CN111866419B - Thermal imaging image display method and device and thermal imaging equipment - Google Patents
Thermal imaging image display method and device and thermal imaging equipment Download PDFInfo
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Abstract
The embodiment of the invention provides a thermal imaging image display method, a device and thermal imaging equipment, wherein the method comprises the following steps: acquiring a preset number of image files from storage equipment, and storing the image files in a preset cache region, wherein the image files in the cache region are sequenced according to a specified sequence; reading the image file from the cache region for display; when a user views the displayed image files in the same order or the reverse order of the designated order, if the image files to be viewed are not judged in the cache region in advance, the next batch of image files with the preset number are obtained from the storage device to update the cache region.
Description
Technical Field
The invention relates to the technical field of image processing, in particular to a thermal imaging image display method and device and thermal imaging equipment.
Background
The thermal imaging device is mainly used for research and development or industrial detection and equipment maintenance, and also has wide application in fire prevention, night vision and security. The thermal imaging device can utilize an infrared detector and an optical imaging objective lens to receive an infrared radiation energy distribution pattern of a detected object and reflect the infrared radiation energy distribution pattern on a photosensitive element of the infrared detector, so that an infrared thermal imaging image is obtained, and the thermal imaging image corresponds to a thermal distribution field on the surface of an object. Thermal imagers, by its most popular means, convert the invisible infrared energy emitted by an object into a visible thermal image. The different colors on the top of the thermographic image may represent different temperatures of the object under test.
In the thermal imaging apparatus, functions such as scene capture, thermal imaging image preview, and the like need to be satisfied. In order to facilitate the user to read the stored image, the snapshot image is stored in the SD card; the user can view, switch, delete and the like the thermal imaging image which is captured and stored through the thermal imaging device. However, since the image file corresponding to the thermal imaging image is large, the image file is read from the SD card each time before the thermal imaging image is viewed, and the response speed is slow.
Disclosure of Invention
In order to overcome the problems in the related art, the invention provides a thermal imaging image display method, a thermal imaging image display device and a thermal imaging device.
According to a first aspect of embodiments of the present invention, there is provided a method of displaying a thermal imaging image, including:
acquiring a preset number of image files from storage equipment, and storing the image files in a preset cache region, wherein the image files in the cache region are sequenced according to a specified sequence;
reading the image file from the cache region for display;
when a user views the displayed image files in the same order or the reverse order of the designated order, if the image files to be viewed are not judged to be in the cache region in advance, acquiring the next batch of preset number of image files from the storage device so as to update the cache region.
In one embodiment, the determining process for predicting that the image file to be viewed is not in the buffer area comprises:
viewing the image files in the reverse order of the specified order, if the first marked image file in the cache region is displayed; or, the image files are viewed according to the same sequence of the specified sequence, if the second marked image file is displayed in the cache region, the image file to be viewed is determined not to be in the cache region, and the first marked image file or the second marked image file is the last image file displayed.
In one embodiment, the obtaining the next predetermined number of image files from the storage device includes:
reading a first predetermined number of image files that have been cached in the cache area and a second predetermined number of image files that have not been cached in the cache area from the storage device in a predetermined number.
In one embodiment, the process of reading a first predetermined number of image files that have been cached in the cache area from a storage device comprises:
reading a first predetermined number of image files including the second marked image file when the image files are viewed in the same order of the designated order; or
When the image files are viewed in the reverse order of the designated order, a first predetermined number of image files including the first tagged image file are read.
In one embodiment, the process of reading a second predetermined number of image files from the storage device that are not cached in the cache area comprises:
if the total number of the image files which are not cached in the cache area by the storage device is less than the second preset number, reading all the image files which are not cached in the cache area from the storage device, and reading the residual number of the image files from the cached image files.
In one embodiment, the reading the image file from the buffer area for display includes:
reading the selected image file from the cache region, and decoding to obtain a thermal imaging image in a JPEG format;
converting the thermal imaging image in JPEG format into a thermal imaging image in YUV420 format;
converting the thermal imaging image in YUV420 format into a thermal imaging image in RGB888 format;
the thermographic image in RGB888 format is converted to a thermographic image in RGB1555 format and the thermographic image in RGB1555 format is displayed.
According to a second aspect of embodiments of the present invention, there is provided a display device of a thermal imaging image, comprising:
a cache update module to: acquiring a preset number of image files from storage equipment, and storing the image files in a preset cache region, wherein the image files in the cache region are sequenced according to a specified sequence;
an image display module to: reading the image file from the cache region for display;
the cache update module is further configured to: when a user views the displayed image files in the same order or the reverse order of the designated order, if the image files to be viewed are not judged to be in the cache region in advance, acquiring the next batch of preset number of image files from the storage device so as to update the cache region.
In one embodiment, the process of the cache update module for predicting that the image file to be viewed is not in the cache area includes:
viewing the image files in the reverse order of the specified order, if the first marked image file in the cache region is displayed; or, the image files are viewed according to the same sequence of the specified sequence, if the second marked image file is displayed in the cache region, the image file to be viewed is determined not to be in the cache region, and the first marked image file or the second marked image file is the last image file displayed.
In one embodiment, the cache update module obtaining the next predetermined number of image files from the storage device includes:
reading a first predetermined number of image files that have been cached in the cache area and a second predetermined number of image files that have not been cached in the cache area from the storage device in a predetermined number.
