TWI780623B - Optical mouse and its lifted state determining method - Google Patents

Abstract

The present invention relates to an optical mouse and its lifting state determining method. A first light signal and a second light signal of different magnitudes are emitted during the light-emitting period of the optical mouse. Corresponding to the first optical signal, the first reflected image is received. Corresponding to the second optical signal, the second reflected image is received. Comparing the illuminance reference values of the first and second reflected images to obtain a comparison result, and use the comparison result to determine whether the optical mouse is in a lifted state. Since the magnitude of the first optical signal and the second optical signal are different, it can be preset that the illuminance reference values of the received first and second reflected images are significantly different. If there is no significant difference in the comparison results, it can be clearly judged as a lifted state. Therefore, the accuracy of determining the lifted state of the optical mouse is effectively improved, and no additional components are required.

Description

Optical mouse and its lifting state judging method

The invention relates to an optical mouse, in particular to the technology for judging whether the optical mouse is in a raised state.

The optical mouse is a common input device used with electronic devices. Please refer to FIG. 14. When the optical mouse 90 is used, it is placed on the work surface 91 to move, and the light 92 emitted by the internal light source of the optical mouse 90 is irradiated. To the corresponding position 93 of the work surface 91, the reflected light 94 generated by the light 92 relative to the corresponding position 93 is reflected into the optical mouse 90, and then the sensing unit inside the optical mouse 90 captures the image of the corresponding position 93, The moving path of the optical mouse 90 is judged by analyzing the image, so as to correspond to the position of the cursor displayed on the control electronic device.

However, as shown in FIG. 15 , when the user lifts the optical mouse 90 during the movement and its bottom surface is not attached to the work surface 91, the light 92 emitted by the light source will be lifted along with the optical mouse 90. The divergence of the angle cannot be focused on one place, and the unfocused light is irradiated on the work surface 91 corresponding to the optical mouse 90. At this time, the sensing unit is limited by its angle and corresponding position, and the captured image is blurred. Or the brightness decreases, which will easily cause the electronic device to misjudge the moving path of the optical mouse 90 , and cause the displayed cursor to move uncontrolled by the user. Therefore, how to judge that the optical mouse is lifted, and It is an essential function of the optical mouse in the prior art that the electronic device can exclude the images captured in the lifted state to avoid misjudgment of the moving path. However, the detection methods used for judging the lifting state of the optical mouse in the prior art each have their own disadvantages.

In one of the existing technologies, the brightness change of the captured image is used to determine whether it is in the lifted state. However, if the work surface on which the optical mouse is attached and moved is a surface with high contrast, take a black and white desktop as an example. , when moving from a white place to a black place, the brightness will also drop sharply. At this time, the optical mouse may be misjudged as a lifted state due to the brightness drop of the captured image, resulting in the user's mouse movement Unable to react immediately on the cursor of the electronic device.

In another prior art, the blurred feature of the captured image is used to determine whether it is in the lifted state. However, if the working surface on which the optical mouse is attached and moved is a surface with obvious texture features, the optical mouse must be lifted. Blurred images can only be obtained when the temperature is high enough to a certain level; and if the working surface on which the optical mouse moves is a surface with less obvious texture features, blurred images may be obtained no matter whether it is raised or not, making it difficult to judge whether it is raised or not. up state.

In yet another prior art, the optical mouse of the prior art is equipped with a proximity sensor, and the proximity sensor independently emits light to the work surface to generate reflected light, by emitting light and receiving reflected light The time to judge the distance between the optical mouse and the work surface, and the judged distance can be used to know whether the mouse is lifted. However, although the addition of a distance sensor can accurately detect whether it is lifted, the addition of additional components will lead to a significant increase in the manufacturing cost of the optical mouse with this technology.

In view of this, the present invention improves on the shortcomings of the prior art that the judgment is not accurate enough or the cost is too high.

