CN116204109A - Data reading method and device and optical storage system - Google Patents

Abstract

The application provides a data reading method, a data reading device and an optical storage system, which relate to the technical field of data storage and are used for improving the speed of data reading. The method is applied to the reading device, and comprises the following steps: the reading device forms reference images on a plurality of storage layers included in the optical disc; the reading device scans the reference image on a target storage layer in a plurality of storage layers at a first vertical position to determine a first definition parameter of the reference image; the reading device scans the reference image on the target storage layer at a second vertical position to determine a second definition parameter of the reference image, wherein the distance between the first vertical position and the second vertical position is smaller than the interval thickness of two adjacent storage layers in the plurality of storage layers; the reading device determines a third vertical position according to the second vertical position, the first definition parameter, the second definition parameter and the target definition parameter of the target storage layer; the reading device scans the target storage layer at the third vertical position to read target data in the target storage layer.

Description

Data reading method and device and optical storage system

Technical Field

The present disclosure relates to the field of data storage technologies, and in particular, to a data reading method, a data reading device, and an optical storage system.

Background

With the rapid development of emerging technologies such as the internet of things, global data is growing in a well-spraying manner. Data grows slowly in 2010 to 2017, rapidly in 2017 to 2025, and the global data amount in 2025 is up to 160ZB, and 70% of the data in 160ZB needs to be backed up and archived for a long period (i.e., 70% of the data is cold data). Generally, these cold data are stored by using an optical disc, and the storage capacity of the conventional optical disc is affected by the total storage area and the number of storage layers, so that the storage capacity has reached a bottleneck, and cannot meet the increasing storage demands of users.

In order to meet the storage requirements of users, the number of storage layers of a single optical disc will increase to 50-100 layers in the future. Fig. 1 is a schematic structural diagram of an optical disc including a plurality of storage layers, where an isolation layer is disposed between two adjacent storage layers, for example, the plurality of storage layers may include 100 storage layers, and the 100 storage layers are used for storing data. In order to be able to read data in a plurality of storage layers in the optical disc, the plurality of storage layers and the isolation layer each have a high transparency, so that the plurality of storage layers and the isolation layer each have a high light transmittance, but an increase in light transmittance causes an increase in difficulty in reading data in the optical disc. Therefore, a data reading method is needed.

Disclosure of Invention

The application provides a data reading method, a data reading device and an optical storage system, which are used for improving the data reading speed.

In order to achieve the above purpose, the present application adopts the following technical scheme:

in a first aspect, a data reading method is provided, the method being applied to a reading device, the method comprising: the reading device forms reference images on a plurality of storage layers included in the optical disc; the reading device scans the reference image on a target storage layer in the plurality of storage layers at a first vertical position to determine a first definition parameter of the reference image; the reading device scans the reference image on the target storage layer at a second vertical position to determine a second definition parameter of the reference image, wherein the distance between the first vertical position and the second vertical position is smaller than the interval thickness of two adjacent storage layers in the plurality of storage layers; the reading device determines a third vertical position according to the second vertical position, the first definition parameter, the second definition parameter and the target definition parameter of the target storage layer; the reading device scans the target storage layer at the third vertical position so as to read target data in the target storage layer.

According to the technical scheme, the distance between the first vertical position and the second vertical position is smaller than the interval thickness of two adjacent storage layers in the plurality of storage layers, so that the reading device can move up and down in the target storage layers, the reference image scanned by the reading device is the reference image on the target storage layer in the plurality of storage layers, the reading device can directly determine the third vertical position according to the first clear parameter, the second clear parameter and the target clear parameter of the target storage layer, the third vertical position is the scanning position of the target storage layer, and the target storage layer is scanned at the third vertical position, so that target data in the target storage layer can be read, the scanning positions of other storage layers above the target storage layer are not required to be determined, the efficiency of determining the target storage layer is improved, namely the layer jump efficiency is improved, and the data reading speed is further improved.

In a possible implementation manner of the first aspect, the determining, by the reading device, a third vertical position according to the second vertical position, the first definition parameter, the second definition parameter, and the target definition parameter of the target storage layer includes: the reading device determines an offset direction according to the first definition parameter and the second definition parameter; the reading device determines an offset distance according to the second definition parameter and the target definition parameter of the target storage layer; the reading device determines the third vertical position according to the second vertical position, the offset direction and the offset distance. In the above possible implementation manner, the third vertical position may be directly determined according to the offset direction and the offset distance, where the third vertical position is the scanning position of the target storage layer, and compared with determining a storage layer requires a lot of time to fine tune the reading device, the speed of determining the scanning position of the target storage layer is improved.

In a possible implementation manner of the first aspect, the first vertical position is located below the second vertical position, and the determining, by the reading device, the offset direction according to the first sharpness parameter and the second sharpness parameter includes: if the first clear parameter is larger than the second clear parameter, the reading device determines that the offset direction is downward; if the first definition parameter is smaller than the second definition parameter, the reading device determines that the offset direction is upward. In the above possible implementation manner, the offset direction may be determined according to the first definition parameter and the second definition parameter, so that a lot of time is not required to be spent to fine-tune the reading device, and the speed of determining the scanning position of the target storage layer is improved.