In one embodiment, the process of the cache update module reading a first predetermined number of image files that have been cached in the cache area from a storage device comprises:
reading a first predetermined number of image files including the second marked image file when the image files are viewed in the same order of the designated order; or
When the image files are viewed in the reverse order of the designated order, a first predetermined number of image files including the first tagged image file are read.
In one embodiment, the process of the cache update module reading a second predetermined number of image files from the storage device that are not cached in the cache area comprises:
if the total number of the image files which are not cached in the cache area by the storage device is less than the second preset number, reading all the image files which are not cached in the cache area from the storage device, and reading the residual number of the image files from the cached image files.
In one embodiment, the image display module is to:
reading the selected image file from the cache region, and decoding to obtain a thermal imaging image in a JPEG format;
converting the thermal imaging image in JPEG format into a thermal imaging image in YUV420 format;
converting the thermal imaging image in YUV420 format into a thermal imaging image in RGB888 format;
the thermographic image in RGB888 format is converted to a thermographic image in RGB1555 format and the thermographic image in RGB1555 format is displayed.
According to a third aspect of embodiments of the present invention, there is provided a thermal imaging apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements any of the above methods when executing the program.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
in this embodiment, a buffer area is preconfigured, a predetermined number of image files obtained from a storage device are stored in a preset buffer area, the image files can be read from the buffer area and displayed, and the refresh time delay when the images are read is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow chart illustrating a method of displaying a thermographic image according to an exemplary embodiment of the present invention.
FIG. 2 is a diagram illustrating a start and end calculation process according to an exemplary embodiment of the present invention.
FIG. 3 is a flow chart illustrating another method of displaying a thermographic image according to an exemplary embodiment of the present invention.
Fig. 4 is a hardware configuration diagram of a computer apparatus in which the thermal imaging image display device of the present invention is located.
Fig. 5 is a block diagram of a thermal imaging image display apparatus according to an exemplary embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The thermal imaging device may be called a thermal imager, an infrared thermal imager, or the like, and is a device for performing photosensitive imaging on infrared rays emitted from an object. The thermographic image is an image generated by a thermographic device, which may also be referred to as thermography for short. In the thermal imaging apparatus, it is necessary to satisfy functions such as scene capture, thermal imaging image preview, and the like. In order to facilitate the user to read the saved image, the snapshot image is saved in a storage device (such as an SD card); the user can view, switch, delete and the like the thermal imaging image which is captured and stored through the thermal imaging device. However, since the picture file corresponding to the thermal imaging image is large, the response speed is slow when the picture file is read from the storage device before the thermal imaging image is viewed each time.
Based on this, the embodiment of the invention provides a thermal imaging image display scheme, which can reduce the time delay when an image is read and improve the response speed. Embodiments of the present invention are described below with reference to the accompanying drawings.
As shown in fig. 1, a flow chart of a method for displaying a thermal imaging image according to an exemplary embodiment of the present invention is shown, the method comprising:
in step 102, acquiring a predetermined number of image files from a storage device, and storing the image files in a preset cache region, wherein the image files in the cache region are ordered according to a designated sequence;
in step 104, reading the image file from the buffer area for display;
in step 106, when the user views the displayed image files in the same order or the reverse order of the designated order, if it is predicted that the image files to be viewed are not in the cache region, the next predetermined number of image files are acquired from the storage device to update the cache region.
The present embodiments may be applied to a thermal imaging device, which is a device capable of displaying a thermal imaging image, and in one example, the thermal imaging device may be a low performance thermal imaging device, such as a low end handheld thermal imager.
The thermographic image is stored in the storage device in the form of an image file. For example, the image file may be an encoded file of a thermal imaging image, such as a picture in a pure JPEG format, and at this time, the thermal imaging image can be obtained by decoding the image file by using a corresponding decoding method. The image file can also be a file with attached thermal imaging data, and the thermal imaging image is generated by analyzing the image file by using algorithms such as temperature measurement and the like. The image file may also be a video file, with the thermographic video being obtained by decoding the image file. It is understood that the present embodiment does not limit the image file, and may be a file in which one or more frames of the thermal imaging image to be displayed are stored in the storage device in a certain file requirement as required. The storage device is a device for storing image files, and for example, the storage device may be an external memory such as a magnetic disk, an optical disk, an SD card, a hard disk, and a cloud storage.
The efficiency of reading the file from the storage device is lower than that of reading the file from the buffer area, and for this reason, a buffer area is preconfigured in the embodiment, and a part of the image file in the storage device can be buffered in the preconfigured buffer area. The image files in the buffer area can be directly displayed without being read from the storage device every time, and the image display switching efficiency is improved. The buffer may also be referred to as an image buffer, Buf, etc.
The embodiment may acquire a predetermined number of image files from the storage device, and store the image files in a preset buffer area, where the image files in the buffer area are sorted in a designated order.
In one embodiment, the total number of image files to be cached in the cache region may be predetermined in advance, for example, the predetermined number may be denoted by n. The predetermined number may be less than or equal to the total number BufSize of image files that can actually be cached in the cache area. In order to improve the utilization rate of the cache region, the predetermined number may be the total number of image files that can be actually cached by the cache region.
