TWI751447B - Image capturing device and method of lossless data compression and method of lossless data decompression in image streaming - Google Patents

Abstract

An image-capturing device is provided. The image-capturing device includes: an image sensor, a thermal image sensor, and computation unit. The image sensor is configured to capture a first image of a scene. The thermal image sensor is configured to capture a thermal image of the scene in synchronization with the image sensor. The computation unit is configured to receive the first image from the image sensor and the thermal image from the thermal image sensor. The computation unit performs a lossless data compression process on the first image and thermal image to hide the thermal image into least-significant bits of a portion of pixels in the first image.

Description

Image capture device, lossless data compression method for video streaming, and lossless data decompression method

The present invention relates to data transmission, particularly to an image capture device, and a lossless data compression method and a lossless data decompression method for video streaming.

With the development of technology, the use of electronic devices for video streaming has become more and more common. However, traditionally, when implementing an image streaming method, there is a need to hide data or hide an image for transmission after each frame of image. However, most of the current implementation methods are destructive or lossy. way to hide information. That is, if an image with hidden data is played, since the original image data has been destroyed and cannot be restored to the original image, the user is likely to perceive image defects when viewing such an image.

Therefore, there is a need for an image capture device, a lossless data compression method for image streaming, and a lossless data decompression method to solve the above problems.

The present invention provides an image capture device, comprising: an image sensor for capturing a first image of a scene; a thermal image sensor for capturing a thermal image of the scene at the same time; and an operation unit for receiving the first image from the image sensor and the thermal image from the thermal image sensor, wherein the operation unit performs a lossless data compression process on the first image and the thermal image A second image is generated by hiding the thermal image in the lowest bit of some pixels in the first image.

The present invention further provides a lossless data compression method for image streaming, which is used in an image capture device, and the image capture device includes an image sensor and a thermal image sensor, which are used to simultaneously monitor a scene respectively. A first image and a thermal image are captured. The method includes the steps of: receiving the first image from the image sensor and receiving the thermal image from the thermal image sensor; and performing a lossless data compression process on the first image and the thermal image to compress the thermal image The image is hidden in the lowest bit of some pixels in the first image to generate a second image.

The present invention further provides a lossless data decompression method for image streaming for an electronic device, wherein the electronic device is electrically connected to an image capture device, and the image capture device includes an image sensor and a thermal image sensor to simultaneously capture a first image and a thermal image of a scene, the method includes: using the electronic device to receive a second image from the image capture device, wherein the second image is a pair of The first image and the thermal image are obtained by performing a lossless data compression process to hide the thermal image in the lowest bit of some pixels in the first image; using the electronic device from the first pixel plane of the second image , the second pixel plane and the third pixel plane take out the lowest bits of each pixel, and arrange the taken out lowest bits into a first array; use the electronic device to perform a lossless data decompression process on the first array to generate a second array, and divide the second array into a third array and a fourth array; use the electronic device to sequentially replace the bits in the fourth array with the first array in the second image The least significant bits of each pixel of a pixel plane, the second pixel plane and the third pixel plane to generate a third image, and restore the fourth array to the thermal image; and use the electronic device to combine the first The three images and the thermal image are used to generate an output image, and the output image is played on a display screen of the electronic device.

The following descriptions are preferred implementations for completing the invention, and are intended to describe the basic spirit of the invention, but are not intended to limit the invention. Reference must be made to the scope of the following claims for the actual inventive content.

It must be understood that words such as "comprising" and "including" used in this specification are used to indicate the existence of specific technical features, values, method steps, operation processes, elements and/or components, but do not exclude the possibility of Plus more technical features, values, method steps, job processes, elements, components, or any combination of the above.

The use of words such as "first", "second", "third", etc. in the claims is used to modify the elements in the claims, and is not used to indicate that there is a priority order, an antecedent relationship between them, or an element Prior to another element, or chronological order in which method steps are performed, is only used to distinguish elements with the same name.

