CN110611772A - Image capturing device for vehicle and exposure parameter setting method thereof - Google Patents
Image capturing device for vehicle and exposure parameter setting method thereof Download PDFInfo
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- CN110611772A CN110611772A CN201810618176.1A CN201810618176A CN110611772A CN 110611772 A CN110611772 A CN 110611772A CN 201810618176 A CN201810618176 A CN 201810618176A CN 110611772 A CN110611772 A CN 110611772A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
Abstract
The invention provides an image capturing device for a vehicle and an exposure parameter setting method thereof, wherein the image capturing device for the vehicle is suitable for being arranged on a first vehicle and comprises the following components: receiving at least one of a vehicle speed value of a first vehicle, a distance value between the first vehicle and a second vehicle and an afterimage moving amount of a second vehicle image, and selecting one of a plurality of exposure parameter functions according to the vehicle speed value, the distance value, the afterimage moving amount or a combination thereof of the first vehicle to determine an optimized parameter value; the exposure parameter setting method of the image capturing device for the vehicle is suitable for a first vehicle and comprises the following steps: receiving at least one of a vehicle speed value of the first vehicle, a distance value between the first vehicle and a second vehicle, and an afterimage shift amount of a second vehicle image, and selecting one of a plurality of exposure parameter functions according to the vehicle speed value, the distance value, the afterimage shift amount or a combination thereof to determine an optimized parameter value.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to an image capturing technology, and more particularly, to an image capturing device for a vehicle and an exposure parameter setting method thereof.
[ background of the invention ]
In daily life, most people rely on vehicles as transportation tools when going out, which leads to the gradual increase of vehicles, and the vehicles are indispensable transportation tools in the modern society. Since the road condition changes are difficult to predict, most of the current vehicles are equipped with image capturing devices for capturing the road conditions ahead of the vehicle or the vehicle.
At present, an image capturing device for a vehicle is mainly used for capturing a high dynamic scene of a fast moving vehicle. The image is captured with a fixed exposure value by an image capturing device for a vehicle. However, a high dynamic scene with a fixed exposure value can result in too low brightness of the image or blurred image of the moving vehicle, making the license plate information difficult to recognize.
[ summary of the invention ]
An embodiment of the present invention provides an exposure parameter setting method for an image capturing device for a vehicle, which is applicable to a first vehicle and includes: receiving at least one of a vehicle speed value of the first vehicle, a distance value between the first vehicle and a second vehicle, and an afterimage shift amount of a second vehicle image, and selecting one of a plurality of exposure parameter functions according to the vehicle speed value, the distance value, the afterimage shift amount or a combination thereof to determine an optimized parameter value.
An embodiment of the invention provides an image capturing device for a vehicle, which is suitable for a first vehicle and includes a vehicle distance sensor, an image capturing module, an image analyzing unit and a processing module. The vehicle distance sensor senses a distance value between the first vehicle and the second vehicle. The image capturing module captures a second vehicle image according to the exposure condition. The image analysis unit identifies the second vehicle image to determine the afterimage moving amount of the second vehicle image. The processing module selects one of a plurality of exposure parameter functions according to the speed value, the distance value, the residual image movement amount or the combination of the speed value, the distance value and the residual image movement amount of the first vehicle so as to determine an optimized parameter value.
In summary, the image capturing device for a vehicle and the setting method thereof according to the embodiments of the invention are applicable to a vehicle, and can select an appropriate exposure parameter function according to the vehicle speed of the vehicle, the distance value between the vehicle and the front vehicle, and the offset of the front vehicle, so as to determine the optimal parameter value according to the selected exposure parameter function.
[ description of the drawings ]
Fig. 1 is a block diagram of an image capturing device for a vehicle according to an embodiment of the invention.
FIG. 2 is a graph of shutter parameters with photosensitive parameters according to the present invention.
Fig. 3 is a flowchart illustrating a setting method of an image capturing device for a vehicle according to an embodiment of the invention.
Fig. 4 is a flowchart of an embodiment of step S102.
Fig. 5 is a flowchart illustrating a setting method of an image capturing device for a vehicle according to another embodiment of the invention.
[ detailed description ] embodiments
Fig. 1 is a block diagram of an image capturing device for a vehicle according to an embodiment of the invention. FIG. 2 is a graph of shutter parameters with photosensitive parameters according to the present invention. Fig. 3 is a flowchart illustrating a setting method of an image capturing device for a vehicle according to an embodiment of the invention.