In a possible implementation manner of the first aspect, the first vertical position is located above the second vertical position, and the determining, by the reading device, the offset direction according to the first sharpness parameter and the second sharpness parameter includes: if the first clear parameter is larger than the second clear parameter, the reading device determines that the offset direction is upward; if the first definition parameter is smaller than the second definition parameter, the reading device determines that the offset direction is downward. In the above possible implementation manner, the offset direction may be determined according to the first definition parameter and the second definition parameter, so that a lot of time is not required to be spent to fine-tune the reading device, and the speed of determining the scanning position of the target storage layer is improved.

In a possible implementation manner of the first aspect, the target data includes a target data block, and the reading device scans the target storage layer at the third vertical position, including: the reading device determines a first horizontal position so that the target data block is positioned inside the reference image on the target storage layer; the reading device scans the target storage layer according to the first horizontal position and the third vertical position. In the above possible implementation manner, the reading device can easily scan the reference image, and when the target data block is located in the reference image, the reading device is convenient to scan the target data block, so that the efficiency of reading target data in the target data block is improved.

In a possible implementation manner of the first aspect, the reference image is rectangular in shape, the target data includes a target data block, and the reading device scans the target storage layer at the third vertical position, including: the reading means determines a second horizontal position such that four sides of the target data block are parallel to corresponding sides of the four sides of the reference image on the target storage layer. In the above possible implementation manner, when the reference image just can accommodate a target data block, the reading device determines the second horizontal position, so that four sides of the target data block are respectively parallel to corresponding sides of four sides of the reference image on the target storage layer, thereby ensuring that the target data block is inside the reference image, and improving the efficiency of reading target data in the target data block.

In a possible implementation manner of the first aspect, before the reading device scans the reference image on the target storage layer in the plurality of storage layers in the first vertical position, the method further includes: the reading device scans the reference image on the plurality of storage layers to determine a plurality of target definition parameters including the target definition parameters of the reference image on the target storage layer. In the possible implementation manner, the scanning position of the target storage layer can be directly determined through the target definition parameter, the first definition parameter and the second definition parameter without determining the scanning positions of other storage layers above the target storage layer, so that the efficiency of determining the scanning position of the target storage layer is improved, and the efficiency of reading target data is further improved.

In a possible implementation manner of the first aspect, the reference image is a diaphragm image, and the reading device includes an imaging unit, where the imaging unit includes: the light source, the light collecting lens group, the diaphragm and the light collecting lens group are sequentially arranged; the light source is used for forming the diaphragm image on the optical disk through the light collecting lens group, the diaphragm and the light collecting lens group. In the possible implementation manner, the reading device can easily focus and scan the reference image, so that the efficiency of determining the storage layer is improved, and the speed of reading data is further improved.

In a second aspect, there is provided a reading apparatus comprising: an imaging unit for forming reference images on a plurality of storage layers included in the optical disc; a reading unit for scanning the reference image on a target storage layer of the plurality of storage layers at a first vertical position to determine a first sharpness parameter of the reference image; the reading unit is further used for scanning the reference image on the target storage layer at a second vertical position to determine a second definition parameter of the reference image, and the distance between the first vertical position and the second vertical position is smaller than the interval thickness of two adjacent storage layers in the plurality of storage layers; the reading unit is further configured to determine a third vertical position according to the second vertical position, the first definition parameter, the second definition parameter, and the target definition parameter of the target storage layer; the reading unit is further configured to scan the target storage layer at the third vertical position to read target data in the target storage layer.

In a possible implementation manner of the second aspect, the reading unit is further configured to: determining an offset direction according to the first definition parameter and the second definition parameter; determining an offset distance according to the second definition parameter and the target definition parameter of the reference image on the target storage layer; the third vertical position is determined based on the second vertical position, the offset direction, and the offset distance.

In a possible implementation manner of the second aspect, the first vertical position is located below the second vertical position, and the reading unit is further configured to: if the first clear parameter is larger than the second clear parameter, determining that the offset direction is downward; if the first definition parameter is smaller than the second definition parameter, determining that the offset direction is upward.

In a possible implementation manner of the second aspect, the first vertical position is located above the second vertical position, and the reading unit is further configured to: if the first clear parameter is larger than the second clear parameter, determining that the offset direction is upward; if the first definition parameter is smaller than the second definition parameter, determining that the offset direction is downward.

In a possible implementation manner of the second aspect, the target data includes a target data block, and the reading unit is further configured to: determining a first horizontal position so that the target data block is located inside the reference image on the target storage layer; and scanning the target storage layer according to the first horizontal position and the third vertical position.

In a possible implementation manner of the second aspect, the reference image is rectangular in shape, the target data includes a target data block, and the reading unit is further configured to: a second horizontal position is determined such that four sides of the target data block are parallel to corresponding sides of the four sides of the reference image on the target storage layer.

In a possible implementation manner of the second aspect, the first vertical position is determined according to a thickness of each storage layer of the plurality of storage layers and a number of layers of the target storage layer.

In a possible implementation manner of the second aspect, before the reading device scans the reference image on the target storage layer of the plurality of storage layers in the first vertical position, the reading unit is further configured to: the reference image on the plurality of storage layers is scanned to determine a plurality of target sharpness parameters including the target sharpness parameters of the reference image on the target storage layer.