FIG. 1 is a block diagram of an image capturing apparatus according to an embodiment of the present invention. The image capturing device 100 can be, for example, an external camera, which can be electrically connected to a portable electronic device (such as a smart phone or a tablet computer) or a personal computer, and the captured image data can be sent to the portable electronic device or personal computer. For example, as shown in FIG. 1 , the image capture device 100 includes an image sensor 110 , a thermal image sensor 120 , an operation unit 130 , and a transmission interface 140 . The image sensor 110 may be, for example, a color image sensor, which may be a complementary metal-oxide semiconductor (CMOS) sensor or a charge-coupled device (CCD) sensor. implemented, but the present invention is not limited thereto. The thermal image sensor 120 can be implemented by, for example, an active or passive infrared sensor, or can be implemented by other types of thermal image sensors. In some embodiments, the image sensor 110 and the thermal image sensor 120 have the same field of view (FOV), but the image resolution of the image sensor 110 is much larger than that of the thermal image sensor 120 the resolution.

For example, the resolution of the color image captured by the image sensor 110 may be at least 640×480 or above. Thermal images are usually used to represent the thermal radiation level of objects and their outlines in the image, so high image resolution is not required. The resolution of the thermal image captured by the thermal image sensor 120 may be, for example, 32×32 or 64×64, etc., but the present invention is not limited thereto. In some embodiments, the image format output from the image sensor 110 to the operation unit 130 may be, for example, RGB888 or YUYV format, wherein R, G, B or Y, U, V sub-pixels in each pixel For example, it can be represented by an 8-bit value. The thermal image captured by the thermal image sensor 120 can be represented, for example, by a grayscale image, and each pixel in the thermal image can be represented by, for example, a 13-bit value (for example, a signed number or an unsigned number).

The operation unit 130 can be, for example, a processor, a microprocessor, a digital signal processor (DSP), or an image signal processor (ISP), but the present invention does not limited to this. The transmission interface 140 can be, for example, a Universal Serial Bus (USB) interface, for example, can support USB 1.2 or above standards. In addition, the transmission interface 140 can include a USB connector 141, such as a Micro USB connector or a USB-C connector, wherein the transmission interface 140 can communicate with the portable electronic device through the above-mentioned USB connector or through a USB data cable connected to the USB connector. device or PC to connect. Therefore, the computing unit 130 can perform data transmission or image streaming with the portable electronic device or the personal computer connected to the image capturing device 100 through the USB protocol.

The computing unit 130 is used to receive the color image from the image sensor 110 and the thermal image from the thermal image sensor 120 , and hide the received thermal image to color in a lossless compression manner. In the image data, the integrated color image is transmitted to a portable electronic device or a personal computer through the transmission interface 140 for subsequent processing. For example, the computing unit 130 can read a code of an image data compression program from a non-volatile memory (eg, a ROM) in the image capture device 100 and execute it to hide the thermal image in the color image.

Specifically, if the color image from the image sensor 110 is presented in a YUYV array, it means that the color image is in the YUV422 8-bit format. If the resolution of the color image is 640×480, the resolution of the Y pixel plane is also 640×480, and the resolution of the U pixel plane and the V pixel plane is 320×480. Therefore, the total amount of data in the above color image is 640x480*2=614400 bytes. If the resolution of the thermal image from the thermal image sensor 120 is 32×32, and each pixel is a value of 13 bits, the total data amount of the thermal image is 32×32×13=13312 bits.

In one embodiment, the computing unit 130 receives the first image captured by the image sensor 110, and respectively converts the first Y pixel plane, the first U pixel plane and the first V pixel originally in the first image into the first image. The least-significant bit (LSB) of each Y, U, V pixel value in the plane is extracted, and the extracted LSBs are arranged in the order of raster scan into the first one-dimensional array, so The length of the above one-dimensional array is 614400 bits. If the data of each pixel of the thermal image is arranged in a sequential scanning sequence into a second one-dimensional array, and appended to the back, front, or designated position of the first array, a third one-dimensional array is generated. Therefore, the total data amount of the third one-dimensional array is 614400+13312=627712 bits.