In order to achieve the aforementioned object of the invention, the present invention provides a method for judging the lifting state of an optical mouse, which includes at least one light-emitting period, wherein: in each of the light-emitting periods, a first light signal is emitted to obtain a first reflection image, and a second light signal to obtain a second reflection image, the magnitude of the first light signal is different from the magnitude of the second light signal; calculating a first illuminance of the first reflection image The reference value and a second illuminance reference value of the second reflection image are obtained, and a comparison result is obtained; and according to the comparison result, it is judged whether the optical mouse is in a lifted state.

The present invention further provides an optical mouse, which includes: a casing; a light source, which is arranged in the casing and provides light signals to the outside of the casing; a sensing unit, which is arranged in the casing and receives the light signal. The reflected light signal of the light signal; a control unit, which is arranged in the casing, the control unit controls the light source to provide the light signal, and generates a corresponding reflection image according to the reflected light signal received by the sensing unit , wherein the control unit executes at least one lighting cycle, wherein the control unit executes the aforementioned control method.

The advantage of the present invention is that, by emitting light signals with different magnitudes during the light-emitting period, the illuminance reference values of the reflected images captured corresponding to the light signals of different magnitudes are compared, and the obtained comparison results It can be judged whether the optical mouse is in the lifted state at this time, and the present invention can still maintain the accuracy of judging the lifted state without additional cost of components.

10: Shell

20: light source

21: light

30: Control unit

40: Sensing unit

50: work surface

T: light cycle

S ₁₁ , S ₁₂ : the first light signal

S ₂₁ , S ₂₂ : the second light signal

t ₁₁ , t ₁₂ : the first time

t ₂₁ , t ₂₂ : second time

Φ ₁₁ , Φ ₁₂ : the first luminous flux

Φ ₂₁ , Φ ₂₂ : Second luminous flux

I ₁₁ , I ₁₂ : first reflection image

I ₂₁ , I ₂₂ : second reflected image

90: Optical mouse

91: work surface

92: light

93: Corresponding position

94: reflected light

Fig. 1 is a schematic side view sectional view of the optical mouse of the present invention in a non-lifted state; Fig. 2 is a block diagram of some components of the optical mouse of the present invention; Fig. 3 is the first step of the control method of the optical mouse of the present invention The light-emitting sequence diagram of an embodiment; FIG. 4 is the light-emitting sequence diagram of the second embodiment of the control method of the optical mouse of the present invention; FIG. 5 is the light-emitting sequence of the third embodiment of the control method of the optical mouse of the present invention Figures; Figure 6 is a light-emitting sequence diagram of the fourth embodiment of the control method of the optical mouse of the present invention; Figure 7 is the light-emitting sequence and reflection of one of the implementations of the optical mouse in the non-lifted state Schematic diagram of image comparison; FIG. 8 is a side view cross-sectional schematic diagram of the optical mouse of the present invention in the lifted state; FIG. 9 is a light-emitting timing and reflection diagram of an embodiment of the optical mouse of the present invention in the lifted state Figure 10 to Figure 13 is a schematic diagram of the illuminance of each pixel of the reflected image captured by the present invention; Figure 14 is a side view schematic diagram of an optical mouse in the prior art in a non-lifted state; Figure 15 is a schematic diagram of the prior art Schematic diagram of the side view of the optical mouse in the lifted state.

The technical means adopted by the present invention to achieve the intended purpose of the invention are further elaborated below in conjunction with the drawings and embodiments of the present invention, wherein the drawings are simplified for illustrative purposes only, and by describing the relationship between elements and components of the present invention To illustrate the structure or method invention of the present invention, therefore, The components shown in the drawings are not presented in actual numbers, actual shapes, actual sizes, and actual ratios, and the sizes or size ratios have been enlarged or simplified to provide better illustrations, and the actual numbers, actual numbers, and actual ratios have been selectively designed and configured. shape or actual size ratio, while detailed component layouts may be more complex.

