TW466377B - Method to calibrate the transmission gap of camera - Google Patents

Abstract

A method to calibrate the transmission gap of camera is disclosed, wherein the lens is automatically focused from left to right in a fixed environment, and is automatically focused from right to left backward. The evaluation value of the captured image information by CCD is computed. After the variation of the evaluation curve is read, the difference value in the backward direction of the gear gap can be defined after comparing the variation of two groups of evaluation curves; and then proceed the automatic focusing by the same method, i.e. from right to left, and from left to right backward; define the difference in the forward direction of the gear gap from two groups of evaluation curve; increase the backward difference value or the forward difference value according to the moving direction of zoom lens when the motor runs and rotates backward after the counting is excluded; increase the backward difference value or the forward difference value when the motor rotates backward without the counting. Thereby the error resulted from the gear gap can be eliminated.

Description

V. Description of the invention (1) The present invention relates to a method for correcting the gap of a camera transmission gear, and in particular relates to the use of two sets of evaluation values to define the reverse difference value and the forward difference value of the gear clearance. Corrector. The moment the gear of the zoom lens in the camera is changed from forward rotation to reverse rotation or reverse rotation to forward rotation, there will be a situation where the gear has been rotated and the lens has not moved. This is the problem of camera transmission clearance. Only after the gears continue to rotate to overcome the gear gap will the lens be moved. In order to overcome the problem of camera transmission gap, it is generally used to reverse the displacement to eliminate the transmission error caused by the wheel gap. Please refer to Figure 1. The implementation method is to move the zoom lens from point A to point B. When moving from point B to point c, the travel path is first from point A to point B ', then from point B to point D, and then from point D to point C. Although this method can eliminate the problems caused by the backlash of the gear, it takes a longer path to take a longer time, and it requires more reversal to easily damage the motor and reduce the life of the motor. In order to improve the lack of normal camera transmission clearance correction methods, "After repeated research by the inventor, the main purpose of this document f: Ming is to provide a camera transmission clearance correction method, which can effectively eliminate the problems caused by gear clearance, and can simplify changes. : The operation procedure, saving time and reducing motor wear, and prolonging the life of the motor. 0 Other purposes, effects and sounds of the present invention are described as follows: For power management and embodiments, please refer to the detailed drawings for a brief description: Figure 1 is Schematic diagram of the zoom lens movement path in the conventional gap correction method.

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V. Description of the invention (2) ^ This is a schematic diagram of the evaluation value curve of the present invention. Circle 3 is a schematic diagram of the reverse difference correction sounding β difference value of the present invention. Figure 4 shows the evaluation value curve of the present invention / Figure 5 shows the forward difference correction of the present invention = a schematic diagram of the positive difference value β circle 6 is the zoom lens path of the method of the present invention Figure 7 shows the method of the present invention and the conventional gap. The diameter comparison is round. Correction method of the zoom lens movement method of the camera transmission gap of the present invention A. Make the zoom lens from the left end to the right in a fixed environment: the next step: autofocus from the right end to the left, calculate the autofocus, and then reverse the value, Compare the two sets of evaluation value curves: the difference 'records the difference and defines it as the gear "2 = makes the zoom lens in a fixed environment from the right end to the left from the left end to the right autofocus' calculate the twenty materials captured by the CCD' and then The reversal value is compared with the difference between the evaluation of the motor 枓 corresponding to the maximum of the two sets of evaluation value curves. The difference is recorded and defined as the gear clearance β value. 丨 Stop difference C. When the motor is running, it increases according to the direction of the zoom lens. The running difference or forward difference value is not included in the count and then reversed. The $ file is increased after the run and the reverse difference value or the forward difference count is increased. The value is not listed The invention can be applied to digital camera transmission Gap correction—if the camera is equipped with a CCD, the evaluation of the image data captured in the CCD sampling area can be calculated.

