Photograph Image Memory Method and Stroboscope

Abstract

To facilitate observation of a subject in observing the subject in a photographic image including a person.SOLUTION: A control apparatus acquires a photographic image. The control apparatus acquires an imaging condition that was used at the time of acquiring the photographic image. The control apparatus superimposes a first code indicating the imaging condition on the photographic image, the first code being obtained by modifying U component by first modification amount, out of three Y, U, V components representing the photographic image. The control apparatus superimposes a second code indicating the imaging condition on the photographic image, the second code being obtained by modifying U component by second modification amount, out of three Y, U, V components representing the photographic image. The control apparatus switches operation between superimposing the first code on the photographic image and superimposing the second code on the photographic image, per image. The control apparatus stores the photographic image in a storage medium.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a method for storing a photographed image and a strobe.

Background Art

[0002] As a method for storing a photographed image taken by a camera in a storage medium, for example, it is disclosed in Patent Document 1. The method for storing a photographed image disclosed in Patent Document 1 stores a photographed image with a two-dimensional code superimposed thereon. The two-dimensional code indicates shooting conditions. By superimposing the shooting conditions as a two-dimensional code on the photographed image, the photographed image and the shooting conditions can be associated with each other. Thereby, it is possible to suppress the complication of the folder as compared with the case where data indicating the shooting conditions is created for each photographed image and stored in a folder together with the photographed image.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a two-dimensional code is superimposed on a photographed image, a part of the photographed image is hidden by the two-dimensional code. This makes it difficult to observe the subject when a person observes the subject captured in the photographed image.

Means for Solving the Problems

[0005] The method for storing captured images for solving the above problems is a method for storing captured images acquired from a camera by a control device in a storage medium, wherein the control device acquires the captured images, acquires shooting conditions at the time when the captured images are acquired, and a first code in which at least one of the U component and the V component among the three components of YUV representing the captured images is changed by a first change amount and which indicates the shooting conditions is superimposed on the captured images, and a second code in which the same component as the component changed by the first change amount among the U component and the V component is changed by a second change amount and which indicates the shooting conditions is superimposed on the captured images, and stores the captured images in the storage medium. Superimposing the first code on the captured images and superimposing the second code on the captured images are performed on a plurality of the captured images continuously acquired from the camera, and superimposing the first code on the captured images and superimposing the second code on the captured images are switched every predetermined number of sheets.

[0006] When a plurality of captured images stored in the storage medium are continuously displayed, the captured image with the first code superimposed thereon and the captured image with the second code superimposed thereon are switched. At this time, the human visual sense is sensitive to the difference in the brightness component but is less responsive to the difference in color. When the captured image with the first code superimposed thereon and the captured image with the second code superimposed thereon are displayed while being switched, a person will perceive the color in which the first code and the second code are mixed. As a result, when the captured image with the first code superimposed thereon and the captured image with the second code superimposed thereon are continuously displayed, the first code and the second code are difficult to be visually recognized. It is possible to suppress the difficulty of visually recognizing the shooting object captured in the captured image due to the first code and the second code. Therefore, when a person observes the shooting object captured in the captured image, it is easy to observe the shooting object.

[0007] Regarding the above-described photographed image storage method, when the control device superimposes the first code on the photographed image, the control device superimposes the first code obtained by adding the first change amount to at least one of the U component and the V component on the photographed image, and when the control device superimposes the second code on the photographed image, the control device superimposes the second code obtained by subtracting the second change amount from the same component as the component changed by the first change amount among the U component and the V component on the photographed image.

[0008] Regarding the above-described photographed image storage method, when the control device superimposes the first code on the photographed image, the control device may superimpose the first code obtained by changing one of the U component and the V component by the first change amount on the photographed image.