For the purpose of clarity, the terms "first," "second," "third," and the like, as used herein, are used to distinguish one element, region, or section from another, the same or similar element, region, or section, but do not limit the particular element, region, or section.
The image-taking apparatus 100 for a vehicle is adapted to be provided on a vehicle (hereinafter referred to as a first vehicle). In some embodiments, the image capturing device 100 for a vehicle can be mounted on a first vehicle and capture a scene in front of the first vehicle, and the scene includes a second vehicle in front of the first vehicle.
The image capturing device 100 for the vehicle includes a vehicle distance sensor 110, an image capturing module 120, an image analyzing unit 130 and a processing module 140. The vehicle distance sensor 110, the image capturing module 120 and the image analyzing unit 130 are respectively connected to the processing module 140.
The vehicle distance sensor 110 senses a distance value between a first vehicle (own vehicle) and a second vehicle (preceding vehicle). In one embodiment, the distance sensor 110 senses a relative distance between a front end of the first vehicle and a rear end of the second vehicle. In one embodiment, the vehicle distance sensor 110 may be an infrared emitter, an infrared distance sensor, an ultrasonic sensor, or a combination thereof.
The image capturing module 120 captures a scene in front of the first vehicle according to an exposure condition to generate a second vehicle image. In an implementation aspect, the image capturing module 120 may be a camera lens.
After receiving the second vehicle image, the image analysis unit 130 performs image recognition on the second vehicle image to determine an afterimage moving amount of the second vehicle image. Wherein the afterimage moving amount refers to an offset amount of the second vehicle. In one implementation aspect, the offset amount is a displacement amount of the advancing direction of the second vehicle relative to the advancing direction of the first vehicle. For example, the offset amount may be a left displacement amount, a right displacement amount, a left front displacement amount, a right front displacement amount, a left rear displacement amount, or a right rear displacement amount of the forward direction of the second vehicle with respect to the forward direction of the first vehicle. In one embodiment, the image analysis unit 130 may be an image signal processing chip (ISP).
Referring to fig. 1 and 3, the processing module 140 receives a vehicle speed value of the first vehicle, a distance value between the first vehicle and the second vehicle sensed by the vehicle distance sensor 110, an image sticking movement amount of the image analysis unit 130 (step S101), or a combination thereof, and selects one of a plurality of exposure parameter functions according to the vehicle speed value, the distance value, the image sticking movement amount, or the combination thereof to determine an optimized parameter value (step S102). Here, the processing module 140 may select the exposure parameter function according to the vehicle speed value, the distance value, and the amount of afterimage shift, or the processing module 140 may select the exposure parameter function according to any one or two of the vehicle speed value, the distance value, and the amount of afterimage shift. In one embodiment, the processing module 140 can be a microprocessor, a microcontroller, a digital signal processor, a central processing unit, or any analog and/or digital device that operates on signals based on operational instructions.
In an implementation aspect, the step S101 of receiving the afterimage moving amount of the second vehicle image may be performed by first capturing a scene in front of the first vehicle according to an exposure condition by the image capturing module 120 to generate the second vehicle image, and then performing image recognition on the second vehicle image by the image analysis unit 130 to determine the afterimage moving amount.
In one embodiment, the vehicle speed value is from a GPS module or an on-board diagnostic system. In other words, the image capturing device 100 for vehicle may further include a GPS module or an on-board diagnostic system, and the GPS module or the on-board diagnostic system is coupled to the processing module 140.
In one embodiment, the exposure condition may include a shutter parameter and a photosensitive parameter. Here, the exposure parameter functions are a plurality of look-up tables representing the corresponding relationship between the shutter parameter and the photosensitive parameter, or the exposure parameter functions may be a plurality of preset function patterns representing the corresponding relationship between the shutter parameter and the photosensitive parameter. In one example, as shown in fig. 2, when the exposure parameter functions are implemented as predetermined function patterns, the exposure parameter functions may be predetermined function patterns having different slopes and/or curvatures. The preset function graph can be a straight line, a curve or a combination thereof. It should be noted that the number of the exposure parameter functions f1-f4 shown in fig. 2 is only an example, and not a limitation to the scope of the present invention, wherein for the predetermined function graphs f1-f4 corresponding to exposure values of both the shutter parameter and the photosensitive parameter, if the first vehicle speed is slow, a straight line or a curve with a small initial slope is selected, and conversely, if the first vehicle speed is fast, a straight line or a curve with a large initial slope is selected.