The designated order is an arrangement order of the image files designated in advance. For example, the specified order may be sorted from newest to oldest in time, sorted from oldest in time to newest in time, sorted by file size to small size, sorted by file size to large size, and the like. The designated order may be a default order or may be determined by a user-selected ordering. The specified order may be a default order if the user does not select a sort mode, and may be dependent on the sort mode selected by the user if the user selects a sort mode. Since the storage device is often stored according to the requirements of the file system, the image files stored in the storage device may be ordered or unordered, and after a predetermined number of image files are obtained from the storage device, the read image files need to be sorted to realize that the image files in the cache region are sorted according to the designated order.
For example, when reading an image file in a storage device, the image file can be read according to a pre-established linked list. The linked list is made up of a series of nodes (each element in the linked list is called a node), each node comprising two parts: one is a data field for storing file information and the other is a pointer field for storing the address of the next node. In this embodiment, the linked list plays an index role, so that the corresponding image file can be acquired based on the linked list. The linked list may be generated in a default sorting manner before the image file is read from the storage device for the first time, or generated in a sorting manner selected by the user when the user switches the sorting manner of the image, or may be updated when the operations of adding, deleting, etc. the image file are executed in the storage device. Therefore, a part of ordered image files with the specified sequence relation can be read by using the linked list as the index table.
When reading image files from the storage device to the buffer area for the first time, a predetermined number of image files may be read into the buffer area according to a designated order, thereby obtaining an ordered set of image files.
After caching a predetermined number of image files in the cache region, if the image files need to be displayed, the image files can be directly read from the cache region to be displayed. On the screen, one or more image files may be presented, and when one image file is presented, the thermographic image generated from the image file may be displayed directly. When multiple image files are exposed, a file identification or file summary for the pointer image file may be displayed. For example, in one example, a thermographic image obtained from an image file may be displayed directly, and the user may toggle to view the next image file by sliding or pressing a key, etc. In another example, the user is presented with a list of images for selecting image files to view. The image list may include a file identifier or a file summary for identifying the image file, and the file identifier or the file summary may uniquely identify the image file, and may be information such as text and image, so as to assist the user to know the image file to which the image file refers. Reading the image file from the buffer area for display may include: and under the condition that the target file identifier in the image list is selected, reading the image file corresponding to the target file identifier from the cache region, and displaying the thermal imaging image by using the read file information.
It is understood that, how to display the thermal image from the image file can refer to the related art, and the details are not repeated herein. In one embodiment, a means for improving the efficiency of picture conversion is provided, and the reading of the image file from the buffer area for display includes:
reading the selected image file from the cache region, and decoding to obtain a thermal imaging image in a JPEG format;
converting the thermal imaging image in JPEG format into a thermal imaging image in YUV420 format;
converting the thermal imaging image in YUV420 format into a thermal imaging image in RGB888 format;
the thermographic image in RGB888 format is converted to a thermographic image in RGB1555 format and the thermographic image in RGB1555 format is displayed.
In this embodiment, if an image is displayed on the device screen, an RGB format picture is required. Then, the present embodiment may convert the JPEG format picture already saved in the storage device into an RGB format picture for display on the device screen. The JPEG format is firstly converted into the YUV420 format, then the RGB888 format is converted, and finally the RGB1555 format is converted, so that the picture conversion efficiency is improved.
Since the number of image files cached in the cache region is limited, in order to enable the image files that the user desires to view to be directly read from the cache region, the present embodiment may configure the cache update condition. And under the condition that the cache updating condition is met, acquiring a next batch of preset number of image files from the storage device to update the cache region. The cache update condition is a condition for triggering execution of a cache region update operation, and in one embodiment, when the user views the displayed image files in the same order or the reverse order of the specified order, if it is judged that the image file to be viewed is not in the cache region in advance, it is judged that the cache update condition is satisfied. The image file to be viewed may be some satisfactory image file that is pre-designated to trigger a cache update. For example, the image file to be viewed may be the next image file to be viewed, or other image files to be viewed.
In the embodiment, whether the image files to be checked are in the cache is judged in advance, and if the image files to be checked are not in the cache area, the next batch of image files with the preset number are obtained from the storage device, so that the cache can be updated in advance, and the situation that the image files to be checked are not in the cache area and are blocked is avoided.
Regarding how to predict whether an image file to be viewed is in the buffer, for example, whether an image file to be viewed is in the buffer may be predicted by whether a marked image file is displayed. In practical applications, although the arrangement of the image displays is determined, the user may view the images sequentially or reversely. For example, taking the example of moving a cursor by a key, the user may select to view backward or to view forward. As another example, taking a touch screen swipe as an example, the user may choose to swipe forward or backward to view different image files. The appointed sequence is from newest to oldest in time, and when the user views the image files in the same sequence, the sequence of currently viewed images is from newest to oldest in time; when the user views the image files in reverse order, the order in which the images are currently viewed is from oldest to newest.
In view of this, two image files may be marked, and at the same time, the order in which the user views the files is combined to determine which marked image file to use to prejudge whether the image file to be viewed is in the buffer. Since the cache is triggered to update when the marked image file is displayed, the marked image file is the last image file displayed. For the sake of distinction, an image file that triggers updating when the image files are viewed in the reverse order of the designated order is referred to as a first tagged image file, and an image file that triggers updating when the image files are viewed in the same order of the designated order is referred to as a second tagged image file. For this reason, the process of predicting that the image file to be viewed is not in the buffer area may include:
viewing the image files in the reverse order of the specified order, if the first marked image file in the cache region is displayed; or, the image files are viewed according to the same sequence of the specified sequence, if the second marked image file is displayed in the cache region, the image file to be viewed is determined not to be in the cache region, and the first marked image file or the second marked image file is the last image file displayed.