[0009] The strobe scope for solving the above problems includes a camera and a control device, and is a strobe scope that stores a photographed image acquired from the camera in a storage medium. The control device acquires the photographed image, acquires shooting conditions at the time when the photographed image is acquired, superimposes a first code, which is a first code obtained by changing at least one of a U component and a V component among three components of YUV representing the photographed image by a first change amount and indicating the shooting conditions, on the photographed image, superimposes a second code, which is a second code obtained by changing the same component as the component changed by the first change amount among the U component and the V component by a second change amount and indicating the shooting conditions, on the photographed image, stores the photographed image in the storage medium, and the superimposition of the first code on the photographed image and the superimposition of the second code on the photographed image are performed on a plurality of the photographed images continuously acquired from the camera, and the superimposition of the first code on the photographed image and the superimposition of the second code on the photographed image are switched every predetermined number of sheets.

[0010] When the photographed image with the first code superimposed and the photographed image with the second code superimposed are continuously displayed, the first code and the second code are difficult to be visually recognized. It is possible to suppress the difficulty of visually recognizing the photographed object shown in the photographed image due to the first code and the second code. Therefore, when a person observes the photographed object shown in the photographed image, it is easy to observe the photographed object.

Advantages of the Invention

[0011] When a person observes a subject shown in a captured image, it becomes easier to observe the subject.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0013] A method for storing a captured image and an embodiment of a stroboscope will be described. The method for storing a captured image and the stroboscope in this embodiment are used for observing a loom. First, the loom will be described.

[0014] <Loom> As shown in FIG. 1, the loom 10 includes a main shaft 11, a detection unit 12, and an output unit 13. The loom 10 is an air-jet loom that inserts the weft by air. The main shaft 11 is driven by a motor (not shown). The loom 10 includes a nozzle (not shown) that ejects the weft. The timing at which the nozzle ejects the weft corresponds to the rotation angle of the main shaft 11. The nozzle ejects the weft when the rotation angle of the main shaft 11 rotates by a predetermined angle from a specific angle. In the following description, a specific rotation angle of the main shaft 11 is referred to as a reference angle. Also, the delay angle with respect to the reference angle is referred to as a delay angle.

[0015] The detection unit 12 detects the rotation angle of the main shaft 11. The detection unit 12 is, for example, a rotary encoder. The detection unit 12 is connected to the output unit 13. The detection unit 12 transmits the detection result to the output unit 13. The output unit 13 outputs a signal to the stroboscope every time the rotation angle of the main shaft 11 detected by the detection unit 12 reaches a preset reference angle. For example, when the reference angle is 0 [°], the output unit 13 outputs a signal every time the rotation angle of the main shaft 11 reaches 0 [°].

[0016] <Stroboscope> The stroboscope 20 includes a light emitter 21, a camera 22, a display unit 23, an input unit 24, and a control device 25.

[0017] The light emitter 21 is, for example, a light-emitting diode. The light emitter 21 is controlled by the control device 25. The camera 22 is an imaging device. The camera 22 includes an imaging element. The camera 22 is provided so as to be able to photograph the portion illuminated by the light emitter 21. The camera 22 is controlled by the control device 25.

[0018] The stroboscope 20 is arranged with respect to the loom 10 such that the light emitter 21 illuminates the weft yarn and the camera 22 photographs the weft yarn. The imaging target of the camera 22 is the loom 10. The stroboscope 20 may be fixed at a desired position by a fixing device (not shown).

[0019] The display unit 23 is, for example, a display such as a liquid crystal display or an organic electroluminescence display. Various data can be displayed on the display unit 23. The display unit 23 is controlled by the control device 25.

[0020] The input unit 24 is a member for a user of the stroboscope 20 to perform an input operation on the stroboscope 20. Examples of the input unit 24 include a dial, a physical button, and a touch panel. The gain setting and the shooting phase of the camera 22 can be set by the input unit 24. The shooting phase defines the timing at which the loom 10 is photographed by the camera 22. The shooting phase is defined by a delay angle with respect to a reference angle.

[0021] The control device 25 includes a processor 26 and a storage unit 27. Examples of the processor 26 include a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), and a DSP (Digital Signal Processor). The storage unit 27 includes a RAM (Random Access Memory) and a ROM (Read Only Memory). The storage unit 27 stores program codes or instructions configured to cause the processor 26 to execute processing. The storage unit 27, that is, the computer-readable medium, includes any available medium accessible by a general-purpose or dedicated computer. The control device 25 may be configured by a hardware circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The control device 25, which is a processing circuit, may include one or more processors operating according to a computer program, one or more hardware circuits such as an ASIC or an FPGA, or a combination thereof.