Page 5 4 'Fifth, the description of the invention (3) ---... The invention can be applied to correct the transmission clearance. Generally, the zoom lens of the camera is driven by a step motor (Pulse moter) or a voltage motor (DC motor). Therefore, the motor drive value can be expressed by the number of rotation steps of the step motor or the voltage value of the voltage motor. And the reverse difference value or the forward difference value can be expressed by the number of two rotation steps of the step drive motor or the difference between the two voltage values of the voltage motor. The present invention may also perform only one of the steps Λ or b, and define the obtained reverse difference value or forward difference value as the corrected difference value 'as the reverse difference value or the positive value used to correct the gear clearance in step C. The value of the difference. Please refer to FIG. 2, the step-by-step motor drives the zoom lens to perform step eight to get the relationship between the evaluation value and the number of steps of the step-drive motor rotation. The upper curve is the evaluation value obtained when the zoom lens travels from the left end to the right. The maximum value (focus point) of this evaluation value curve appears at the position where the number of steps of the step drive motor is 56. The lower curve is the evaluation value curve obtained when the zoom lens is turned from the right end to the left end, and the evaluation value The maximum value (focus point) of the curve appears at the position where the number of steps of the step drive motor is 54, and the evaluation value is equivalent when the number of steps of the step drive motor is 62, 61, 60. In fact, the zoom lens has not actually been driven to move backwards. The zoom lens does not start to move until the number of steps is 60. Comparing the difference between the motor transmission values corresponding to the maximum of the two sets of evaluation value curves, that is, 56-54 = 2, the reverse gap value can be obtained in two steps. That is, when the step drive motor drives the zoom lens to move from left to right and then reverse it to the left, the first two steps after the reversal are not caused by the gear backlash. Please refer to the one shown in FIG. 3, in order to eliminate the backlash, the method of the present invention

Page 6 V. Description of the invention (4) Step C is to make the step drive motor drive the zoom lens to move from the left end to the right. Before the reversal, increase the two steps and the number of the two steps is not included in the count. #Value curve), and then increase the second step of operation after the reversal and the number of the two steps is not included in the count (as shown in the lower evaluation value curve in Figure 3), so that the gear backlash can be eliminated Transmission error. In the same way, please refer to the one shown in Figure 4. The forward gap value can be obtained by one step p. To eliminate this forward gap, the step drive motor is required to drive the zoom lens from the right end to the left and then run the second before reversing. The number of steps is not included in the count (as shown in the upper evaluation value curve in FIG. 5), and after the reversal, the first two steps are run and not included in the count (as shown in the lower evaluation value curve in FIG. 5), so That is, the transmission error a caused by the forward clearance of the gear can be eliminated. «Green Refer to the one shown in Figure 6 and apply the method of the present invention to move the zoom lens from point A to point B and then from point B to point c. , Its travel path is first moved from point A to point b, then from point β to the right, and then the number of steps of the reverse difference value is not changed. After entering the count, it moves to point E, and then runs from the point E to reverse. Step of reverse difference value, and move to point c after not counting. Compared with the travel path of the conventional zoom chain head = 2 gear gap shown in FIG. 丨, the zoom lens of the conventional method needs to be reversed twice while the zoom lens of the present invention only needs to be reversed once, which can reduce one reversal. For a shorter travel path, please refer to the one shown in FIG. 7. Using the method of the present invention, the difference j can be more clearly seen in the focusing strategy of the digital camera coarse scan. For example, in the traditional way, the zoom lens is first scanned from the point A to the point E. From the obtained evaluation values of points A, B, C, D, and E, it is known that the focus point is between the point D and the zoom lens. Move back to ㈣ and perform a fine sweep from ^ to ⑽. It is learned that the highest evaluation value of point F is the focus point (such as the bang price above circle 7)