Please refer to FIG. 1 and FIG. 2 , the optical mouse 1 of the present invention includes a casing 10 , a light source 20 , a control unit 30 and a sensing unit 40 . The light source 20, the control unit 30 and the sensing unit 40 are all arranged in the housing 10, the light source 20 and the sensing unit 40 are electrically connected to the control unit 30, and the light 21 emitted by the light source 20 is directed toward the Outside the casing 10, that is, the light source 20 provides light signals to the outside of the casing 10. When the light 21 hits the working surface 50 placed on the bottom surface of the casing 10, the reflected light is received by the sensing unit 40, Then a corresponding reflected image is generated, and the moving distance of the optical mouse 1 is judged by the reflected image.

Please refer to FIG. 2 and FIG. 3, the control unit 30 controls the light source 20 to perform at least one lighting period T, and in each lighting period T, the light source 20 emits a plurality of first light signals _S11 and at least one The second optical signal S ₂₁ , wherein the time length for emitting the first optical signal S ₁₁ is a first time t ₁₁ , and the first optical signal S ₁₁ has a first luminous flux Φ ₁₁ , and the second optical signal S is emitted The time length of ₂₁ is a second time t ₂₁ , and the second optical signal S ₂₁ has a second luminous flux Φ ₂₁ . Moreover, the magnitude of the first optical signal _S11 is different from that of the second optical signal _S21 . In one embodiment, the magnitude refers to the optical energy of the optical signal, that is, the product of the luminous flux of the optical signal and the emission time , the luminous energy of the first optical signal S ₁₁ is equal to the product of the first time t ₁₁ and the first luminous flux Φ ₁₁ , and the luminous energy of the second optical signal S ₂₁ is equal to the second time t ₂₁ and the second luminous flux The product of Φ ₂₁ . Please refer to the embodiment shown in FIG. 3 , the first luminous flux Φ ₁₁ is equal to the second luminous flux Φ ₂₁ , but since the first time t ₁₁ is greater than the second time t ₂₁ , the first time t ₁₁ and the The product of the first light flux _Φ11 is greater than the product of the second time _t21 and the second light flux _Φ21 , so the magnitude of the first light signal _S11 is different from that of the second light signal _S21 . Please refer to the embodiment shown in Figure 4, the first time t ₁₂ is equal to the second time t ₂₂ , but the first luminous flux Φ ₁₂ is greater than the second luminous flux Φ ₂₂ , so the first time t ₁₂ and the second luminous flux Φ 22 The product of a luminous flux _Φ12 is larger than the product of the second time _t22 and the second luminous flux _Φ22 , so the magnitude of the first light signal _S12 is different from that of the second light signal _S22 . In other embodiments, it is also possible to make the first time different from the second time, the first luminous flux different from the second luminous flux, but make the product of the first time and the first luminous flux greater or smaller than the second The product of time and the second luminous flux can correspond to the difference between the magnitude of the first light signal and the magnitude of the second light signal.

Furthermore, in each of the light-emitting periods T, the times and ways of emitting the first light signal and the second light signal may have different implementations. Please refer to the embodiment shown in Figure 3, which is to emit multiple first light signals _S11 and multiple second light signals S21 (as shown in Figure ₃ , two first light signals _S11 and two second light signals light signal S ₂₁ ), and the first light signal S ₁₁ and the second light signal S ₁₂ are alternately emitted. Please refer to the embodiment shown in Figure 5, which is to emit multiple first light signals _S11 and one second light signal S21 (as shown in Figure ₅ , three first light signals _S11 and one second light signal S ₂₁ ). Please refer to the embodiment shown in Figure 6, which is to emit multiple second light signals S ₂₁ and one first light signal S ₁₁ (as shown in Figure 6, one first light signal S ₁₁ and three second light signals S ₂₁ ).