In another embodiment, the exposure condition includes an aperture parameter, a shutter parameter, and a photosensitive parameter. Here, the exposure parameter functions are a plurality of look-up tables representing the corresponding relationship among the aperture parameter, the shutter parameter and the photosensitive parameter, or a plurality of preset function patterns representing the corresponding relationship among the aperture parameter, the shutter parameter and the photosensitive parameter with different slopes and curvatures. The predetermined function graph can be a point, a continuous or discontinuous line segment, or a combination thereof, wherein the line segment can have various slopes or curvatures.
In one embodiment, the relationship between the vehicle speed value, the distance value, the amount of motion artifact or a combination thereof and the exposure parameter function may be recorded in a look-up table. In one embodiment, the lookup table may be stored in a storage module of the image capturing device 100 for a vehicle. In other words, the image capturing device 100 for vehicle further includes a storage module (not shown), and the storage module is coupled to the processing module 140.
For example, in the first example, assuming that the processing module 140 selects the corresponding exposure parameter function based on the vehicle speed value, the distance value and the amount of afterimage shift in step S102, the lookup table records the corresponding relationship among different vehicle speed values, different distance values, different amounts of afterimage shift and the exposure parameter functions f1-f 4. The processing module 140 finds out a corresponding exposure parameter function from the lookup table according to the sensed vehicle speed value, the sensed distance value, and the sensed residual image shift amount.
In the second example, assuming that the processing module 140 selects the corresponding exposure parameter function based on the vehicle speed value in step S102, the lookup table records the corresponding relationship between different vehicle speed values and the exposure parameter functions f1-f 4. The processing module 140 finds out a corresponding exposure parameter function from the lookup table according to the sensed vehicle speed value.
In the third exemplary embodiment, assuming that the processing module 140 selects the corresponding exposure parameter function based on the distance value in step S102, the lookup table records the corresponding relationship between different distance values and the exposure parameter functions f1-f 4. The processing module 140 finds out a corresponding exposure parameter function in the lookup table according to the sensed distance value.
In the fourth exemplary embodiment, assuming that the processing module 140 selects the corresponding exposure parameter function based on the motion blur amount in step S102, the lookup table records the corresponding relationship between different motion blur amounts and the exposure parameter functions f1-f 4. The processing module 140 finds out a corresponding exposure parameter function from the look-up table according to the sensed residual image shift amount.
In a fifth example, assuming that the processing module 140 selects the corresponding exposure parameter function based on the vehicle speed value and the distance value in step S102, the lookup table records the corresponding relationship between different vehicle speed values, different distance values and the exposure parameter functions f1-f 4. The processing module 140 finds out a corresponding exposure parameter function from the lookup table according to the sensed vehicle speed value and the sensed distance value.
In a sixth exemplary embodiment, assuming that the processing module 140 selects the corresponding exposure parameter function based on the distance value and the afterimage shift amount in step S102, the lookup table records the corresponding relationship between different distance values, different afterimage shift amounts and the exposure parameter functions f1-f 4. The processing module 140 finds out a corresponding exposure parameter function from the lookup table according to the sensed distance value and the residual image shift amount.
In a seventh example, assuming that the processing module 140 selects a corresponding exposure parameter function based on the vehicle speed value and the afterimage moving amount in step S102, the lookup table records the corresponding relationship between different vehicle speed values, different afterimage moving amounts and the exposure parameter functions f1-f 4. The processing module 140 finds out a corresponding exposure parameter function from the lookup table according to the sensed vehicle speed value and the amount of motion of the afterimage.
In an embodiment, the processing module 140 may further determine a parameter setting value according to an exposure value of the second vehicle image and the selected exposure parameter function, and the parameter setting value is the optimized parameter value. And the processing module 140 resets the exposure condition of the image capturing module 120 according to the parameter setting value.
In an embodiment, the vehicle distance sensor 110, the image capturing module 120, the image analyzing unit 130 and the processing module 140 may be integrated into a same image capturing device.
In another embodiment, the image capturing module 120, the image analyzing unit 130 and the processing module 140 may be integrated into a same image capturing device, and the vehicle distance sensor 110 may be additionally disposed on the first vehicle and in signal connection with the image capturing device.