And how to specify the first tagged image file and the second tagged image file in the cache may be set as desired. For example, the first tagged image file and the second tagged image file may be boundary image files, i.e., sorted image files in the buffer, and the number of image files arranged between the first tagged image file and the second tagged image file is a predetermined number minus 2. The first tagged image file satisfies: the image files arranged in the specified order before the first marked image file are not in the buffer. The second tagged image file satisfies: the image files arranged in the specified order after the second tagged image file are not in the buffer. Therefore, in this embodiment, the first tagged image file may also be referred to as a start image file in the buffer, and the second tagged image file may also be referred to as an end image file in the buffer.
In the embodiment, the image files are checked in the reverse order of the designated order, and if the first marked image file in the cache region is displayed, the image file to be checked is judged not to be in the cache region; and viewing the image files in the same order of the specified order, and if the second marked image file in the cache region is displayed, judging that the image file to be viewed is not in the cache region. And the displayed image file may be a thermal imaging image corresponding to the image file (e.g., the image file has been viewed by a user by clicking, etc.), or a file identifier or a file summary corresponding to the image file. The embodiment takes the boundary image file as the marked image file, so that the updating frequency of the cache region can be reduced, the cache can be updated before the user views the image file to be viewed, and the user can not be jammed in browsing.
It is understood that, in other embodiments, the marked image file may also be an image file adjacent to the boundary image file, for example, if the number of image files arranged between the first marked image file and the second marked image file is a predetermined number minus R, where R is greater than 2, it may be determined whether the next image files to be viewed are in the buffer.
In some application scenarios, the user may not view the image files in sequence, but instead view the image files at intervals or jumps, and it may happen that the image file is just jumped over the first tagged image file or the second tagged image file, for which purpose, in one embodiment, the method further comprises: and when the image files requested to be displayed are not in the cache region, acquiring the next batch of preset number of image files from the storage device so as to update the cache region. The image file requested to be displayed is not in the cache region, which may be the case that the file identifier/file summary corresponding to the image file does not exist in the image list, or the image file corresponding to the selected file identifier/file summary is not in the cache region, and the like, is abnormally displayed. According to the embodiment, when the image file requested to be displayed is not in the cache area, the cache area is triggered to be updated, cache updating is triggered under various conditions, and more scenes can be handled.
It is understood that other update triggering conditions may be included, and are not described in detail herein.
Next, an example of how to acquire the next predetermined number of image files from the storage device will be described.
And updating the cache region to enable the updated cache region to cache a new image file which is expected to be viewed by the user, so that when the user selects the image file which is expected to be viewed, the image file can be directly read from the cache region and displayed. To this end, in one embodiment, the next predetermined number of acquired image files includes at least the image files to be viewed.
For example, the next predetermined number of image files may be a predetermined number of ordered sets of image files read from the storage device, and the ordered sets of image files are a predetermined number of image files in a specified order starting with the next image file to be viewed.
This embodiment directly takes a predetermined number of image files starting from the next image file to be viewed as image files to be updated, and more uncached image files can be obtained.
For the case that the cache update condition is that the image file requested to be displayed is not in the cache region, the obtaining of the next predetermined number of image files from the storage device may be obtaining a predetermined number of image files containing the requested image file that are not cached in the cache region.
In some application scenarios, a user may have a need to review an image, and if an uncached image file is directly used to replace a cached image file, it may happen that a cache area is just updated soon, and a first marked image file is displayed due to review by the user, thereby triggering the cache to update again. It can be seen that since review by the user triggers a cache update again, the frequency of cache updates is increased, and in view of this, in one embodiment, the next predetermined number of image files comprises: a first predetermined number of image files that have been cached in the cache area and a second predetermined number of image files that are not cached in the cache area. Correspondingly, the obtaining of the next predetermined number of image files from the storage device includes: reading a first predetermined number of image files that have been cached in the cache area and a second predetermined number of image files that have not been cached in the cache area from the storage device in a predetermined number.
The sum of the first predetermined number and the second predetermined number is a predetermined number, and values of the first predetermined number and the second predetermined number can be set according to requirements. For example, the first predetermined amount and the second predetermined amount may be set in a fixed ratio, such as 1/2 where each of the first predetermined amount and the second predetermined amount is a predetermined amount.
For example, the first predetermined number is set to be smaller than the second predetermined number in consideration of a high possibility that the user views a new image file.
For example, the first predetermined number and the second predetermined number may be set according to actual situations, for example, the first predetermined number and the second predetermined number may be determined according to the review frequency of the user. If the review frequency of the user is low, the number of last cached image files in the updated cache region is smaller than the number of last uncached image files, so that the uncached image files viewed by the user are more than the cached image files, namely the first predetermined number is smaller than the second predetermined number. If the review frequency of the user is higher, the number of last cached image files in the updated cache region is greater than or equal to the number of last uncached image files, so that the cached image files viewed by the user are equal to or more than the uncached image files, namely the first predetermined number is greater than or equal to the second predetermined number.
In this embodiment, the updated buffer includes: and a part of image files cached in the current cache region and a part of image files not cached in the current cache region, therefore, no matter a user looks forward or backward at the image files, cache updating can not be triggered immediately, and frequent cache updating caused by looking forward or backward at the image is avoided.