In a possible implementation manner of the second aspect, the reference image is a diaphragm image, and the imaging unit includes: the light source, the light collecting lens group, the diaphragm and the light collecting lens group are sequentially arranged; the light source is used for forming the diaphragm image on the optical disk through the light collecting lens group, the diaphragm and the light collecting lens group.

In a third aspect, an optical storage system is provided, the optical storage system comprising an optical disc and a reading device, the optical disc for storing data; the reading means is for performing a data reading method as provided by the first aspect or any one of the possible implementations of the first aspect.

In yet another aspect of the present application, there is provided a computer readable storage medium comprising computer instructions which, when executed, perform a data reading method as provided by the first aspect or any one of the possible implementations of the first aspect.

In a further aspect of the present application, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the data reading method provided by the first aspect or any one of the possible implementations of the first aspect.

It will be appreciated that any of the reading device and the optical storage system provided above may be used to perform the corresponding method provided above, and thus, the advantages achieved by the reading device and the optical storage system may refer to the advantages of the corresponding method provided above, and will not be described herein.

Drawings

FIG. 1 is a schematic diagram of an optical disc including a plurality of storage layers;

FIG. 2 is a schematic structural diagram of an optical storage system according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of an imaging unit according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a camera imaging according to an embodiment of the present application;

Fig. 5 is a flow chart of a data reading method according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a diaphragm image and a target data block according to an embodiment of the present application;

FIG. 7 is a schematic diagram of an adjustment target data block according to an embodiment of the present application;

FIG. 8 is a schematic diagram of another adjustment target data block according to an embodiment of the present application;

FIG. 9 is a schematic flow chart of determining an offset direction and a third vertical position according to an embodiment of the present application;

fig. 10 is a flowchart of a data reading method according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a reading device according to an embodiment of the present application.

Detailed Description

In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a. b, c, a and b, a and c, b and c, or a and b and c, wherein a, b and c can be single or multiple. In addition, the embodiments of the present application use the words "first," "second," etc. to distinguish between the same item or similar items that have substantially the same function and effect. For example, the first threshold and the second threshold are merely for distinguishing between different thresholds, and are not limited in order. Those skilled in the art will appreciate that the words "first," "second," and the like do not limit the number and order of execution.

In this application, the terms "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

Before describing the embodiments of the present application, a description will be first made of a related art of data reading in an optical disc.

Currently, optical storage systems including a reading device are commonly used to read data in an optical disc. The optical disc may include a plurality of storage layers stacked in order, and an isolation layer is provided between any adjacent two of the storage layers. When the data in the target storage layer in the storage layers needs to be read, the reading device scans the storage layers sequentially from top to bottom, determines the scanning position of the next storage layer based on the scanning position after determining the scanning position of the last storage layer, and reads the target data in the target storage layer until the scanning position of the target storage layer is determined, thereby completing the skip layer reading.

For example, the optical disc may include 100 storage layers stacked in sequence, and when data in a 5 th storage layer of the 100 storage layers needs to be read, the 5 th storage layer may be a 5 th storage layer of the 100 storage layers from top to bottom, the reading device scans the 100 storage layers in sequence from top to bottom and determines a scanning position of the storage layers layer by layer, that is, determines a scanning position of the 1 st storage layer, a scanning position of the 2 nd storage layer, a scanning position of the 3 rd storage layer, and a scanning position of the 4 th storage layer in sequence through judgment of scanning and data definition, and then determines a storage layer scanned for the 5 th storage layer and determines a corresponding scanning position, and reads target data in the 5 th storage layer at the corresponding scanning position.

In the above data reading technology, when determining the scanning position of the target storage layer, the scanning position of the target storage layer can be determined only after the scanning positions of other storage layers (namely the 1 st to 4 th storage layers) above the target storage layer are determined, and because the interface reflection between the adjacent storage layers and the isolation layer is low, the reading device needs to spend much time for fine adjustment every time determining the scanning position of one storage layer, so that the definition of the data can meet the reading requirement, thereby reducing the efficiency of layer jump and further reducing the speed of data reading.

The embodiment of the application provides a data reading method which is applied to an optical storage system comprising a reading device, and can directly determine the scanning position of a target storage layer without determining the scanning positions of other storage layers positioned above the target storage layer, so that the efficiency of determining the scanning position of the target storage layer is improved, and the data reading speed is further improved.

The structure of the optical storage system will be described first.

Fig. 2 is a schematic diagram of a possible structure of an optical storage system according to an embodiment of the present application, where, as shown in fig. 2, the optical storage system may include: a reading device 201, an optical disc 202 and an interface 203.

Wherein the reading device 201 is operable to form a reference image on the optical disc 202 and to read data in the optical disc 202. The reading device 201 may also be referred to as a read-write optical drive. The reading device 201 may include an imaging unit and a reading unit.