Next, the operation unit 130 uses a lossless data compression algorithm to perform data compression on the third one-dimensional array, and the target data amount of the fourth one-dimensional array obtained after compression is 614,400 bits. Since the target data volume of the compressed fourth one-dimensional array is about 97.8% of the total data volume of the third one-dimensional array, the data compression rate is about 2.2%. The above-mentioned lossless data compression algorithm can be, for example, a conventional algorithm in the technical field of the present invention, such as gzip, bzip2, lzma, lzma-e, xz, xz-e, lz4, lzop, etc., but the present invention is not limited to this . The ratio (%) of the lossless data compression of the conventional algorithms listed above under different data compression conditions is shown in Table 1: Compression conditions gzip bzip2 lzma lzma -e xz xz-e lz4 lzop 1 26.8 20.2 18.4 15.5 18.4 15.5 35.6 36.0 2 25.5 18.8 17.5 15.1 17.5 15.1 35.6 35.8 3 24.7 18.2 17.1 14.8 17.1 14.8 35.6 35.8 5 22.0 17.6 14.9 14.6 14.9 14.6 - 35.8 7 21.5 17.2 14.4 14.3 14.4 14.3 - 24.9 9 21.4 16.9 14.1 14.0 14.1 14.0 - 24.6 Table 1

After the fourth one-dimensional array is obtained, the operation unit 130 sequentially fills (or replaces) the fourth one-dimensional array with the lowest level of each pixel in the first Y pixel plane, the first U pixel plane and the first V pixel plane. bits to obtain a second Y pixel plane, a second U pixel plane, and a second V pixel plane, and the second Y pixel plane, the second U pixel plane, and the second V pixel plane form a second image. In other words, some of the pixels in the second Y pixel plane, the second U pixel plane and the second V pixel plane corresponding to the first Y pixel plane, the first U pixel plane and the first V pixel plane may have some slightly different. Compared with the first image originally captured by the image capture device 100, the second image contains some pixels whose lowest bit has been modified, so it will not have a great impact on the image quality. The device directly plays the second image, and the user usually cannot detect any image defects.

After obtaining the second image, the computing unit 130 can transmit the second image in the form of video stream to the electronic device connected to the image capture device 100 in the form of video stream through the transmission interface 140 to the electronic device connected to the image capture device 100 for subsequent processing Process, for example, a portable electronic device or a personal computer.

FIG. 2A is a schematic diagram of a connection state of an image capturing device and an electronic device according to an embodiment of the present invention. FIG. 2B is a block diagram of an electronic device according to an embodiment of the present invention. Please refer to both Figure 2A and Figure 2B.

As shown in FIG. 2A , the electronic system 10 includes an image capture device 100 and an electronic device 200 , and the image capture device 100 can communicate with the electronic device through a USB connector of the transmission interface (or through a USB data cable connected to the USB connector). 200 is connected, wherein the electronic device 200 is, for example, a portable electronic device or a personal computer. Therefore, the computing unit 130 can perform data transmission or image streaming with the portable electronic device or the personal computer connected to the image capturing device 100 through the USB protocol.

As shown in FIG. 2B , the electronic device 200 includes a processor 210 , a memory unit 220 , a storage device 230 , a transmission interface 240 , and a display screen 250 . The processor 210 may be, for example, a central processing unit (CPU) or a general-purpose processor, but the invention is not limited thereto. The memory unit 220 is, for example, a volatile memory, such as dynamic random access memory (DRAM) or static random access memory (SRAM), but the present invention is not limited to this.