In view of the above, in order to avoid frequent cache updating caused by viewing an image forward or backward, in one embodiment, the updated cache region may include: a requested image file and image files arranged before and after the requested image file.
In this embodiment, the updated cache region includes: a part of the image files arranged before the image file requested to be displayed and a part of the image files arranged after the image file requested to be displayed are arranged, so that the cache update is not immediately triggered regardless of whether the user views the image files forward or backward, thereby reducing the cache update frequency.
In one embodiment, the viewing order is also factored when reading image files from the storage device. For example, the process of reading a first predetermined number of image files that have been cached in the cache area from a storage device includes:
reading a first predetermined number of image files including the second marked image file when the image files are viewed in the same order of the designated order; or
When the image files are viewed in the reverse order of the designated order, a first predetermined number of image files including the first tagged image file are read.
In this embodiment, if the user views the image files in the same order of the designated order, a first predetermined number of image files including the second tagged image file may be read, for example, the image files that have been cached in the cache area and are to be read this time are estimated from the second tagged image file and the first predetermined number along the reverse direction of the designated order. Correspondingly, the image files which are not cached in the cache region and are to be read at this time can also be estimated from the second marked image files and the second predetermined number along the same sequence direction of the specified sequence.
A first predetermined number of image files including the first tagged image file may be read if the user views the image files in a reverse order of the specified order. For example, the image files cached in the cache area to be read at this time are estimated from the first marked image file and the first predetermined number along the same sequence direction of the specified sequence. Correspondingly, the image files to be read at this time and not cached in the cache region can also be estimated from the first marked image files and the second predetermined number along the reverse direction of the specified sequence.
As to how to determine the next predetermined number of image files, a specific example is illustrated, the image files in the storage device may be numbered in the designated order, the numbers of all the image files in the next predetermined number of image files may be determined by determining the number of the first tagged image file and the number of the second tagged image file in the next predetermined number of image files, and the next predetermined number of image files may be obtained from the storage device according to the numbers and the index table. Wherein the first tagged image file satisfies: the image files arranged before the first tagged image file in the specified order are not in the buffer, and the second tagged image file satisfies: the image files arranged in the designated order after the second tagged image file are not in the buffer.
For example, suppose that the image files in the storage device are numbered in the specified order and the sequence number ranges of the image files are: [1, N ], calculating the sequence number range of the image files cached in the updated cache region by adopting the following formula;
if it is
Then:
the sequence number range of the image files cached in the cache area after updating is as follows: [ start, end ]]；
If it is
Then:
the sequence number range of the image files cached in the cache area after updating is as follows: [ start, end ]]；
Wherein, start is the number of a first marked image file in the next image file, end is the number of a second marked image file in the next image file, select represents the sequence number of the first marked image file or the second marked image file displayed in the current cache region, and BufSize represents the total number of the image files cached in the cache region. In order to ensure that a first predetermined number of image files already cached in the buffer and a second predetermined number of image files not cached in the buffer can be read, when the user views the displayed image files in the same order of the specified order, k represents a ratio of the image files already cached in the buffer to the predetermined number in the next predetermined number of image files. When the user views the displayed image files in the reverse order of the designated order, k represents the ratio of image files not cached in the cache region to the predetermined number in the next predetermined number of image files.
In practical applications, an abnormal situation may also occur, for example, the total number of image files that are not cached in the cache area in the storage device is less than the second predetermined number, and the number of acquired image files may be less than the predetermined number, and in view of this, in an embodiment, the process of reading the second predetermined number of image files that are not cached in the cache area from the storage device may include:
if the total number of image files not cached in the cache area in the storage device is less than the second predetermined number, reading all the image files not cached in the cache area from the storage device, and reading the remaining number of image files from the cached image files.
When the total number of the image files which are not cached in the cache region in the storage device is found to be less than the second preset number, the embodiment reads the remaining number of image files from the cached image files again, and realizes cyclic reading, so that the specified number of image files can be acquired each time.
Assuming that the sequence number range of the image files after the image files in the storage device are numbered according to the specified sequence is as follows: [1, N ], calculating the sequence number range of the image files cached in the updated cache region by adopting the following formula;
if it is
Then:
post-update cache region cachingThe sequence number range of the image file is: [1, end]And [ start, N ]]；
If it is
Then:
the sequence number range of the image files cached in the cache area after updating is as follows: [1, end]And [ start, N ]]；
Wherein, start is the number of a first marked image file in the next image file, end is the number of a second marked image file in the next image file, select represents the sequence number of the first marked image file or the second marked image file displayed in the current cache region, and BufSize represents the total number of the image files cached in the cache region. In order to ensure that a first predetermined number of image files already cached in the buffer and a second predetermined number of image files not cached in the buffer can be read, when the user views the displayed image files in the same order of the specified order, k represents a ratio of the image files already cached in the buffer to the predetermined number in the next predetermined number of image files. When the user views the displayed image files in the reverse order of the designated order, k represents the ratio of image files not cached in the cache region to the predetermined number in the next predetermined number of image files. When updating the buffer Buf, the image file of [1, end ] may be stored in the buffer first, and then the file of [ start, N ] may be stored in the buffer, so as to form a complete cyclic buffer, that is: [ start, end ].