The imaging unit may be used to form a reference image on the optical disc 202, for example, the imaging unit may be used to form a reference image on a plurality of storage layers included in the optical disc 202, and the reference image may be a diaphragm image. The imaging unit may also be referred to as a read-write optical path. By way of example, fig. 3 is a schematic diagram of a possible structure of an imaging unit, which may include: the light source, the collection lens group, the diaphragm and the collection lens group are sequentially arranged, and the light source is used for forming a diaphragm image on the optical disc 202 after passing through the collection lens group, the diaphragm and the collection lens group (including the back focal plane of the collection lens group). Wherein the diaphragm may be a rectangular diaphragm, for example, the diaphragm may be a rectangular diaphragm of 20.4mm x 20.4 mm. The collection optics have a magnification, for example, the magnification of the collection optics may be 40. The imaging unit may further include: a camera with a complementary metal oxide semiconductor (complementary metal oxide semiconductor, CMOS) device for receiving parameter information of a reference image in the optical disc 202, for example, the CMOS device may be used to receive a sharpness parameter of the reference image in the optical disc 202.

The reading unit may be used to scan the optical disc 202 and read data in the optical disc 202. For example, the reading unit may be used to scan a plurality of storage layers in the optical disc 202, and scan the storage layers at the scanning positions of the storage layers to be read to read the data stored in the storage layers. The reading unit may include: objective lens, lead zirconate titanate piezoelectric ceramic (lead zirconate titanate piezoelectric ceramics, PZT) driver, displacement stage and controller. The PZT driver is connected to the objective lens and is used for driving the objective lens to move, for example, the PZT driver can be used for receiving a signal sent by the controller and moving according to the signal so as to drive the objective lens to move, and the signal can be a driving signal for moving upwards or a driving signal for moving downwards. For example, fig. 4 is a schematic diagram of imaging by a camera, and as shown in fig. 4, a reference image on the optical disc 202 may be presented in the camera after passing through the objective lens and the relay lens group.

The displacement stage may be used for placing the optical disc 202, and is further used for receiving a signal sent by the controller and performing rotational fine tuning according to the received signal. The displacement stage and the camera are mechanical components of the reading device 201. A controller may be used to control the camera and displacement stage movements. For example, the controller may be used to control camera movement based on the sharpness parameter, and the controller may be implemented by a control chip module.

The optical disc 202 may be used to store data. The optical disc 202 stores data by taking advantage of the characteristic that the optical properties of the material constituting the optical disc 202 exhibit long-term stability. The optical disc 202 may also be referred to as a storage medium. The optical disc may include a plurality of storage layers stacked in order, and an isolation layer is provided between any adjacent two of the storage layers. Each of the plurality of storage layers may be used to store data and the isolation layer may be used to isolate two adjacent storage layers. For example, an optical disc may include 100 storage layers, each of the 100 storage layers being available for storing data.

The interface 203 may be used to support communication with an optical storage system, such as between optical storage systems and peripheral devices connected to the optical storage system.

The method of data reading provided in the present application is described below in conjunction with the optical storage system shown in fig. 2.

Fig. 5 is a flowchart of a data reading method according to an embodiment of the present application, and as shown in fig. 5, the data reading method includes the following steps.

S501: the reading device forms a reference image on a plurality of storage layers included in the optical disc.

Wherein each storage layer of the plurality of storage layers is operable to store data. The plurality of storage layers may include 50 storage layers or 100 storage layers, etc., and the number of the plurality of storage layers is not specifically limited in the embodiment of the present application.

In addition, the reading device forming the reference image on the plurality of storage layers may form the reference image on each of the plurality of storage layers for the reading device. For example, the plurality of memory layers includes 100 memory layers, and the reading device forms a reference image on each of the 100 memory layers, i.e., 100 reference images.

Furthermore, the reference image may be a diaphragm image. The shape of the diaphragm image may be any shape, for example, the shape of the diaphragm image may be rectangular or circular ring-shaped, etc., for example, the shape of the diaphragm image may be square or rectangular. In the following embodiments, the diaphragm image is taken as a rectangular diaphragm image as an example.

S502: the reading device scans a reference image on a target storage layer of the plurality of storage layers at a first vertical position to determine a first sharpness parameter of the reference image.

The target storage layer is any one of the plurality of storage layers, for example, the target storage layer may be a 1 st storage layer or a 5 th storage layer of the plurality of storage layers. In the following embodiments, a description will be given taking, as an example, a storage layer located at the top layer among a plurality of storage layers in order from top to bottom.

In addition, the sharpness parameter may be a parameter for directly or indirectly reflecting sharpness, and the sharpness parameter may be a sharpness evaluation value, where the sharpness evaluation value may be obtained by a certain algorithm (for example, an image recognition algorithm) or a function. For example, the first sharpness parameter, and the second sharpness parameter and the target sharpness parameter described below may each be a parameter for directly or indirectly reflecting sharpness, and the first sharpness parameter may be a first sharpness evaluation value. The first sharpness parameter may be used to indicate sharpness of the reference image scanned onto the target storage layer by the reading apparatus when the reading apparatus is in the first vertical position. In practical applications, the value range of the first sharpness parameter may be 0-1, where 1 indicates that the sharpness of the reference image is optimal, and 0 indicates that the sharpness of the reference image is lowest.

The vertical position may refer to a position of the camera in the reading device in a vertical direction. For example, the first vertical position and the second and third vertical positions described below may each refer to a position of the camera in the vertical direction in the reading device.