The storage device 230 may be a non-volatile memory, such as a hard disk drive (hard disk drive), a solid-state disk (SSD), a flash memory (flash memory), a read-only memory (read only memory) -only memory, ROM), etc., but the present invention is not limited thereto. The storage device 230 stores an image data compressing program 231 and an operating system 232, wherein the image data compressing program 231 can perform corresponding lossless processing on the color image received by the electronic device 200 from the image capturing device 100 that includes the hidden thermal image. The data decompression process is used to obtain the original color image and thermal image of the image capture device 100 respectively, and the color image, the thermal image, or the output image obtained by combining the color image and the thermal image can be displayed on the display screen 250 . The operating system 232 may be, for example, an Android operating system, an iOS operating system, a Linux system, or a Windows operating system, etc., but the present invention is not limited thereto. The processor 210 reads and executes the image data compression program 231 and the operating system 232 from the storage device 230 to the memory unit 220 .

The transmission interface 240 can be, for example, a Universal Serial Bus (USB) interface, for example, can support USB 1.2 or above standards. In addition, the transmission interface 240 can be, for example, a Micro USB female socket or a USB-C female socket, wherein the transmission interface 240 can be connected to the image capture device 100 through the above-mentioned USB socket or through a USB data cable connected to the USB socket. Therefore, the processor 210 can receive an image streaming color image from the image capture device 100 through the USB protocol, wherein the color image already includes the hidden thermal image.

For example, the image data compression program 231 can identify whether the image capture device 100 is the model or product identifier of the corresponding image capture device. If, for example, the image data compression program 231 recognizes that the model or product identifier of the image capture device 100 belongs to a preset model or product identifier, it means that the image capture device 100 can use a predetermined lossless image data compression process to hide the thermal image into the in color image. Therefore, the image data compression program 231 can use a predetermined lossless image data decompression process to extract the thermal image from the above-mentioned color image. Wherein, the flow of the above-mentioned lossless image data decompression processing is opposite to the above-mentioned flow of the lossless image data compression processing.

If the image capture device 100 and the electronic device 200 are not matched with each other, for example, one of the image capture device 100 and the electronic device 200 does not execute a lossless image data compression program, the processor 210 of the electronic device 200 cannot detect the data from the image The color images received by the capture device 100 are hidden thermal images, and only the received color images are considered to be normal color images and the color images are normally played on the display screen.

For example, if the color image captured by the image capturing device 100 is the first image, and the thermal image is subjected to lossless image data compression processing to be hidden in the first image, the second image will be obtained. In the lossless image data decompression process, the processor 210 firstly decompresses the received second image from the first pixel plane (eg, the Y pixel plane), the second pixel plane (eg, the U pixel plane), and the third pixel Each pixel in the plane (for example, the V pixel plane) extracts its lowest bit, and forms each lowest bit to form a one-dimensional array, wherein the one-dimensional array is obtained in the process of lossless image data compression processing. The third one-dimensional array, and the amount of data is 614400 bits. Therefore, the processor 210 performs lossless data decompression processing on the third one-dimensional array to obtain an uncompressed one-dimensional array, such as a fourth one-dimensional array, including the original first one-dimensional array of the least significant bit plus the thermal The pixel data array of the image, and the total data amount of the fourth one-dimensional array is 614400+13312=627712 bits.

Therefore, the processor 210 can divide the fourth array into a fifth array and a sixth array, wherein the fifth array is, for example, the least significant bit array extracted from each pixel of each pixel plane in the first image, and the sixth array is, for example, Thermal imaging pixel array. For example, the processor 210 extracts the 13312-bit segment of the thermal image in the fourth one-dimensional array to obtain the sixth array, which can be, for example, in the front, back, or middle of the fourth one-dimensional array. Depends on the method used for the lossless data decompression process.

Next, the processor 210 sequentially replaces the values in the fifth array with the least significant bits of each pixel of the first pixel plane, the second pixel plane, and the third pixel plane in the second image to generate a third image , and restore the sixth array to a thermal image. The third image is the same as the first image, which means that after the first image is added to the thermal image through lossless data compression processing, the obtained second image is then subjected to lossless data decompression processing to obtain the original first image and the thermal image. Thermal image.