Fig. 4 is a flowchart of an embodiment of step S102. Referring to fig. 4, in another embodiment, the selecting one of the exposure parameter functions according to the vehicle speed value, the distance value, the afterimage moving amount, or the combination thereof (step S102) may include comparing at least one of the vehicle speed threshold value and the vehicle speed value to obtain a vehicle speed analysis result, at least one of the distance threshold value and the distance value to obtain a distance analysis result, at least one of the moving threshold value and the afterimage moving amount to obtain at least one of a moving analysis result (step S1022), and selecting one of the exposure parameter functions according to the vehicle speed analysis result, the distance analysis result, the moving analysis result, or the combination thereof (step S1024).
In step S1022, the processing module 220 may compare the vehicle speed value, the distance value, and the amount of motion of the afterimage with the threshold values respectively to obtain three analysis results, or alternatively, the processing module 140 may compare any two or one of the vehicle speed value, the distance value, and the amount of motion of the afterimage with the corresponding threshold values to obtain two analysis results or one analysis result.
In one embodiment, the vehicle speed threshold may include one or more vehicle speed thresholds, such as: a single vehicle speed threshold, or a combination of two vehicle speed thresholds, or a combination of three or more vehicle speed thresholds, etc. In one embodiment, the vehicle speed threshold includes two vehicle speed thresholds, such as a first vehicle speed threshold and a second vehicle speed threshold, and the first vehicle speed threshold is greater than the second vehicle speed threshold. The vehicle speed analysis result can be a judgment result that the vehicle speed value is greater than the first vehicle speed critical value, or a judgment result that the vehicle speed value is less than the second vehicle speed critical value, or a judgment result that the vehicle speed value is in an interval formed by the first vehicle speed critical value and the second vehicle speed critical value.
In one embodiment, the distance threshold may include one or more distance thresholds, such as: a single distance threshold, or a combination of two distance thresholds, or a combination of three or more distance thresholds, etc. In one embodiment, the distance threshold includes two distance thresholds, such as a first vehicle speed threshold and a second distance threshold, and the first distance threshold is greater than the second vehicle speed threshold. The distance analysis result may be a determination result that the distance value is greater than the first distance threshold, a determination result that the distance value is less than the second distance threshold, or a determination result that the distance value is within an interval formed by the first distance threshold and the second distance threshold.
In one embodiment, the motion threshold may include one or more motion thresholds, such as: a single shift threshold, a combination of two shift thresholds, a combination of more than three shift thresholds, etc. In one embodiment, the motion threshold includes two motion thresholds, such as a first motion threshold and a second motion threshold, and the first motion threshold is greater than the second motion threshold. The motion analysis result can be a judgment result that the motion amount of the residual image is larger than a first motion critical value, a judgment result that the motion amount of the residual image is smaller than a second motion critical value, or a judgment result that the motion amount of the residual image is in an interval formed by the first motion critical value and the second motion critical value.
In step S1024, the processing module 140 selects one of a plurality of exposure parameter functions according to the vehicle speed analysis result, the distance analysis result, the movement analysis result, or the combination thereof. In one embodiment, the vehicle speed analysis result, the distance analysis result, the movement analysis result, or a combination thereof is associated with one of the exposure parameter functions. In another embodiment, the relationship between the vehicle speed value, the distance value, the amount of motion artifact or a combination thereof and the exposure parameter function can be recorded in a look-up table.
In one example, the processing module 140 selects one of several exposure parameter functions based on the vehicle speed analysis. Here, if the vehicle speed threshold includes a first vehicle speed threshold and a second vehicle speed threshold, and the first vehicle speed threshold is greater than the second moving threshold, when the vehicle speed analysis result is a determination result that the vehicle speed value is greater than the first vehicle speed threshold, that is, the first vehicle speed is faster, the processing module 140 selects the exposure parameter function f1 (a straight line or a curve with a large initial slope) according to the vehicle speed analysis result. When the vehicle speed analysis result is a determination result that the vehicle speed value is smaller than the second vehicle speed threshold value, that is, the first vehicle is slower in speed, the processing module 140 selects the exposure parameter function f4 (a line or a curve with a small initial slope) according to the vehicle speed analysis result.