Various technical features in the above embodiments can be arbitrarily combined, so long as there is no conflict or contradiction between the combinations of the features, but the combination is limited by the space and is not described one by one, and therefore, any combination of various technical features in the above embodiments also belongs to the scope of the disclosure.
The combined embodiments are illustrated below with a specific example.
In this embodiment, a buffer Buf of the size BufSize may be constructed. BufSize is the total number of cached image files. The storage device is an SD card. The device presents the image files in the form of an image list Display, which contains a file summary identifying the image files. The image list may include file summaries of m image files, and the value of m is set according to requirements. In one example, the number of thumbnails or the number of file names that can be displayed at most in one screen, or the like may be possible. For example, in an economical device, a list containing 6 picture names may be displayed, and in this case, m may take a value of 6. For another example, in a professional device, the LCD can display a thumbnail of 12 pictures at most on a large screen, and m may be 12. Assuming that each file summary is a line, the image list may include m lines, the first line being a filehead, and the cursor selecting the line Index as select. The number of the first marked image file in the cache area Buf is start, and the number of the second marked image file is end; all the picture files in the SD card are SDfiles, and the total number of the picture files is N. When the device displays, the image files need to be sorted according to a specified sequence (such as sorting from newest time to oldest or sorting from oldest time to newest), while the image files in the SD card are sorted according to a system sorting mode, which may not be consistent with the specified sequence, so Buf needs to realize file sorting on the SDfiles.
FIG. 2 is a schematic diagram illustrating a start and end calculation process according to an exemplary embodiment of the present invention, as shown in FIG. 2. This embodiment relates to the image list, the buffer Buf, and the SD card displayed on the device. The user can move the cursor by pressing keys and the like to select the image file to be viewed, and when the 'confirm' key is clicked, the image file indicated by the line where the cursor is located is read from the buffer and displayed as a thermal imaging image. The image files shown in the image list are in the buffer, and all the image files in the buffer belong to the subset of the image files in the SD card, so m < BufSize < N. The number of the first tagged image file and the number of the second tagged image file in the next image file may be calculated using the following formulas:
however, the number of the first tagged image file and the number of the second tagged image file may be out of range, i.e., the case
Or
For this reason, the start and end are calculated for the out-of-range case using the following equations:
if it is
Then:
(this formula may also be called an out-of-bounds formula for calculating start), the sequence number range of the image file cached in the cache area after updating is: [1, end]And [ start, N ]]；
If it is
Then:
(this formula may also be called a cross-border formula for calculating end), the sequence number range of the image file cached in the cache area after updating is: [1, end]And [ start, N ]]。
Fig. 3 is a flow chart illustrating another method of displaying a thermographic image according to an exemplary embodiment of the present invention.
S302, firstly, the buffer area is initialized and updated.
For example, when reading image files from the SD card for the first time, all image files in the SD card are numbered in a designated order, such as [1, N ], and all image files are sorted in a linked list manner, so that the storage path of the image file corresponding to the number in the SD card can be obtained from the linked list according to the number. In one example, the first line filehead and select may be initialized to the first number. For example, the first line filehead is initialized to 1, and the number select of the image file indicated by the line selected by the cursor is initialized to 1. It is understood that the first line filehead and select may be initialized to other designated numbers, not listed here.
filehead＝1
select＝1
Due to the fact that
Then the formula for calculating start needs to adopt the out-of-range formula:
for example, if N is 100, BufSize is 10, m is 6, and k is 1/2, the image file is read for the first time
After the numbers of the first marked image file and the second marked image file in the next image file are determined, the numbers of other files to be read can be determined, and the image files corresponding to the numbers are read from the SD card according to the linked list. When the image file is stored in the buffer Buf, [1, end ] can be stored first]The file(s) is/are stored in the cache first, and then [ start, N ] is/are stored in the cache]The files are stored in the cache to form a complete circular cache, and then the sequence of the image files in the cache region is as follows: [1,2,3,4,5,6,97,98,99,100]。
S304, judging whether the boundary condition of the Buf updating is met currently.
For example, the boundary condition may be select start or select end, which indicates that the current cache Buf needs to be updated when the select line select of the cursor is equal to the first tagged image file start in the current cache region or the second tagged image file end in the current cache region.
start or end of a selection
S306, calculating the start and the end, and processing the start and the end exception.
New values of the first marker image file start and the second marker image file end in all files in the SD card are recalculated. Still taking the above specific example as an example, assuming that the cursor is moved downwards, when the select ═ end ═ 6 of the line where the cursor is located, it indicates that if the user looks down again, the next image file numbered 7 is not in the buffer, so start and end are recalculated using the following formulas;
and S308, reading the image file from the SD card, and updating the image file to the Buf cache.
Reading image files corresponding to the numbers 2 to 11 from the SD card according to the linked list, and updating the image files to a cache region, wherein the sequence of the image files in the cache region is as follows: [2,3,4,5,6,7,8,9,10,11]
The mapping relation between the image files in the cache area and the image files in the SD card is as follows:
Buf[i]＝SDfiles[j]
buf [ i ] represents the ith image file arranged in the cache region, and SDfiles [ j ] represents the image file with the number of j in the SD card. The value range of i is as follows: i is more than 0 and less than or equal to BufSize, and aiming at the value range of j, j is more than or equal to start and less than or equal to end under the condition that start and end do not cross the boundary, j is more than or equal to 1 and less than or equal to end and j is more than or equal to start and less than or equal to N under the condition that start or end cross the boundary.