FIG. 3A is a schematic diagram of a color image according to an embodiment of the present invention. FIG. 3B is a schematic diagram of a thermal image according to an embodiment of the present invention. FIG. 3C is a schematic diagram of a thermal image superimposed on a color image according to an embodiment of the present invention.

Please also refer to Figures 2A-2B and Figures 3A-3C. In one embodiment, the image capture device 100 can, for example, take a picture of a tea cup placed on a table and filled with hot water. After the electronic device 200 goes through the lossless data decompression process of the embodiment in FIGS. 2A-2B, a third image and a thermal image can be obtained, wherein the third image is the color image originally captured by the image capturing device 100, such as shown in Figure 3A. In addition, the above thermal image is the thermal image captured by the image capturing device 100 originally, as shown in FIG. 3B . In the thermal image of Figure 3B, the red pixels represent the higher temperature parts, the yellow pixels represent the moderate temperature parts, and the green pixels represent the lower temperature parts.

In some embodiments, the electronic device 200 may select whether to combine the third image in FIG. 3A and the thermal image in FIG. 3B to generate an output image, as shown in FIG. 3C , according to the user's needs. For example, in Figures 3A to 3C, the lower left button is used to turn on/off the function of displaying the third image, and the lower right button is used to turn on/off the function of displaying the thermal image. In FIG. 3A , the lower left button is turned on and the lower right button is turned off, so the electronic device 200 plays the third image on the display screen 250 . In FIG. 3B , the lower left button is turned off and the lower right button is turned on, so the electronic device 200 plays the thermal image on the display screen 250 . In FIG. 3C , the lower left button and the lower right button are both turned on, so the electronic device 200 plays the output image on the display screen 250 .

FIG. 4A is a flowchart of a lossless image data compression method according to an embodiment of the present invention. Please also refer to Figures 2A-2B and Figure 4A.

In step S410, the image capture device 100 starts the image data compression program. Wherein, the operation unit 130 of the image capture device 100 can read and execute the image data compression program stored in a non-volatile memory, for example.

In step S412 , the computing unit 130 receives the first image from the image sensor 110 and the thermal image from the thermal image sensor 120 . The first image may be, for example, in the format of YUV422, and the thermal image may be represented by, for example, a grayscale image.

In step S414, the operation unit 130 extracts the least significant bit of each pixel from the first pixel plane, the second pixel plane, and the third pixel plane in the first image. The first pixel plane, the second pixel plane, and the third pixel plane in the first image are, for example, a Y pixel plane, a U pixel plane, and a V pixel plane, respectively.

In step S416, the operation unit 130 arranges the extracted least significant bits into a first array. Wherein, the above-mentioned first array is, for example, a one-dimensional array.

In step S418, the computing unit 130 adds each pixel data of the thermal image to the first array to generate the second array. Wherein, the position where each pixel data of the thermal image is attached to the first array may be a front section, a rear section, or a designated position in the middle of the first array.

In step S420, the operation unit 130 performs lossless data compression on the second array to generate a third array. For example, in the embodiment of FIG. 1, the total data amount of the first array is, for example, 614,400 bits, and the total data amount of the second array is, for example, 627,712 bits. In addition, the total data volume of the third array generated by the lossless data compression process is the same as the total data volume of the first array, and the above lossless data compression process can use, for example, a conventional lossless data compression algorithm in the field of the present invention .

In step S422, the operation unit 130 sequentially replaces the pixels in the third array with the least significant bits of the pixels in the first pixel plane, the second pixel plane, and the third pixel plane in the first image to generate a second image . For example, the third array is the original array generated by the lossless compression of the first array and the thermal image pixel array, and the total data amount of the third array is the same as that of the first array, so the operation unit 130 can The bits in the first image sequentially replace the least significant bits of the pixels in the first pixel plane, the second pixel plane, and the third pixel plane in the first image.

In step S424 , the computing unit 130 transmits the second image to the electronic device 200 . For example, the computing unit 130 can transmit the second image to the electronic device 200 through the transmission interface 140 in an image streaming manner of the USB protocol.