Further, the first vertical position may also be referred to as an initial scanning position or a coarse focus position of the target storage layer. The first vertical position may be determined according to a spacing thickness of two adjacent storage layers of the plurality of storage layers and a number of layers of the target storage layer. Illustratively, the plurality of storage layers includes 100 storage layers, an isolation layer is disposed between two adjacent storage layers of the 100 storage layers, a spacing thickness of the two adjacent storage layers of the plurality of storage layers is 20 micrometers (μm), the spacing thickness may include a thickness of a single storage layer and a thickness of the isolation layer adjacent to the storage layer, a thickness of the entire optical disc is 2000 μm (20 μm×100), and the first vertical position is at 100 μm (20 μm×5) when the target storage layer is a 5 th storage layer of the 100 storage layers.

S503: the reading device scans the reference image on the target storage layer at a second vertical position to determine a second sharpness parameter of the reference image, the distance between the first vertical position and the second vertical position being smaller than the spacing thickness of two adjacent storage layers of the plurality of storage layers.

Wherein the second vertical position may also be referred to as a fine focus position of the target storage layer. The reading device may be driven by a drive signal to move the reading device from the first vertical position to the second vertical position, e.g. the reading device may be driven by a drive signal to move the reading device upwards or by a drive signal to move the reading device downwards to move from the first vertical position to the second vertical position. Specifically, when the reading device moves upward in a first vertical position to reach the second vertical position, the first vertical position is below the second vertical position; when the reading device reaches a second vertical position by moving down in the first vertical position, the first vertical position is above the second vertical position. The distance between the first vertical position and the second vertical position is smaller than the spacing thickness of two adjacent storage layers of the plurality of storage layers, for example, the distance between the first vertical position and the second vertical position may be 10 μm.

Specifically, the movement of the reading device from the first vertical position to the second vertical position under the driving of the driving signal may refer to: a controller in the reading device drives the camera to move by the driving signal so that the camera moves from the first vertical position to the second vertical position.

In addition, the second sharpness parameter may be a second sharpness evaluation value, where the second sharpness parameter may be used to indicate sharpness of the reference image scanned onto the target storage layer when the reading apparatus is in the second vertical position.

Optionally, a thickness of an individual storage layer of the plurality of storage layers is less than a thickness of the individual storage layer. For example, when the thickness of the single memory layer is 20 μm, the thickness of the single memory layer of the plurality of memory layers is less than 20 μm, and the thickness of the single memory layer of the plurality of memory layers may be 10 μm.

S504: the reading device determines a third vertical position according to the second vertical position, the first definition parameter, the second definition parameter and the target definition parameter of the target storage layer.

The target definition parameter may be a target definition parameter of the reference image on the target storage layer, and the target definition parameter may also be an optimal definition evaluation value, where the definition of the reference image on the target storage layer meets a data reading requirement. The target definition parameters may be preset, and the target definition parameters may be preset according to actual needs and experience of related technicians.

In addition, this third vertical position may also be referred to as the best focus position or the clear imaging position.

Specifically, determining the third vertical position may include: the reading device determines an offset direction according to the first definition parameter and the second definition parameter; the reading device determines an offset distance according to the second definition parameter and the target definition parameter of the target storage layer; the reading device determines the third vertical position according to the second vertical position, the offset direction and the offset distance.

The process of determining the offset direction by the reading device according to the first definition parameter and the second definition parameter will be described in detail below.

In one possible embodiment, the first vertical position is located below the second vertical position, and determining the offset direction includes: the reading device compares the first definition parameter with the second definition parameter, and if the first definition parameter is larger than the second definition parameter, the reading device determines that the offset direction is downward; if the first definition parameter is smaller than the second definition parameter, the reading device determines that the offset direction is upward.

In another possible embodiment, the first vertical position is located above the second vertical position, and determining the offset direction includes: the reading device compares the first definition parameter with the second definition parameter, and if the first definition parameter is larger than the second definition parameter, the reading device determines that the offset direction is upward; if the first definition parameter is smaller than the second definition parameter, the reading device determines that the offset direction is downward.

The process of determining the offset distance by the reading device according to the second sharpness parameter and the target sharpness parameter will be described in detail below. The reading device compares the second definition parameter with the target definition parameter of the target storage layer to obtain a difference value, and converts the difference value into an offset voltage signal, and the reading device determines an offset distance according to the offset voltage signal, for example, when the offset voltage signal is 5mv, the corresponding offset distance is 10 μm.

In one possible embodiment, the reading device may calculate the third vertical position according to the second vertical position, the offset direction and the offset distance, and drive the reading device to the third vertical position.

Specifically, the controller in the reading device may compare the second definition parameter with the target definition parameter of the target storage layer to obtain a difference value, convert the difference value into an offset voltage signal, send the offset voltage signal to the camera, and move an offset distance according to the offset voltage signal.

S505: the reading device scans the target storage layer at the third vertical position so as to read target data in the target storage layer.

Wherein the target data may comprise a plurality of target data blocks. Accordingly, reading the target data in the target storage layer may include: the reading device scans the plurality of target data blocks block by block and reads data in each of the plurality of target data blocks in turn.

Alternatively, the size of the diaphragm image may be larger than the size of the target data block. Fig. 6 is a schematic diagram illustrating a structure of a diaphragm image and a target data block. For example, the size of the target data block may be 500 μm×500 μm, the aperture may be a rectangular aperture having a size of 20.4mm×20.4mm, the magnification of the condenser lens group may be 40 times, and the rectangular aperture having a size of 20.4mm×20.4mm may present a rectangular aperture image having a size of 510 μm×510 μm on the target storage layer by scaling the condenser lens group by 40 times, so that the aperture image may just accommodate one target data block.

