摘要:
A method of applying image data as a visually detectable pattern with at least one embedded data element at an optical record carrier is disclosed, comprising the step of physically mapping at least one channel symbol onto the record carrier, the channel symbol being selected from a set of mutually different channel symbols, the channel symbols each comprising an area of size s1 with a relatively low value v1 for an optical property and an area with size s2 with a relatively high value v2 for said optical property, the channel symbols being distributed over a plurality of subsets each having a plurality of channel symbols wherein the plurality of channel symbols within a subset have a distance that is substantially less than the distance between channel symbols of mutually different subsets, wherein the distance between two channel symbols is defined as the absolute difference between the ratios s1/(s1+s2). wherein the step of selecting comprises the step of determining a subset on the basis of the image data to be mapped in the visually detectable pattern and selecting one symbol from that subset on the basis of the at least one data symbol to be mapped. The invention further includes an apparatus, and a record carrier.
摘要:
A method is disclosed of reading an image data from an optical record carrier with a visually detectable pattern comprising a visually detectable pattern of pixels comprising at least one pattern element comprising an area of size s1 with a relatively low value v1 for an optical property and an area with size s2 with a relatively high value v2 for said optical property, wherein the data representative for a structure of the visually detectable pattern is embedded by variations in one or more of the parameters s1, v1, s2, v2 of the pattern elements. The method comprising the steps of scanning the visually detectable pattern and generating a detection signal representative for a visual property of the pattern as a function of position, retrieving the image data from the signal, retrieving an embedded data from the signal, generating an address data using said embedded data, storing image data values at addresses indicated by said address data.
摘要:
A method is disclosed of reading an image data from an optical record carrier with a visually detectable pattern comprising a visually detectable pattern of pixels comprising at least one pattern element comprising an area of size s1 with a relatively low value v1 for an optical property and an area with size s2 with a relatively high value v2 for said optical property, wherein the data representative for a structure of the visually detectable pattern is embedded by variations in one or more of the parameters s1, v1, s2, v2 of the pattern elements. The method comprising the steps of scanning the visually detectable pattern and generating a detection signal representative for a visual property of the pattern as a function of position, retrieving the image data from the signal, retrieving an embedded data from the signal, generating an address data using said embedded data, storing image data values at addresses indicated by said address data.
摘要:
A method of applying image data as a visually detectable pattern with at least one embedded data element at an optical record carrier is disclosed, comprising the step of physically mapping at least one channel symbol onto the record carrier, the channel symbol being selected from a set of mutually different channel symbols, the channel symbols each comprising an area of size s1 with a relatively low value v1 for an optical property and an area with size s2 with a relatively high value v2 for said optical property, the channel symbols being distributed over a plurality of subsets each having a plurality of channel symbols wherein the plurality of channel symbols within a subset have a distance that is substantially less than the distance between channel symbols of mutually different subsets, wherein the distance between two channel symbols is defined as the absolute difference between the ratios s1/(s1+s2). wherein the step of selecting comprises the step of determining a subset on the basis of the image data to be mapped in the visually detectable pattern and selecting one symbol from that subset on the basis of the at least one data symbol to be mapped. The invention further includes an apparatus, and a record carrier.
摘要:
The invention relates to a method for setting an optimum value of a write parameter for use in an optical recording apparatus for writing information on an optical recording medium by means of a radiation beam. The optimum value of a write parameter is found by deriving a plurality of characteristic write power levels (PChar) from a plurality of curve-fitting functions. Each characteristic write power level (PChar) has an associated initial value of the write power level (TV), and the optimum value of the write parameter is found by comparing the characteristic write power levels to the initial write power levels. The invention also relates to an optical recording apparatus for recording information on an optical recording medium, the apparatus having a radiation source for emitting a radiation beam having a controllable value of a write power level for recording information on the recording medium.
摘要:
An apparatus generates outgoing data (OD) to be provided on an optical disk (1) in a burst cutting area (2). The burst cutting area (2) further comprises markings (3) which cause a marking frequency spectrum (MFS) when reading out the burst cutting area (2). The apparatus comprises a channel coder (4) which receives processed data (PD) and supplies the outgoing data (OD) having an outgoing data frequency spectrum (DFS) with suppressed DC-content. The apparatus further comprises a data processing device (5) which generates the processed data (PD) to obtain an outgoing frequency spectrum (DFS) wherein a frequency component causing interference with a low frequent component of the markings (3) is suppressed or not present.
摘要:
The invention relates to a method for setting an optimum value of a write parameter for use in an optical recording apparatus for writing information on an optical recording medium by means of a radiation beam. The optimum value of a write parameter is found by curve-fitting a function and obtaining a characteristic write power level (PChar) from the curve-fitting function. It is then assessed if the characteristic write power level (PChar) qualify as an optimum value of a write parameter. If the characteristic write power level (Pchar) does not qualify as an optimum value of a write parameter then an iteration procedure is started, where the subsequent initial values of write power level (Pini, n), are given by Pini, n+1=A Pini, n+(1−A)Pchar, n, where A is a constant, and n is an integer. The invention also relates to an optical recording apparatus and an optical recording medium according to the invention.
摘要:
The invention relates to a method for determining write strategy parameter values for writing data on an optical disk from a group of optical disks of different types using an optical disk drive, in particular to different types of BD disks. The method includes identifying the type of optical disk, the type of optical disk being associated with a standard write strategy with standard write strategy parameters; determining a cluster write strategy with cluster write strategy parameters, the number of cluster write strategy parameters being smaller than the number of standard write strategy parameters; initializing the cluster write strategy parameters with initial cluster write strategy parameter values; and optimizing cluster write strategy parameter values for at least a subset of the cluster write strategy parameters. The optimizing is preferably performed on optimization sets of cluster write strategy parameters in a pre-determined optimization order.
摘要:
An optical reading/writing apparatus has an optical head that includes a collimator and a lens. For efficient and reliable focusing control for writing an empty optical disk, calibration of focus offset and spherical aberration is executed by setting a boundary and performing data-reading in an OPC area only with combinations of focus offset and spherical aberration within the boundary. Accordingly, an optimum combination of focus offset and spherical aberration is determined for focusing compensation in subsequent writing operation of the empty disk.
摘要:
A method of analyzing the quality of optical effects on an optical recording medium as well as applications of the method in connection with optimizing a write strategy and analyzing the write quality for an optical recording medium are disclosed. The method comprising the steps of determining waveforms of a measured and a nominal optical signal, and calculating an amplitude-difference parameter from a difference in the measured and nominal waveforms. A quality measure of the optical effects can thereby be determined from the amplitude-difference parameter. The applications of the method include, but are not limited to: a device for reading optical effects from an optical storage medium with means for determining the an amplitude-difference parameter, an optical recording apparatus with means for adjusting the power level and/or level duration in a write strategy and an IC for controlling an optical storage apparatus.