And S310, updating the Display list.
After updating the cache Buf, the Display list displayed on the screen can be refreshed according to the moving operation of the user on the list, the Display and reading of all files of the SD card are successfully completed, and the mapping relation between the image files in the Display list and the image files in the cache area is as follows without considering the condition that the start or the end is out of range:
Display[k]＝Buf[filehead-start+k](1≤k≤6)
display [ k ] represents the k-th image file arranged in the Display list, filehead represents the number of the first image file arranged in the Display list, start represents the number of the first marked image file in the current cache area, and Buf [ filehead-start + k ] represents the [ filehead-start + k ] th image file arranged in the cache area.
And S312, previewing the selected image.
And when the user selects the file abstract of the image file in the Display list, reading the image file corresponding to the file abstract from the buffer area, and displaying the thermal imaging image.
By applying the embodiment of the specification, in the thermal imaging low-end handheld thermal imager with limited hardware resources, the performance of equipment for previewing pictures is improved through the design mode of picture caching, the refreshing time delay during picture switching is reduced, and the use experience of a user is improved. All pictures in the SD are circularly switched and displayed, so that files can be ordered according to a specified sequence (for example, ordered from latest file time to oldest), and a user can conveniently browse and position the pictures. Further, when displayed on the screen of the device, it is assumed that RGB format pictures are required. Therefore, the JPEG format picture already stored in the SD card can be converted into an RGB format picture for display on the device screen. In order to improve the image conversion efficiency, the JPEG format is converted into the YUV420 format, then the RGB888 format is converted, and finally the RGB1555 format is converted. Therefore, the thermal imaging snapshot picture in the JPEG format stored in the SD can be displayed on the screen of the equipment through rapid format conversion, and a client can conveniently and visually check and operate.
The invention also provides embodiments of the thermal imaging image display device and the electronic equipment applied by the thermal imaging image display device, corresponding to the embodiments of the thermal imaging image display method.
Embodiments of the thermographic image display apparatus of the present invention may be applied to computer equipment. The apparatus embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. The software implementation is taken as an example, and is formed by reading corresponding computer program instructions in the nonvolatile memory into the memory for running through the processor of the computer device where the software implementation is located as a logical means. From a hardware aspect, as shown in fig. 4, the hardware structure of the computer device in which the thermal imaging image display apparatus of the present invention is located is shown, except for the processor 410, the network interface 420, the memory 430, and the nonvolatile memory 440 shown in fig. 4, in the embodiment, the computer device in which the thermal imaging image display apparatus 431 is located may also include other hardware according to the actual function of the device, which is not described again.
As shown in fig. 5, there is a block diagram of a thermal imaging image display apparatus according to an exemplary embodiment of the present invention, the apparatus including:
a cache update module 52 configured to: acquiring a preset number of image files from storage equipment, and storing the image files in a preset cache region, wherein the image files in the cache region are sequenced according to a specified sequence;
an image display module 54 configured to: reading the image file from the cache region for display;
the cache update module is further configured to: when a user views the displayed image files in the same order or the reverse order of the appointed order, if the image files to be viewed are not judged in the cache region in advance, the next batch of image files with the preset number are obtained from the storage device so as to update the cache region.
In one embodiment, the process of the cache update module 52 predicting that the image file to be viewed is not in the cache area includes:
viewing the image files in the reverse order of the specified order, if the first marked image file in the cache region is displayed; or, the image files are viewed according to the same sequence of the specified sequence, if the second marked image file is displayed in the cache region, the image file to be viewed is determined not to be in the cache region, and the first marked image file or the second marked image file is the last image file displayed.
In one embodiment, the cache update module 52 obtaining the next predetermined number of image files from the storage device includes:
reading a first predetermined number of image files that have been cached in the cache area and a second predetermined number of image files that have not been cached in the cache area from the storage device in a predetermined number.
In one embodiment, the process of the cache update module 52 reading a first predetermined number of image files that have been cached in the cache area from a storage device includes:
reading a first predetermined number of image files including the second marked image file when the image files are viewed in the same order of the designated order; or
When the image files are viewed in the reverse order of the specified order, a first predetermined number of image files including the first marked image file are read.
In one embodiment, the process of the cache update module 52 reading a second predetermined number of image files from the storage device that are not cached in the cache area includes:
if the total number of the image files which are not cached in the cache area by the storage device is less than the second preset number, reading all the image files which are not cached in the cache area from the storage device, and reading the residual number of the image files from the cached image files.
In one embodiment, the image display module 54 is configured to:
reading the selected image file from the cache region, and decoding to obtain a thermal imaging image in a JPEG format;
converting the thermal imaging image in JPEG format into a thermal imaging image in YUV420 format;
converting the thermal imaging image in YUV420 format into a thermal imaging image in RGB888 format;
converting the thermographic image in RGB888 format to a thermographic image in RGB1555 format, and displaying the thermographic image in RGB1555 format.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the invention. One of ordinary skill in the art can understand and implement it without inventive effort.
Accordingly, embodiments of the present invention further provide a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above methods when executing the program.
The embodiments of the present invention are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Correspondingly, the embodiment of the invention also provides a computer storage medium, wherein the storage medium stores program instructions, and the program instructions are used for realizing the method.