Further, the reading device can adjust different horizontal positions to read the data in each of the plurality of target data blocks. The adjustment of the reading means to different horizontal positions may comprise the following two cases. The horizontal position may refer to a position of the displacement table in the horizontal direction in the reading device.

In a possible embodiment, the reading means determine a first horizontal position such that the target data block is located inside the reference image on the target storage layer, the reading means scanning the target storage layer according to the first horizontal position and the third vertical position.

Illustratively, FIG. 7 is a schematic diagram of an adjustment target data block. When the reading device is in the horizontal position S1, the target data block is outside the reference image, as shown in (a) of fig. 7; when the reading device is moved from the horizontal position S1 to the horizontal position S2, so that the target data block is inside the reference image, as shown in (b) of fig. 7. In this embodiment, the reading device easily focuses and scans the reference image, and when the target data block is located inside the reference image, the reading device is convenient to focus and scan the target data block, so that the efficiency of reading target data in the target data block is improved.

Wherein, the movement of the reading device from the horizontal position S1 to the horizontal position S2 in the horizontal direction may specifically refer to: the controller in the reading apparatus controls the displacement table to move from the horizontal position S1 to the horizontal position S2 such that the optical disc placed on the displacement table also correspondingly moves from the horizontal position S1 to the horizontal position S2, thereby causing the target data block to be inside the reference image.

In another possible embodiment, the reading means determines the second horizontal position such that four sides of the target data block are parallel to corresponding sides of the four sides of the reference image on the target storage layer.

Illustratively, FIG. 8 is a schematic diagram of another adjustment target data block. When the reading device is at the horizontal position S3, the four sides of the target data block form a certain included angle with the corresponding side of the four sides of the reference image, as shown in (a) of fig. 8; when the reading device is moved from the horizontal position S3 to be at the horizontal position S4, four sides of the target data block are parallel to corresponding sides of the four sides of the reference image, as shown in (b) of fig. 8. In this embodiment, when the reference image just can accommodate a target data block, the reading device determines the second horizontal position so that four sides of the target data block are parallel to corresponding sides of the four sides of the reference image on the target storage layer, thereby ensuring that the target data block is inside the reference image, and further ensuring the accuracy of reading target data in the target data block.

Alternatively, the camera in the reading apparatus may read the data in each of the plurality of target data blocks according to its frame rate, the size of the target data block, and the speed at which the displacement stage is moved. By way of example, when the frame rate of the camera is 100 transmission frames per second (frames per second, fps) and the size of the target data block is 500 μm×500 μm, the speed at which the displacement stage moves may be 50mm/s (500 μm×100 fps).

Further, before S505, the method further includes: the reading device scans the reference image on the plurality of storage layers to determine a plurality of target definition parameters including the target definition parameters of the reference image on the target storage layer.

Specifically, the reading device scans the reference image on each storage layer of the plurality of storage layers layer by layer to obtain the target definition parameters of the reference image on each storage layer of the plurality of storage layers, thereby determining a plurality of target definition parameters. In the embodiment of the application, the scanning position of the target storage layer can be directly determined through the target definition parameter, the first definition parameter and the second definition parameter of the target storage layer without determining the scanning positions of other storage layers positioned above the target storage layer, so that the efficiency of determining the scanning position of the target storage layer is improved, and the efficiency of reading target data is further improved.

The process of determining the offset direction and the third vertical position in the above-described data reading method will be described below by taking the flowchart shown in fig. 9 as an example. As shown in fig. 9, the process includes: s100, the reading device scans a plurality of storage layers to obtain an optimal definition evaluation value X0 of a reference image on a target storage layer (namely, the reading device scans the plurality of storage layers to obtain the optimal definition evaluation value X0); s101, a reading device scans a reference image on a target storage layer at a coarse focusing position to obtain a first definition evaluation value X1 (namely, the reading device obtains the first definition evaluation value X1 at the coarse focusing position); s102, a controller in the reading device drives the camera to move upwards through a driving signal so as to enable the camera to move from a coarse focusing position to a fine focusing position, and the reading device scans a reference image on a target storage layer at the fine focusing position to obtain a second definition evaluation value X2 (namely, the reading device obtains the second definition evaluation value X2 at the fine focusing position); s103, judging whether X1 is smaller than X2, if X1 is smaller than X2 (namely, yes), executing S104, and if X1 is larger than X2 (namely, no), executing S105; s104, the reading device determines the offset direction to be upward (the best focusing position is above the coarse focusing position); s105, the reading device determines the offset direction to be downward (the best focusing position is below the coarse focusing position); s106, a controller in the reading device compares X2 with X0 to obtain a difference value, and converts the difference value into an offset voltage signal and sends the offset voltage signal to the camera (namely the reading device obtains the offset voltage signal); s107, the camera in the reading device receives the offset voltage signal and moves a corresponding offset distance according to the offset voltage signal, so as to determine the best focus position (namely, the reading device determines the best focus position).

For easy understanding, the technical solution provided in the present application is illustrated below by taking the flowchart shown in fig. 10 as an example.