466377 V. Description of the invention (5)-the one shown by the value curve); then move the zoom lens to the F point to complete the focusing process, if the traditional way the zoom lens needs to travel back and forth along the path shown), and apply The method of the present invention can simplify \ two times (travel path shown by the solid line), the method of the present invention is more capable, focusing time and reducing the loss of the motor. The present invention can effectively eliminate the transmission gap of the camera, and can simplify the head movement procedure to save time and reduce the wear of the motor and extend the horse. The above is just to use the technical content of the present invention. The scope of the patent for modification and change of invention claims is not limited to those disclosed in the embodiments. In summary, the present invention is different from the conventional camera transmission gap correction, and has an improved effect. AirPlus Society β >. The above pair (such as the dashed line ¥ only back and forth greatly shortens the lifetime of the zoom lens. In this case, any of them is the present method.

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Claims (1)

46637 7 Six 'patent application scope 1 · A camera drive A · Make the zoom lens self-value from the right end to the left, compare the difference between the two groups, record the value; B. Make the zoom lens self-value from the left end to the right, compare two Group difference, record value; Gap calibration fixed ring dynamic focus evaluation value The difference fixed ring dynamic focus evaluation value The difference positive method includes the following steps: Under the environment, autofocus from the left end to the right, and then reverse, calculate the CCD capture The maximum value of the evaluation curve of the image data corresponds to the amount of motor drive value and is defined as the auto-focus from the right end to the left under the reverse difference of the gear clearance, and then reversed to calculate the maximum of the evaluation curve of the image data captured by the CCD. The value corresponding to the value of the motor transmission value is not defined as the positive difference C between the wheels. When the motor is running, the reverse difference value or the positive difference value is increased according to the direction of travel of the zoom lens and is not included in the count. After the rotation, the reverse difference value or the forward difference value is increased and counted after the reverse run. 2. A method for correcting camera drive clearance, including the following steps. A_ Make the zoom lens autofocus from the right end to the left and then reverse the autofocus from the left end to the right in a fixed environment. Calculate the evaluation value of the image data captured by the CCD. , Compare the difference between the two sets of evaluation value curves corresponding to the maximum and maximum values of the motor drive value, record the difference and define it as the positive difference of the gear clearance; B. Make the zoom lens from the left end to the right under a fixed environment Autofocus, and then reverse the autofocus from the right end to the left, calculate the evaluation value of the image data captured by the CCD, and compare the motor drive values corresponding to the maximum of the two sets of evaluation value curves. 4γ6 6 37-VI. Application scope of patent = difference, record the amount of difference and define it as the reverse difference between the gears. C. When the motor is running, praise the difference value or positive difference value according to the zoom lens and it is not included in the direction. After running, first increase the reverse count. 3. A camera transmission gap correction method A. Make the zoom lens self-reverse in the fixed environment from the other end to the right or left to automatically evaluate the data, compare the differences between the two sets of measured transmission values, and record the correction difference value; B · When the motor is running, increase the running time and then reverse the rotation. To be reversed reverse operation and not included in the count. Β The direction of travel is increased. The reverse difference count is counted and then reversed. The reverse difference value or forward direction is to be reversed. The difference value is not listed, including the following steps: One end is left or right to autofocus, and then focus. 'Calculate the amount of horse difference corresponding to the maximum value of the value curve of the image captured by the CCD and define it as the corrected difference value of the gear gap and not included. After counting, first increase the correction difference value. 4 · The camera transmission gap correction method described in item 1, 2, or 3 of the patent application scope ', wherein the camera is a camera with a coefficient or a normal camera with a CCD. 5-The camera transmission gap correction method as described in item 4 of the scope of patent application, wherein the motor transmission value is expressed by the number of rotation steps of the step drive motor or the J voltage value of the voltage motor. 6 · The camera transmission gap correction method as described in item 5 of the scope of the patent application, wherein the reverse difference value, the forward cover difference value, or the correction difference value can be calculated using two steps of a step drive motor, or The amount of difference between the two voltage values Page 10 4 6 6: /, VI. Application scope of patent. Page 11