1 and 7, when the optical mouse 1 is normally placed on the work surface 50 for use, when the light source 20 emits the first light signal _S11 , the corresponding reflected light is received by the sensing unit 40 to generate a The first reflected image I ₁₁ ; when the light source 20 emits the second light signal S ₂₁ , the corresponding reflected light is received by the sensing unit 40 to generate a second reflected image I ₂₁ . Since the first light signal _S11 and the second light signal _S21 have different magnitudes, when irradiating the working surface 50, the reflected light corresponding to the first light signal _S11 and the second light signal _S21 is also If there are different sizes, the generated first reflected image _I11 and the second reflected image _I21 will have different illumination reference values. Taking Fig. ₇ as an example, the magnitude of the first light signal _S11 is larger than the magnitude of the second light signal S21, so it is preset that the first illuminance reference value of the first reflection image _I11 generated correspondingly will be greater than the first The second illuminance reference value of the reflection image _I21 . At this time, after calculating the first illuminance reference value of the first reflection image _I11 and the second illuminance reference value of the second reflection image _I21 , a comparison result is obtained. If the comparison result conforms to the first reflection If the first illuminance reference value of the image I ₁₁ is greater than the second illuminance reference value of the second reflection image I ₂₁ , it can be determined that the optical mouse 1 is placed on the work surface 50 instead of lifted. Even though the contrast of the working surface 50 is relatively high, or the texture features of the working surface 50 are not obvious, since the magnitudes of the first light signal _S11 and the second light signal _S21 are different, when the optical mouse 1 The illuminance reference value of the captured reflection image will still be affected by the magnitudes of the first light signal _S11 and the second light signal _S21 , so as to produce a difference in line with the preset result.

Please refer to FIG. 8 and FIG. 9, when the optical mouse 1 is lifted and not attached to the work surface 50, because the first light signal _S11 and the second light signal _S21 have diverged and no reflection is formed. light, so that the magnitudes of the first light signal _S11 and the second light signal S21 do not affect the illuminance reference values _of the first reflected image _I12 and the second reflected image _I22 , so no matter the For the first reflected image I ₁₂ generated by the first light signal S ₁₁ , or the second reflected image I ₂₂ generated corresponding to the second light signal S ₂₁ , the illuminance reference value only corresponds to the corresponding position on the current working surface 50 brightness. Therefore, at this time, the comparison result obtained after calculating the first illuminance reference value of the first reflection image _I11 and the second illuminance reference value of the second reflection image _I21 will be similar to each other. The illuminance reference value cannot meet the result that the first illuminance reference value of the first reflected image _I11 is greater than the second illuminance reference value of the second reflected image _I21 , so it can be judged that the optical mouse 1 is currently leaving the work surface 50, in a raised state.

The illuminance reference value may refer to an operational value related to the illuminance of all or some pixels in the reflected image, for example, if the illuminance of each pixel in the first reflected image I11 shown in FIG. ₇ As shown in Figure 10, if the illuminance of each pixel in the second reflected image I ₂₁ shown in Figure 7 is shown in Figure 11, if the illuminance of each pixel in the first reflected image I ₁₂ shown in Figure 9 As shown in FIG. 12, if the illuminance of each pixel in the second reflection image _I22 shown in FIG. 9 is as shown in FIG. 13, the illuminance shown in FIGS. limit the invention.