As shown in fig. 10, the method includes: s111, the reading device scans a plurality of storage layers to obtain a target definition evaluation value of a reference image on a target storage layer (namely, determining the target definition evaluation value of the target storage layer); s112, the reading device scans the target storage layer at the coarse focusing position to obtain a first definition evaluation value; s113, the reading device drives the reading device to move from a coarse focusing position to a fine focusing position through a driving signal, scans a reference image on a target storage layer at the fine focusing position to obtain a second definition evaluation value of the reference image on the target storage layer, determines an offset direction according to the first definition evaluation value and the second definition evaluation value, determines an offset distance according to the second definition evaluation value and the target definition evaluation value, and determines an optimal focusing position according to the offset direction and the offset distance (namely, determines the optimal focusing position according to the first definition evaluation value, the second definition evaluation value and the target definition evaluation value); s114, the reading device determines a second horizontal position so that four sides of the reference image are parallel to corresponding sides of four sides of the target data block in the target data, and scans the target storage layer at the second horizontal position and the optimal focusing position to read the target data (namely, adjusts the displacement table at the second horizontal position to read the target data); s115, the reading device determines a first horizontal position so that a target data block is positioned in the reference image on the target storage layer, and scans the target storage layer at the first horizontal position and the best focusing position to read target data (namely, adjusts the displacement table at the first horizontal position to read the target data); s116, the reading device synchronously controls the moving speed of the displacement table according to the frame rate of the camera and the size of the target data block so as to read the target data.

When the reading device needs to read the data in the next target storage layer, the reading device may continue to perform steps S501 to S505 in the above method embodiment to read the data in the next target storage layer. .

In the data reading method provided by the embodiment of the application, when target data in a target storage layer in a plurality of storage layers are read, the reading device scans a reference image on the target storage layer at the first vertical position to determine a first definition of the reference image, and scans the reference image on the target storage layer at the second vertical position to determine a second definition of the reference image. Compared with the existing data reading technology that the reading device needs to determine the scanning position of other storage layers above the target storage layer before determining the scanning position of the target storage layer, and because the interface reflection between the adjacent storage layers and the isolation layer is low, the reading device needs to spend much time for fine adjustment when determining the scanning position of one storage layer, so that the definition of data can meet the reading requirement.

It will be appreciated that the optical storage system, in order to achieve the above-described functions, comprises corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the data reading method steps of the examples described in connection with the embodiments herein may be implemented as hardware or a combination of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The embodiment of the application may divide the functional modules of the optical storage system according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.

Fig. 11 shows a schematic diagram of one possible configuration of the reading apparatus involved in the above-described embodiment in the case of dividing the respective functional modules with the respective functions, the reading apparatus including: an imaging unit 201 and a reading unit 202. The imaging unit 201 is configured to support the reading device to perform S501 in the above-described method embodiment, and the reading unit 202 is configured to support the reading device to perform one or more steps S502 to S505 in the above-described method embodiment.

In a hardware implementation, the imaging unit 201 may be the imaging unit in the optical storage system of fig. 2, and the reading unit 202 may be the reading unit in the optical storage system of fig. 2. For a specific description of the imaging unit and the reading unit, reference may be made to the specific description in fig. 2, and the embodiments of the present application will not be repeated here.

It should be noted that, all relevant contents of each step related to the above method embodiment may be cited to the functional description of the corresponding functional module, which is not described herein. The device provided by the embodiment of the application is used for executing the corresponding functions in the embodiment, so that the same effects as those of the control method can be achieved.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another apparatus, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, comprising several instructions for causing an apparatus to perform all or part of the steps of the method described in the various embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.

In yet another aspect of the present application, there is provided an optical storage system comprising: an optical disc and a reading device. The optical disc is for storing data and the reading means are for performing the relevant steps of the method embodiments described above.

In yet another aspect of the present application, a computer readable storage medium is provided, comprising computer instructions which, when run on a reading device, perform the relevant steps in the method embodiments described above.

In a further aspect of the present application, a computer program product is provided comprising instructions which, when run on a computer device, cause a reading apparatus to perform the relevant steps in the method embodiments described above.

Finally, it should be noted that: the foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (19)

1. A data reading method, characterized in that it is applied in a reading device, said method comprising:

the reading device forms reference images on a plurality of storage layers included in the optical disc;

the reading device scans the reference image on a target storage layer in the plurality of storage layers at a first vertical position to determine a first definition parameter of the reference image;

The reading device scans the reference image on the target storage layer at a second vertical position to determine a second definition parameter of the reference image, wherein the distance between the first vertical position and the second vertical position is smaller than the interval thickness of two adjacent storage layers in the plurality of storage layers;

the reading device determines a third vertical position according to the second vertical position, the first definition parameter, the second definition parameter and the target definition parameter of the target storage layer;

the reading device scans the target storage layer at the third vertical position so as to read target data in the target storage layer.

2. The method of claim 1, wherein the reading means determining a third vertical position based on the second vertical position, the first sharpness parameter, the second sharpness parameter, and the target sharpness parameter of the target storage layer comprises:

the reading device determines an offset direction according to the first definition parameter and the second definition parameter;

the reading device determines an offset distance according to the second definition parameter and the target definition parameter of the target storage layer;

The reading device determines the third vertical position according to the second vertical position, the offset direction and the offset distance.