[0022] The control device 25 can store the captured images taken by the camera 22 in the storage medium 30. The storage medium 30 may be built into the strobe 20. The storage medium 30 may be an external storage medium connectable to the strobe 20. The storage medium 30 may be provided by a server connected to the control device 25 via a network. That is, it is sufficient that the control device 25 can write data to the storage medium 30. As the storage medium 30, a storage medium capable of rewriting data is used. Examples of the storage medium 30 include a hard disk drive, a solid state drive, an EEPROM (Electrically Erasable Programmable Read Only Memory), and a flash memory.

[0023] <Method for Storing Captured Images> The strobe 20 is used to capture the posture of the weft yarn and the like by the camera 22 when adjusting the operating conditions of the loom 10. When adjusting the operating conditions of the loom 10, a plurality of captured images continuously captured by the camera 22 are obtained. A plurality of captured images continuously captured by the camera 22 when adjusting the operating conditions of the loom 10 are defined as an image group. When adjusting the operating conditions of the loom 10, the image group is stored in the storage medium 30 by the following method for storing captured images.

[0024] The image storage control performed by the control device 25 will be described. The image storage control is repeatedly performed when adjusting the operating conditions of the loom 10. As shown in FIG. 2, in step S1, the control device 25 acquires a captured image. The captured image is a captured image represented by three components of YUV. Among YUV, the Y component means a luminance component. Among YUV, the U component and the V component mean color difference components. The U component is the difference between the luminance signal and the blue component. The V component is the difference between the luminance signal and the red component. As long as it is a camera 22 that can obtain a captured image in YUV format, the control device 25 may acquire a captured image in YUV format from the camera 22. The control device 25 may also acquire a captured image in YUV format by converting the captured image acquired from the camera 22. For example, when the captured image acquired from the camera 22 is in RGB format, the control device 25 may acquire a captured image in YUV format by converting the RGB format to the YUV format.

[0025] Next, in step S2, the control device 25 acquires shooting conditions. The shooting conditions include at least the shooting time and the operation conditions. The shooting time is the time when the captured image in step S1 is acquired. The shooting time can be acquired by a timing function provided in the control device 25. The shooting time may also be acquired from a real-time clock. The operation conditions include at least one of the gain setting of the camera 22, the shooting phase, and the weaving conditions. The weaving conditions are, for example, the pressure when the nozzle ejects the weft yarn. The expression "at least one" used in the present embodiment means "one or more" of the desired options. As an example, the expression "at least one" used in this specification means "only one option" or "both of the two options" if the number of options is two. As another example, the expression "at least one" used in this specification means "only one option" or "any combination of two or more options" if the number of options is three or more. The gain setting and the shooting phase of the camera 22 are set by the input unit 24.

[0026] Next, in step S3, the control device 25 determines whether the captured image acquired in step S1 is the captured image acquired in the odd number. Each time the control device 25 acquires a captured image from the camera 22 in step S1, it counts the number of times the captured image has been acquired from the camera 22. Thereby, the control device 25 can determine whether the captured image acquired in step S1 is the captured image acquired in the odd number or the captured image acquired in the even number. The counting of the number of times the captured image has been acquired from the camera 22 is reset when the storage of the image group in the storage medium 30 by the captured image storage method is completed. That is, it can be said that the control device 25 determines whether the captured image is the odd number or the even number in the image group. If the determination result in step S3 is affirmative, the control device 25 performs the process of step S4. If the determination result in step S3 is negative, the control device 25 performs the process of step S5.