In one embodiment, the illuminance reference value is the sum of the illuminances of all the pixels of the reflected image, and the comparison result can be the sum of the illuminances of all the pixels of the first reflected image and the sum of the illuminances of all the pixels of the second reflected image. If the difference or ratio of the sum of the illuminances of all pixels is judged to be less than a threshold value, the optical mouse is judged to be in a raised state. Assuming that the threshold value of the difference is 5000 and the threshold value of the ratio is 5, from the reflection images obtained by the optical mouse 1 in the state of Fig. 1 and Fig. ₇ , the values of all pixels of the first reflection image I11 are The sum of the illuminance is 60649 (as shown in Figure 10), the sum of the illuminance of all the pixels of the second reflection image _I21 is 6164 (as shown in Figure 11), then its difference is 54485, and its ratio is 9.84, showing The difference between the total illuminance of the two is quite large, and the comparison result is greater than the preset threshold value, then it is judged that the optical mouse 1 is not in the lifted state; the reflection image obtained by the optical mouse 1 in the state shown in Figure 8 and Figure 9 From the point of view, the sum of the illuminance of all the pixels of the first reflected image I12 is ₁₇₈₄₄ (as shown in FIG. ₁₂ ), and the sum of the illuminance of all the pixels of the second reflected image I22 is 16942 (as shown in FIG. 13 As shown), the difference is 902, and the ratio is 1.05, which shows that the difference between the total illuminance of the two is very small, and the comparison result is less than the preset threshold value, and the optical mouse 1 is judged to be in the raised state.

In one embodiment, the illuminance reference value is the average illuminance value of all pixels in the reflected image, and the comparison result can be the sum of the illuminances of all pixels in the first reflected image and the second reflected image If the difference or ratio of the average illuminance values of all pixels in the image is judged to be less than a threshold value, it is judged that the optical mouse is in a raised state. Assuming that the threshold value of the difference is 500 and the threshold value of the ratio is 2, the illuminance of all pixels of the first reflected image I ₁₁ can be seen from the reflected images obtained by the optical mouse 1 in the state shown in Fig. 1 and Fig. 7 The average value is 6738.78 (as shown in Figure 10), the illuminance average value of all pixels of the second reflection image _I21 is 684.89 (as shown in Figure 11), then its difference is 6053.89, and its ratio is 9.84, showing The difference in the average illuminance between the two is quite large, and the comparison result is greater than the preset threshold value, then it is judged that the optical mouse 1 is not in the lifted state; the reflection images obtained by the optical mouse 1 in the state shown in Figure 8 and Figure 9 From the perspective of the image, the average illuminance of all pixels of the first reflected image I12 is 1982.67 (as shown in Figure ₁₂ ), and the sum of the illuminance of all pixels of the second reflected image I22 is _1882.44 (as shown in Figure 13 ), the difference is 100.23, and the ratio is 1.05, which shows that the difference between the average illuminance values of the two is very small, and the comparison result is less than the preset threshold value, and the optical mouse 1 is judged to be in the lifted state.

In one embodiment, the illuminance reference value may be the sum or average illuminance of some pixels of the reflection image, and the comparison result may be adjusted accordingly.

In one embodiment, the comparison result can be compared with the first optical signal and the second optical signal emitted in adjacent time sequences, or compared with any first optical signal and any second optical signal in the same period, Or compare the first light signal and the second light signal in different periods.

To sum up, by comparing the illuminance reference values of the reflected images of light signals of different sizes, it is judged whether it meets the preset comparison result, and if so, it is judged that the optical mouse is not in the lifted state , which is the normal use state attached to the work surface; if it does not match, it is judged that the optical mouse is in a raised state. At this time, the captured reflection image can be further ignored to avoid misjudging the movement of the optical mouse track. Therefore, without adding additional detection components, the optical mouse of the present invention can still accurately determine whether it is in a lifted state, and is not affected by the contrast and texture of the working surface.

The above description is only an embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with the embodiment, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field, Without departing from the scope of the technical solution of the present invention, when the technical content disclosed above can be used to make some changes or modifications to equivalent embodiments with equivalent changes, any Without departing from the content of the technical solution of the present invention, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to the scope of the technical solution of the present invention.