As another example, the processing module 140 selects one of a plurality of exposure parameter functions according to the vehicle speed analysis result, the distance analysis result, and the movement analysis result. If the vehicle speed threshold value comprises a first vehicle speed critical value and a second vehicle speed critical value, and the first vehicle speed critical value is greater than the second vehicle speed critical value; if the distance threshold comprises a first distance critical value and a second distance critical value, and the first distance critical value is larger than the second distance critical value; and if the moving threshold comprises a first moving threshold and a second moving threshold, and the first moving threshold is larger than the second moving threshold. When the vehicle speed analysis result is a determination result that the vehicle speed value is greater than the first vehicle speed threshold, the distance analysis result is a determination result that the distance value is greater than the first distance threshold, and the movement analysis result is a determination result that the ghost movement amount is greater than the first movement threshold, the processing module 140 selects the exposure parameter function f1 (a straight line or a curve with a large initial slope) according to the vehicle speed analysis result, the distance analysis result, and the movement analysis result. When the vehicle speed analysis result is the determination result that the vehicle speed value is smaller than the second vehicle speed threshold, the determination result that the distance value is smaller than the second moving threshold, and the determination result that the ghost moving amount is smaller than the second moving threshold, the processing module 140 selects the exposure parameter function f4 (a line or a curve with a small initial slope) according to the vehicle speed analysis result.
Fig. 5 is a flowchart illustrating a setting method of an image capturing device for a vehicle according to another embodiment of the invention. Referring to fig. 5, in an embodiment, the method for setting the image capturing device for the vehicle further includes obtaining an exposure value of a second vehicle image (step S103), determining a parameter setting value according to the exposure value and the selected exposure parameter function (step S104), resetting an exposure condition according to the parameter setting value (step S105), and re-capturing the second vehicle image according to the reset exposure condition (step S106). The steps S101 and S102 are substantially the same as described above, and therefore are not described herein again.
In step S103, in an implementation aspect, the vehicular image capturing device 100 performs a photometric process on the scene to obtain an exposure value of the second vehicle image. For example, in the photometric process, the processing module 140 causes the image capturing module 120 to capture an image of a scene to obtain a driving image, and then the image analyzing unit 130 receives and analyzes the driving image to obtain an exposure value. In an example, the image analysis unit 130 may calculate the brightness of all pixels in the driving image to obtain the exposure value. In another embodiment, the image analysis unit 130 may find a second vehicle image in the driving image and calculate an exposure value from the brightness of the pixels of the second vehicle image.
In step S104, the processing module 140 determines a parameter setting value as an optimized parameter value according to the exposure value and the selected exposure parameter function.
In one embodiment, the processing module 140 may determine the parameter setting value through an algorithm.
In one embodiment, as shown in fig. 2, when the exposure condition includes a shutter parameter and a photosensitive parameter and the exposure parameter functions are a plurality of predetermined function graphs representing the corresponding relationship between the shutter parameter and the photosensitive parameter with different slopes and curvatures, the processing module 140 finds out the corresponding shutter parameter and the corresponding photosensitive parameter as the parameter setting values according to the exposure value based on the selected exposure parameter function. That is, the parameter setting values are a shutter parameter and a photosensitive parameter corresponding to a specific point in the selected exposure parameter function (for example, one of the exposure parameter functions f1-f4 shown in fig. 2).
In another embodiment, when the exposure condition includes an aperture parameter, a shutter parameter and a photosensitive parameter, and the exposure parameter functions are a plurality of predetermined function graphs representing the corresponding relationship among the aperture parameter, the shutter parameter and the photosensitive parameter with different slopes and curvatures, the processing module 140 finds the aperture parameter corresponding to the shutter parameter and the corresponding photosensitive parameter as the parameter setting values according to the exposure value based on the selected exposure parameter function. That is, the parameter setting value is an aperture parameter, a shutter parameter and a photosensitive parameter corresponding to a specific point in the selected exposure parameter function.
In an embodiment of step S105, the processing module 140 resets the exposure condition of the image capturing module 120 with the parameter setting value.
In an embodiment of step S106, the image capturing module 120 recaptures the second vehicle image according to the reset exposure condition.
In summary, the image capturing device for a vehicle and the setting method thereof according to the embodiments of the invention are applicable to a vehicle, and can select an appropriate exposure parameter function according to the vehicle speed of the vehicle, the distance between the vehicle and the front vehicle, and the offset of the front vehicle, so as to determine the optimal parameter value according to the selected exposure parameter function.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. An exposure parameter setting method for an image capturing device for a vehicle, which is suitable for a first vehicle, is characterized in that the exposure parameter setting method for the image capturing device for the vehicle comprises the following steps:
receiving at least one of a vehicle speed value of the first vehicle, a distance value between the first vehicle and a second vehicle, and an afterimage moving amount of a second vehicle image; and
one of a plurality of exposure parameter functions is selected according to the vehicle speed value, the distance value, the residual image shift amount or the combination thereof to determine an optimized parameter value.