[0027] As shown in FIGS. 2 and 3, in step S4, the control device 25 superimposes a first code C1 obtained by changing the U component among the three components of YUV representing the captured image IM by a first change amount on the captured image IM acquired in step S1. Specifically, the control device 25 superimposes the first code C1 obtained by changing the U component of the pixel by the first change amount on the captured image IM for each pixel on which the first code C1 is superimposed. The Y component and the V component among the pixels on which the first code C1 is superimposed are not changed. That is, the first code C1 is generated by changing only the U component among the three components of YUV representing the captured image IM acquired in step S1. The first change amount is a constant value. The first change amount is an integer. In the present embodiment, the control device 25 superimposes the first code C1 obtained by adding the first change amount to the U component among the three components of YUV representing the captured image IM on the captured image IM. The first code C1 indicates the imaging condition acquired in step S2. The first code C1 may be a two-dimensional code such as a QR code (registered trademark) or a one-dimensional code such as a bar code. After finishing the process of step S4, the control device 25 performs the process of step S6.

[0028] As shown in FIGS. 2 and 4, in step S5, the control device 25 superimposes a second code C2 obtained in step S1 on the captured image IM, where the U component among the three YUV components representing the captured image IM is changed by a second change amount. Specifically, the control device 25 superimposes the second code C2, in which the U component of each pixel where the second code C2 is to be superimposed is changed by the second change amount, on the captured image IM. Among the Y component and the V component of the pixels where the second code C2 is to be superimposed, they are not changed. That is, the second code C2 is generated by changing only the U component among the three YUV components representing the captured image IM obtained in step S1. The second change amount is a constant value. The second change amount is the same value as the first change amount. In the present embodiment, the control device 25 superimposes a second code C2 obtained by subtracting the second change amount from the U component among the three YUV components representing the captured image IM on the captured image IM. The second code C2 indicates the imaging conditions obtained in step S2. The second code C2 may be a two-dimensional code such as a QR code or a one-dimensional code such as a barcode. After finishing the process of step S5, the control device 25 performs the process of step S6.

[0029] As described above, the first code C1 is superimposed on the odd-numbered captured images IM. The second code C2 is superimposed on the even-numbered captured images IM. Since the odd and even numbers are switched every one image, superimposing the first code C1 on the captured image IM and superimposing the second code C2 on the captured image IM are switched every one image. The sizes of the first code C1 and the second code C2 are arbitrary, but it is preferable that the size of the first code C1 is the same as the size of the second code C2. The positions where the first code C1 and the second code C2 are superimposed are arbitrary, but it is preferable that the position where the first code C1 is superimposed is the same as the position where the second code C2 is superimposed.

[0030] In step S6, the control device 25 stores the captured image IM in the storage medium 30. If the captured image IM is an odd-numbered one, the captured image IM with the first code C1 superimposed thereon is stored in the storage medium 30. If the captured image IM is an even-numbered one, the captured image IM with the second code C2 superimposed thereon is stored in the storage medium 30. It can be said that the control device 25 alternately stores in the storage medium 30 the captured image IM with the first code C1 superimposed thereon and the captured image IM with the second code C2 superimposed thereon. By repeatedly performing the processes of steps S1 to S6 when adjusting the operating conditions of the loom 10, the captured images IM constituting the image group are stored in the storage medium 30.

[0031] [Operation of the present embodiment] The image group stored in the storage medium 30 can be displayed on the display unit. The display unit is, for example, provided in a computer capable of reading the data stored in the storage medium 30. When displaying the image group on the display unit, it can be reproduced as a moving image by continuously reproducing the image group. The continuous reproduction is performed by switching the captured images IM displayed on the display unit in the order of the shooting times. When continuously reproducing the image group, the captured image IM with the first code C1 superimposed thereon and the captured image IM with the second code C2 superimposed thereon are alternately switched and displayed on the display unit. A person can observe the state of the loom 10 during the adjustment of the operating conditions of the loom 10 by visually recognizing the captured images IM displayed on the display unit. At this time, the human visual sense is sensitive to the difference in the brightness component but is less responsive to the difference in color. When the captured image IM with the first code C1 superimposed thereon and the captured image IM with the second code C2 superimposed thereon are alternately displayed, a person will perceive the color in which the first code C1 and the second code C2 are mixed, and it will seem as if the image before the images at the locations where the first code C1 and the second code C2 are superimposed are superimposed is restored. As a result, when the captured image IM with the first code C1 superimposed thereon and the captured image IM with the second code C2 superimposed thereon are continuously displayed on the display unit, the first code C1 and the second code C2 are difficult to be visually recognized.