T: lighting period S ₁₁ : first light signal S ₂₁ : second light signal t ₁₁ : first time t ₂₁ : second time Φ ₁₁ : first luminous flux Φ ₂₁ : second luminous flux

Claims (18)

A method for judging the lifting state of an optical mouse, which includes at least one light-emitting period, wherein: in each of the light-emitting periods, a first light signal is emitted to obtain a first reflection image, and a second light signal is emitted obtaining a second reflection image, the magnitude of the first light signal is different from the magnitude of the second light signal; calculating a first illuminance reference value of the first reflection image and the second reflection image a second illumination reference value of the image and obtain a comparison result; and judge whether the optical mouse is in a raised state according to the comparison result. The method for judging the lifting state of an optical mouse as described in claim 1, wherein the first reference value of illumination and the second reference value of illumination are respectively obtained in different light-emitting periods. The method for judging the lift state of an optical mouse according to claim 1 or 2, wherein the second reflection image and the first reflection image are adjacent in time sequence. The method for judging the lifting state of an optical mouse as described in Claim 1, wherein in each light-emitting cycle, the first light signal and the second light signal are respectively emitted multiple times, and the first light signal and the second light signal are The second light signal is alternately emitted. The method for judging the lifting state of an optical mouse as described in claim 1, wherein: the emission time of the first light signal is a first time, and the first light signal provides a first luminous flux; the first light signal The emission time of the two light signals is a second time, and the second light signal provides a second luminous flux. The method for judging the lifting state of an optical mouse according to claim 5, wherein the first time is longer than the second time, and the first luminous flux is equal to the second luminous flux. The method for judging the lifting state of an optical mouse according to claim 5, wherein the first time is equal to the second time, and the first luminous flux is greater than the second luminous flux. The method for judging the lifting state of an optical mouse as described in claim 1, wherein the first illuminance reference value refers to the sum or average of the illuminance of all or some pixels of the first reflected image, and the second The illuminance reference value refers to the sum or average of the illuminance of all or some pixels of the second reflection image. The method for judging the lifting state of an optical mouse as described in claim 8, wherein the comparison result is the difference or ratio between the first illuminance reference value and the second illuminance reference value, if the comparison result is judged If it is less than a threshold value, it is judged that the optical mouse is in a raised state. An optical mouse, which includes: a casing; a light source, which is arranged in the casing and provides an optical signal to the outside of the casing; a sensing unit, which is arranged in the casing and receives the light signal Reflected light signal; a control unit, which is arranged in the housing, the control unit controls the light source to provide the light signal, and generates a corresponding reflection image according to the reflected light signal received by the sensing unit, wherein the control unit The unit execution steps include: controlling the light source to emit a first light signal to obtain a first reflection image, and controlling the light source to emit a second light signal to obtain a second reflection image, the magnitude of the first light signal different from the magnitude of the second optical signal; calculating a first illuminance reference value of the first reflected image and a second illuminance reference value of the second reflected image and obtaining a comparison result; and judging whether the optical mouse is lifted according to the comparison result state. The optical mouse according to claim 10, wherein the first illuminance reference value and the second illuminance reference value are respectively obtained in different lighting cycles. The optical mouse according to claim 10 or 11, wherein the second reflection image and the first reflection image are adjacent in time sequence. The optical mouse as described in claim 10, wherein the control unit emits the first light signal and the second light signal multiple times during each light-emitting cycle, and the first light signal and the second light signal The two light signals are emitted alternately. The optical mouse as described in claim 10, wherein: each emission time of the first optical signal is a first time, and the first optical signal provides a first luminous flux; the second optical signal Each emission time is a second time, and the second light signal provides a second luminous flux. The optical mouse according to claim 14, wherein the first time is greater than the second time, and the first luminous flux is equal to the second luminous flux. The optical mouse according to claim 14, wherein the first time is equal to the second time, and the first luminous flux is greater than the second luminous flux. The optical mouse as described in claim item 10, wherein the first reference value of illumination refers to the sum or average value of the illumination of all or some pixels of the first reflected image, and the second reference value of illumination refers to the The sum or average of the illuminance of all or some pixels of the second reflection image. The optical mouse as described in claim 17, wherein the comparison result is the difference or ratio between the first illuminance reference value and the second illuminance reference value, if it is judged that the comparison result is less than a threshold value, then It is judged that the optical mouse is lifted.

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