3. The method of claim 2, wherein the first vertical position is below the second vertical position, wherein the reading device determines an offset direction based on the first sharpness parameter and the second sharpness parameter, comprising:

if the first definition parameter is greater than the second definition parameter, the reading device determines that the offset direction is downward;

and if the first definition parameter is smaller than the second definition parameter, the reading device determines that the offset direction is upward.

4. The method of claim 2, wherein the first vertical position is above the second vertical position, wherein the reading means determines an offset direction based on the first sharpness parameter and the second sharpness parameter, comprising:

if the first definition parameter is greater than the second definition parameter, the reading device determines that the offset direction is upward;

and if the first definition parameter is smaller than the second definition parameter, the reading device determines that the offset direction is downward.

5. The method of any of claims 1-4, wherein the target data comprises a target data block and the reading device scans the target storage layer in the third vertical position, comprising:

the reading device determines a first horizontal position so that the target data block is positioned inside the reference image on the target storage layer;

the reading device scans the target storage layer according to the first horizontal position and the third vertical position.

6. The method of any of claims 1-5, wherein the reference image is rectangular in shape, the target data comprises a target data block, and the reading device scans the target storage layer in the third vertical position, comprising:

the reading means determines a second horizontal position so that four sides of the target data block are respectively parallel to corresponding sides of the four sides of the reference image on the target storage layer.

7. The method of any of claims 1-6, wherein the first vertical position is determined based on a thickness of each of the plurality of storage layers and a number of layers of the target storage layer.

8. The method of any of claims 1-7, wherein the reading device scans the reference image on a target storage layer of the plurality of storage layers in a first vertical position, the method further comprising:

the reading device scans the reference image on the plurality of storage layers to determine a plurality of target sharpness parameters including the target sharpness parameters of the reference image on the target storage layer.

9. The method according to any one of claims 1-8, wherein the reference image is a diaphragm image, the reading device comprising an imaging unit comprising: the light source, the light collecting lens group, the diaphragm and the light collecting lens group are sequentially arranged; the reading apparatus forms a reference image on a plurality of storage layers included in an optical disc, including:

the light emitted by the light source passes through the light collecting lens group, the diaphragm and the light collecting lens group, and forms the diaphragm image on the plurality of storage layers included in the optical disc.

10. A reading device, characterized in that the reading device comprises:

an imaging unit for forming reference images on a plurality of storage layers included in the optical disc;

A reading unit configured to scan the reference image on a target storage layer of the plurality of storage layers at a first vertical position to determine a first sharpness parameter of the reference image;

the reading unit is further configured to scan the reference image on the target storage layer at a second vertical position to determine a second sharpness parameter of the reference image, where a distance between the first vertical position and the second vertical position is smaller than a spacing thickness of two adjacent storage layers in the plurality of storage layers;

the reading unit is further configured to determine a third vertical position according to the second vertical position, the first definition parameter, the second definition parameter, and the target definition parameter of the target storage layer;

the reading unit is further configured to scan the target storage layer at the third vertical position to read target data in the target storage layer.

11. The reading device of claim 10, wherein the reading unit is further configured to:

determining an offset direction according to the first definition parameter and the second definition parameter;

determining an offset distance according to the second definition parameter and the target definition parameter of the target storage layer;

And determining the third vertical position according to the second vertical position, the offset direction and the offset distance.

12. The reading device of claim 11, wherein the first vertical position is below the second vertical position, the reading unit further configured to:

if the first clear parameter is larger than the second clear parameter, determining that the offset direction is downward;

and if the first definition parameter is smaller than the second definition parameter, determining that the offset direction is upward.

13. The reading device of claim 11, wherein the first vertical position is above the second vertical position, the reading unit further configured to:

if the first clear parameter is larger than the second clear parameter, determining that the offset direction is upward;

and if the first definition parameter is smaller than the second definition parameter, determining that the offset direction is downward.

14. The reading device according to any of claims 10-13, wherein the target data comprises a target data block, the reading unit further being configured to:

determining a first horizontal position so that the target data block is located inside the reference image on the target storage layer;

And scanning the target storage layer according to the first horizontal position and the third vertical position.

15. The reading apparatus according to any one of claims 10 to 14, wherein the reference image is rectangular in shape, the target data includes a target data block, and the reading unit is further configured to:

a second horizontal position is determined such that four sides of the target data block are parallel to corresponding sides of the four sides of the reference image on the target storage layer.

16. The reading device of any of claims 10-15, wherein the first vertical position is determined based on a thickness of each of the plurality of storage layers and a number of layers of the target storage layer.

17. The reading device according to any of claims 10-16, wherein the reading unit is further adapted to:

the reference image on the plurality of storage layers is scanned to determine a plurality of target sharpness parameters including the target sharpness parameters of the reference image on the target storage layer.

18. The reading apparatus according to any one of claims 10 to 17, wherein the reference image is a diaphragm image, and the imaging unit includes: the light source, the light collecting lens group, the diaphragm and the light collecting lens group are sequentially arranged;

The light source is used for forming the diaphragm image on the optical disk through the light collecting lens group, the diaphragm and the light collecting lens group.

19. An optical storage system, characterized in that the optical storage system comprises an optical disc and a reading device;

the optical disc is used for storing data;

the reading device is adapted to perform the data reading method according to any of claims 1-9.

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