[0032] [Effect of the present embodiment] (1) The control device 25 switches, for each image, between superimposing on the captured image IM a first code C1 in which the U component is changed by a first change amount and superimposing on the captured image IM a second code C2 in which the U component is changed by a second change amount. When a plurality of captured images IM stored in the storage medium 30 are continuously displayed, the first code C1 and the second code C2 are difficult to visually recognize. It is possible to suppress the difficulty of visually recognizing the loom 10 shown in the captured image IM due to the first code C1 and the second code C2. Therefore, it is easy for a person to observe when observing the captured image IM. Also, the first code C1 and the second code C2 superimposed on the captured image IM only need to be difficult to visually recognize when a plurality of captured images IM are continuously displayed, and do not need to be difficult to visually recognize even when the captured image IM is viewed alone. Therefore, when the captured image IM is displayed alone instead of being continuously displayed, the first code C1 and the second code C2 can be identified without problems.

[0033] (2) The control device 25 superimposes on the captured image IM a first code C1 obtained by adding a first change amount to the U component of the captured image IM. The control device 25 superimposes on the captured image IM a second code C2 obtained by subtracting a second change amount from the U component of the captured image IM. When using the first code C1 obtained by multiplying the U component by a predetermined value, a decimal point may occur in the U component during the processing of the control device 25. Similarly, when using the second code C2 obtained by dividing the U component by a predetermined value, a decimal point may occur in the U component during the processing of the control device 25. In contrast, by using the first code C1 obtained by adding a first change amount to the U component of the captured image IM, no decimal point occurs in the U component. By using the second code C2 obtained by subtracting a second change amount from the U component of the captured image IM, no decimal point occurs in the U component. Therefore, the processing load on the control device 25 can be reduced.

[0034] (3) The control device 25 superimposes the first code C1, in which only the U component is changed, on the captured image IM. When both the U component and the V component are changed, two color difference components will be changed. In this case, when a plurality of captured images IM are continuously displayed, the first code C1 and the second code C2 are more easily visible than when only the U component is changed. By superimposing the first code C1, in which only the U component is changed, on the captured image IM, the visibility of the first code C1 and the second code C2 can be reduced.

[0035] [Modification Example] The embodiment can be implemented with the following modifications. The embodiment and the following modification examples can be implemented in combination with each other within a technically consistent range.

[0036] ○ The control device 25 may superimpose the first code C1, in which the V component among the three YUV components representing the captured image IM is changed by the first change amount, on the captured image IM obtained in step S1. In this case, the control device 25 superimposes the second code C2, in which the V component among the three YUV components representing the captured image IM is changed by the second change amount, on the captured image IM obtained in step S1. The second code C2 can be said to be a code in which the same component as the component changed by the first change amount is changed by the second change amount.

[0037] ○ The control device 25 may superimpose the first code C1, in which the U component and the V component among the three YUV components representing the captured image IM are changed by the first change amount, on the captured image IM obtained in step S1. At this time, the values of the first change amount for the U component and the V component may be different. In this case, the control device 25 superimposes the second code C2, in which the U component and the V component among the three YUV components representing the captured image IM are changed by the second change amount, on the captured image IM obtained in step S1. At this time, the values of the second change amount for the U component and the V component may be different. The second change amount corresponding to the U component is preferably the same value as the first change amount corresponding to the U component. The second change amount corresponding to the V component is preferably the same value as the first change amount corresponding to the V component.

[0038] ○The first change amount and the second change amount may be different values. In this case, the difference between the first change amount and the second change amount preferably falls within an allowable range. The larger the difference between the first change amount and the second change amount, the easier it is to visually recognize the first code C1 and the second code C2 when the captured image IM with the first code C1 superimposed and the captured image IM with the second code C2 superimposed are continuously displayed on the display unit. The allowable range is such that when the captured image IM with the first code C1 superimposed and the captured image IM with the second code C2 superimposed are continuously displayed on the display unit, the first code C1 and the second code C2 are difficult to visually recognize to the extent that the loom 10 can be observed.