Embodiments of the invention may take the form of a computer program product embodied on one or more storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having program code embodied therein. Computer-usable storage media include permanent and non-permanent, removable and non-removable media, and information storage may be implemented by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of the storage medium of the computer include, but are not limited to: phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technologies, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic tape storage or other magnetic storage devices, or any other non-transmission medium, may be used to store information that may be accessed by a computing device.
Other embodiments of the present invention will readily suggest themselves to such skilled persons having the benefit of this disclosure as well as the practice of the invention as claimed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method of displaying a thermographic image comprising:
acquiring a preset number of image files from storage equipment, and storing the image files in a preset cache region, wherein the image files in the cache region are sequenced according to a specified sequence;
reading the image file from the cache region for display;
when a user views the displayed image files in the same order or the reverse order of the designated order, if the image files to be viewed are not judged to be in the cache region in advance, acquiring the next batch of image files with a preset number from the storage device so as to update the cache region;
the acquiring of the next predetermined number of image files from the storage device includes:
reading a first preset number of image files which are cached in the cache region and a second preset number of image files which are not cached in the cache region from the storage device according to the preset number, wherein if the total number of the image files which are not cached in the cache region by the storage device is less than the second preset number, reading all the image files which are not cached in the cache region from the storage device, and reading the residual number of the image files from the cached image files.
2. The method of claim 1, wherein the step of predicting that the image file to be viewed is not in the buffer comprises:
viewing the image files in the reverse order of the specified order, if the first marked image file in the cache region is displayed; or, the image files are viewed according to the same sequence of the specified sequence, if the second marked image file is displayed in the cache region, the image file to be viewed is determined not to be in the cache region, and the first marked image file or the second marked image file is the last image file displayed.
3. The method of claim 1, wherein reading the first predetermined number of image files that have been cached in the cache area from the storage device comprises:
reading a first predetermined number of image files including a second marked image file when the image files are viewed in the same order of the designated order; or
When the image files are viewed in the reverse order of the designated order, a first predetermined number of image files including a first tagged image file are read.
4. The method according to any one of claims 1 to 3, wherein the reading the image file from the buffer area for display comprises:
reading the selected image file from the cache region, and decoding to obtain a thermal imaging image in a JPEG format;
converting the thermal imaging image in JPEG format into a thermal imaging image in YUV420 format;
converting the thermal imaging image in YUV420 format into a thermal imaging image in RGB888 format;
the thermographic image in RGB888 format is converted to a thermographic image in RGB1555 format and the thermographic image in RGB1555 format is displayed.
5. A display device for thermal imaging images, comprising:
a cache update module to: acquiring a preset number of image files from storage equipment, and storing the image files in a preset cache region, wherein the image files in the cache region are sequenced according to a specified sequence;
an image display module to: reading the image file from the cache region for display;
the cache update module is further configured to: when a user views the displayed image files in the same order or the reverse order of the appointed order, if the image files to be viewed are not judged in the cache region in advance, acquiring the next batch of image files with a preset number from the storage device so as to update the cache region;
the cache updating module acquires the next batch of preset number of image files from the storage device and comprises:
reading a first preset number of image files which are cached in the cache region and a second preset number of image files which are not cached in the cache region from the storage device according to the preset number, wherein if the total number of the image files which are not cached in the cache region by the storage device is less than the second preset number, reading all the image files which are not cached in the cache region from the storage device, and reading the residual number of the image files from the cached image files.
6. The apparatus according to claim 5, wherein the determining that the image file to be viewed is not in the buffer by the cache update module comprises:
viewing the image files in the reverse order of the specified order, if the first marked image file in the cache region is displayed; or, the image files are viewed according to the same sequence of the specified sequence, if the second marked image file is displayed in the cache region, the image file to be viewed is determined not to be in the cache region, and the first marked image file or the second marked image file is the last image file displayed.
7. The apparatus of claim 6, wherein the process of the cache update module reading a first predetermined number of image files that have been cached in the cache area from a storage device comprises:
reading a first predetermined number of image files including the second marked image file when the image files are viewed in the same order of the designated order; or
When the image files are viewed in the reverse order of the designated order, a first predetermined number of image files including the first tagged image file are read.
8. The apparatus of any one of claims 5 to 7, wherein the image display module is configured to:
reading the selected image file from the cache region, and decoding to obtain a thermal imaging image in a JPEG format;
converting the thermal imaging image in JPEG format into a thermal imaging image in YUV420 format;
converting the thermal imaging image in YUV420 format into a thermal imaging image in RGB888 format;
the thermographic image in RGB888 format is converted to a thermographic image in RGB1555 format and the thermographic image in RGB1555 format is displayed.
9. A thermal imaging apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the method of any one of claims 1 to 4.
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| CN106095366A (en) * | 2016-06-07 | 2016-11-09 | 北京小鸟看看科技有限公司 | A kind of shorten the method for picture delay, device and virtual reality device |
| CN108959345A (en) * | 2018-04-11 | 2018-12-07 | 北京航星机器制造有限公司 | A kind of method and apparatus that safety check image recording is quickly recalled |
| CN109299041A (en) * | 2018-07-06 | 2019-02-01 | 平安科技（深圳）有限公司 | A kind of image cache method for cleaning and terminal device |
| CN109005447A (en) * | 2018-08-10 | 2018-12-14 | 高新兴科技集团股份有限公司 | A kind of video recording of security protection high definition falls broadcasting method and device |
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