FIG. 4B is a flowchart of a method for decompressing lossless image data according to an embodiment of the present invention. Please also refer to Figures 2A-2B and Figure 4B. The flow of the lossless image data decompression method in FIG. 4B is opposite to the flow of the lossless image data compression method in FIG. 4A.

In step S440, the electronic device 200 starts the image data compression program 231.

In step S442 , the electronic device 200 receives the second image from the image capturing device 100 . The electronic device 200 and the image capture device 100 need to be matched with each other, and both execute corresponding image data compression programs, so as to perform the data compression and data decompression processes shown in FIGS. 4A to 4B . If the electronic device 200 and the image capturing device 100 are not matched with each other, the electronic device 200 can only perform the general image streaming function, and cannot obtain the thermal image hidden in the second image.

In step S444, the electronic device 200 extracts the least significant bit of each pixel from the first pixel plane, the second pixel plane, and the third pixel plane in the second image.

In step S446, the electronic device 200 arranges the extracted least significant bits into a third array. The third array here is the same as the third array described in Figure 4A, which means that the second array (including the lowest bit array and the thermal image pixel array) is an array obtained after lossless data compression .

In step S448, the electronic device 200 performs a lossless data decompression process on the third array to generate a fourth array.

In step S450, the electronic device 200 divides the fourth array into a fifth array and a sixth array. Wherein, the fifth array is, for example, the lowest bit array extracted from each pixel of each pixel plane in the first image, and the sixth array is, for example, a thermal image pixel array.

In step S452, the electronic device 200 sequentially replaces the lowest bits of each pixel in the first pixel plane, the second pixel plane, and the third pixel plane in the second image with the bits in the fifth array to generate a third image , and restore the sixth array to a thermal image. The third image is the same as the first image.

In step S454, the electronic device 200 combines the third image and the thermal image to generate an output image. Wherein, the above operation of combining the third image and the thermal image, for example, may depend on the needs of the user. For example, the buttons at the lower left and the lower right in Figures 3A to 3C can respectively control the opening and closing of the third image and the thermal image. , when the lower left and lower right buttons are both turned on, the electronic device 200 combines the third image and the thermal image to generate an output image.

In step S456 , the electronic device 200 plays the output image on the display screen 250 . Therefore, the user can view the image of the object in the output image and the temperature distribution of the object on the display screen.

It should be noted that, in the embodiments of Figures 1 to 4 of this case, the words "first", "second", "third" added before the nouns of images or arrays are used to distinguish different images. images or arrays are not used to qualify the names of different images or arrays.

In summary, the present invention provides an image capture device, and a lossless data compression method and a lossless data decompression method for video streaming, which can utilize the lossless data compression method to compress the thermal data captured by the image capture device. The image is hidden in the lowest bit of some pixels in the captured color image, in addition to hiding the information of the thermal image from being detected by outsiders, it also does not damage the image quality of the original color image. Even if the color image with the thermal image hidden in it is received by an electronic device not corresponding to the image capture device, the electronic device cannot find the information hidden in the color image, and the color image can be played normally. Therefore, the present invention can utilize the lossless data compression method and the lossless data decompression method for image streaming to achieve the purpose of protecting thermal image information.

Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the scope of the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the appended patent application.

10: Electronic Systems 100: Image capture device 110: Image sensor 120: Thermal image sensor 130: Operation unit 140: Transmission interface 141:USB connector 200: Electronics 210: Processor 220: memory unit 230: Storage Device 231: Image Data Compressor 232: Operating System 240: Transmission interface 250: Display screen S410～S424, S440～S456: steps

FIG. 1 is a block diagram of an image capturing apparatus according to an embodiment of the present invention. FIG. 2A is a schematic diagram of a connection state of an image capturing device and an electronic device according to an embodiment of the present invention. FIG. 2B is a block diagram of an electronic device according to an embodiment of the present invention. FIG. 3A is a schematic diagram of a color image according to an embodiment of the present invention. FIG. 3B is a schematic diagram of a thermal image according to an embodiment of the present invention. FIG. 3C is a schematic diagram of a thermal image superimposed on a color image according to an embodiment of the present invention. FIG. 4A is a flowchart of a lossless image data compression method according to an embodiment of the present invention. FIG. 4B is a flowchart of a method for decompressing lossless image data according to an embodiment of the present invention.