[0039] ○The control device 25 may change at least one of the U component and the V component of the captured image IM by the first change amount by multiplying at least one of the U component and the V component of the captured image IM by a first predetermined value. The first predetermined value is a value greater than 1. The control device 25 may change at least one of the U component and the V component of the captured image IM by the second change amount by dividing at least one of the U component and the V component of the captured image IM by a second predetermined value. The second predetermined value is a value greater than 1. The first predetermined value and the second predetermined value may be the same value or different values. Any value can be used for the first predetermined value and the second predetermined value.

[0040] ○Superimposing the first code C1 on the captured image IM and superimposing the second code C2 on the captured image IM may be switched every predetermined number of sheets, or may be switched every plurality of sheets. For example, the control device 25 may switch between superimposing the first code C1 on the captured image IM and superimposing the second code C2 on the captured image IM every two sheets. In this way, superimposing the first code C1 on the captured image IM and superimposing the second code C2 on the captured image IM may be switched every certain number of sheets. Also, superimposing the first code C1 on the captured image IM and superimposing the second code C2 on the captured image IM may be switched for each different number of sheets. For example, the control device 25 may superimpose the first code C1 on two captured images IM and then superimpose the second code C2 on three captured images IM. Also, the predetermined number of sheets may be switched randomly.

[0041] ○The object to be photographed may be different from the loom 10.

Explanation of Signs

[0042] C1…First code, C2…Second code, IM…Photographed image, 20…Stroboscope, 22…Camera, 25…Control device, 30…Storage medium.

Claims

1. A method for storing a captured image obtained from a camera in a storage medium by a control device, comprising: the control device: obtaining the captured image; obtaining shooting conditions at the time when the captured image is obtained; superimposing on the captured image a first code in which at least one of a U component and a V component among three components of YUV representing the captured image is changed by adding a first change amount or multiplying by a first predetermined value, and the first code indicating the shooting conditions; when adding the first change amount to at least one of the U component and the V component, subtracting a second change amount from the same component as the component changed by the first change amount among the U component and the V component, and when multiplying at least one of the U component and the V component by the first predetermined value, dividing the same component by a second predetermined value, and superimposing on the captured image a second code in which the same component is changed by the second change amount and the second code indicating the shooting conditions; storing the captured image in the storage medium, wherein the superimposing of the first code on the captured image and the superimposing of the second code on the captured image are performed on a plurality of the captured images continuously obtained from the camera, and the superimposing of the first code on the captured image and the superimposing of the second code on the captured image are switched every predetermined number of sheets, the method for storing a captured image.

2. The control device: when superimposing the first code on the captured image, superimposing on the captured image the first code in which at least one of the U component and the V component is added with the first change amount; when superimposing the second code on the captured image, superimposing on the captured image the second code in which the second change amount is subtracted from the same component as the component changed by the first change amount among the U component and the V component, the method for storing a captured image according to claim 1.

3. The control device: when superimposing the first code on the captured image, superimposing on the captured image the first code in which one of the U component and the V component is changed by the first change amount, the method for storing a captured image according to claim 1 or claim 2.

4. A stroboscope comprising a camera and a control device, for storing a captured image obtained from the camera in a storage medium, wherein the control device: obtains the captured image, ... Obtain the shooting conditions at the time when the captured image is acquired. By adding a first change amount or multiplying by a first predetermined value to at least one of the U component and the V component among the three components of YUV representing the captured image, a first code in which at least one of the U component and the V component is changed by the first change amount, and the first code indicating the shooting conditions is superimposed on the captured image. When adding the first change amount to at least one of the U component and the V component, subtract a second change amount from the same component as the component changed by the first change amount among the U component and the V component. When multiplying at least one of the U component and the V component by the first predetermined value, divide the same component by a second predetermined value to change the same component by the second change amount, and a second code indicating the shooting conditions is superimposed on the captured image. Store the captured image in the storage medium. The superimposition of the first code on the captured image and the superimposition of the second code on the captured image are performed on a plurality of the captured images continuously acquired from the camera. The superimposition of the first code on the captured image and the superimposition of the second code on the captured image are switched every predetermined number of sheets, and are a stroboscope.

Images