2. The method as claimed in claim 1, wherein the step of receiving the motion of afterimage of the second vehicle image comprises:
shooting a scene according to an exposure condition to generate a driving image, wherein the driving image comprises a vehicle image of the second vehicle; and
and carrying out image recognition on the driving image to obtain the residual image movement amount of the vehicle image.
3. The method for setting exposure parameters of an image capturing device for vehicles as claimed in claim 2, comprising:
obtaining an exposure value according to the driving image;
determining a parameter setting value according to the exposure value and the selected exposure parameter function;
resetting the exposure condition according to the parameter setting value; and
and re-capturing the second vehicle image according to the reset exposure condition.
4. The method as claimed in claim 3, wherein the exposure condition comprises a shutter parameter and a photosensitive parameter, the exposure parameter functions are a plurality of lookup tables representing the corresponding relationship between the shutter parameter and the photosensitive parameter or a plurality of predetermined function graphs representing the corresponding relationship between the shutter parameter and the photosensitive parameter with different slopes and curvatures, and the step of determining the parameter setting value according to the exposure value and the selected exposure parameter function comprises:
and finding out corresponding shutter parameters and corresponding photosensitive parameters according to the exposure value based on the selected exposure parameter function.
5. The method as claimed in claim 3, wherein the exposure condition includes an aperture parameter, a shutter parameter and a photo-sensing parameter, the exposure parameter functions are a plurality of lookup tables representing the relationship between the aperture parameter, the shutter parameter and the photo-sensing parameter or a plurality of predetermined function graphs representing the aperture parameter, the shutter parameter and the photo-sensing parameter with different slopes and curvatures, and the step of determining the parameter setting value according to the exposure value and the selected exposure parameter function comprises:
and finding out corresponding aperture parameters, corresponding shutter parameters and corresponding photosensitive parameters according to the exposure value based on the selected exposure parameter function.
6. The method as claimed in claim 1, wherein the step of selecting one of a plurality of exposure parameter functions according to the vehicle speed, the distance or the afterimage shift amount comprises:
comparing at least one vehicle speed threshold value with the vehicle speed value to obtain a vehicle speed analysis result, at least one distance threshold value with the distance value to obtain a distance analysis result, at least one moving threshold value and the residual image moving amount to obtain at least one of a moving analysis result; and
one of a plurality of exposure parameter functions is selected according to the vehicle speed analysis result, the distance analysis result, the movement analysis result or the combination thereof.
7. An image capturing device for a vehicle, adapted to be mounted on a first vehicle, the image capturing device for a vehicle comprising:
a distance sensor for sensing a distance between the first vehicle and a second vehicle;
an image capturing module for capturing a second vehicle image according to an exposure condition;
an image analysis unit for identifying the second vehicle image to determine a residual image moving amount of the second vehicle image; and
a processing module, selecting one of a plurality of exposure parameter functions according to a vehicle speed value, the distance value, the residual image movement amount or a combination thereof of the first vehicle to determine an optimized parameter value.
8. The image capturing device as claimed in claim 7, wherein the processing module determines a parameter setting according to an exposure value of the second vehicle image and the selected exposure parameter function, and resets the exposure condition according to the parameter setting.
9. The image capturing apparatus for vehicle as claimed in claim 7, wherein the exposure condition includes an aperture parameter, a shutter parameter and a photo-sensing parameter, and the exposure parameter functions are a plurality of lookup tables corresponding to exposure values of both the shutter parameter and the photo-sensing parameter or a plurality of predetermined function graphs with different slopes and curvatures.
10. The image capturing apparatus for vehicle as claimed in claim 7, wherein the exposure condition includes an aperture parameter, a shutter parameter and a photo-sensing parameter, and the exposure parameter functions are a plurality of lookup tables corresponding to exposure values of both the aperture parameter and the photo-sensing parameter or a plurality of predetermined function graphs with different slopes and curvatures.
11. The image capturing apparatus for vehicle as claimed in claim 7, wherein the vehicle speed value is from a GPS module or a vehicle-mounted diagnostic system.
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| TWI787888B (en) * | 2021-06-29 | 2022-12-21 | 正修學校財團法人正修科技大學 | Image coparison system for car |
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