level (e.g.: dicomDeviceName=dcm4chee-arc) in the Archive Configuration.

One may refer to Archive Device
to understand the description of attributes.

Refer ISO-8601 Duration format for more know-how on Durations.

Go to the Control tab on Configuration page in archive UI and reload the configuration.