100: Image capture device

110: Image sensor

120: Thermal image sensor

130: Operation unit

140: Transmission interface

141:USB connector

Claims (8)

An image capture device, comprising: an image sensor for capturing a first image of a scene; a thermal image sensor for capturing a thermal image of the scene at the same time; and an arithmetic unit, for receiving the first image from the image sensor and receiving the thermal image from the thermal image sensor; wherein the computing unit performs a lossless data compression process on the first image and the thermal image to compress the thermal image The image is hidden in the lowest bit of some pixels in the first image to generate a second image; wherein the operation unit extracts each pixel of the first pixel plane, the second pixel plane, and the third pixel plane in the first image The lowest bits of the thermal image are arranged into a first array, and each pixel data of the thermal image is added to the first array to generate a second array. The image capture device as described in claim 1, wherein the computing unit performs the lossless data compression process on the second array to generate a third array, wherein the total data volume of the third array is equal to the first array The total amount of data in an array. The image capture device as described in claim 2, wherein the operation unit sequentially replaces the first pixel plane and the second pixel plane in the first image with each pixel in the third array and the lowest bit of each pixel of the third pixel plane to generate the second image. The image capture device as described in claim 1, wherein the computing unit further transmits the second image to an electronic device electrically connected to the image capture device, and the electronic device is connected to the second image Image execution corresponds to the lossless data compression A lossless data decompression process is processed to obtain a third image and the thermal image, respectively, wherein the third image is the same as the first image. A lossless data compression method for image streaming, used in an image capture device, the image capture device includes an image sensor and a thermal image sensor for simultaneously capturing a first scene for a scene respectively. An image and a thermal image, the method comprising: receiving the first image from the image sensor and receiving the thermal image from the thermal image sensor; and performing a lossless data compression on the first image and the thermal image Processing to hide the thermal image in the lowest bit of some pixels in the first image to generate a second image, wherein the method further includes: extracting the first pixel plane, the second pixel plane, the The least significant bits of each pixel of the three-pixel plane; the extracted least significant bits are arranged into a first array; and each pixel data of the thermal image is added to the first array to generate a second array. The lossless data compression method for video streaming as described in item 5 of the scope of application, further comprising: performing the lossless data compression process on the second array to generate a third array, wherein the total data of the third array The amount is equal to the total data amount of the first array. The lossless data compression method for image streaming as described in item 6 of the claimed scope, further comprising: sequentially replacing the pixels in the third array with the first pixel plane in the first image, the The lowest bits of each pixel of the second pixel plane and the third pixel plane are used to generate the second image. A lossless data decompression method for image streaming for an electronic device, wherein the electronic device is electrically connected to an image capture device, and the image The capture device includes an image sensor and a thermal image sensor to capture a first image and a thermal image of a scene respectively, and the method includes: using the electronic device to receive a second image from the image capture device image, wherein the second image is obtained by performing a lossless data compression process on the first image and the thermal image to hide the thermal image in the lowest bit of some pixels in the first image; The first pixel plane, the second pixel plane, and the third pixel plane of the second image extract the lowest bits of each pixel, and arrange the extracted lowest bits into a first array; An array performs a lossless data decompression process to generate a second array, and the second array is divided into a third array and a fourth array; the bits in the fourth array are sequentially replaced by the electronic device The least significant bits of each pixel of the first pixel plane, the second pixel plane, and the third pixel plane in the second image to generate a third image, and restore the fourth array to the thermal image ; and use the electronic device to combine the third image and the thermal image to generate an output image, and play the output image on a display screen of the electronic device.

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