33results about How to "Amortized error" patented technology

A method and a device based on a uniform-speed moving point target for measuring transverse magnification of an optical system belongs to the field of measuring equipment characterized by optical methods. The method has the following steps: imaging for a point target is performed to obtain a linear image when the point target is in uniform motion; and the transverse magnification of the optical system of an image sensor can be calculated based on the fact that the theoretical cutoff frequency equals to the frequency corresponding to the first minimum of the modulation transfer function value obtained within the frequency domain through the practical measurement. A sliding block for bearing the point target in the device is installed on a first guiding rail and a second guiding rail; a controller is used for controlling the sliding block to move on the second guiding rail when the controller is used for controlling the sliding block to perform uniform motion on the first guiding rail, the movement in the two directions are matched, so that the point target can be always focused and imaged on the surface of the image sensor during the movement; and through adopting the method and the device for measuring the transverse magnification of the optical system, the error reduction of single measurement can be facilitated, so that the repeatability of measurement results can be improved.

A method and a device adopting a line source for measuring transverse magnification of an optical system belong to the field of measuring equipment characterized by optical methods. The method has the steps that a line source serves as a target to obtain a linear image; a value range of pixel pitch is obtained within the frequency domain; and the transverse magnification of the optical system can be calculated through the genetic algorithm and based on the fact that an actual modulation transfer function curve and a theoretic modulation transfer function curve related to the pixel pitch have the best contact ratio at the least squares. Within the plane defined by the optical axis direction of the device and the row direction or the line direction of an image sensor, the line source is curve, and the focusing and imaging on the surface of the image sensor at any position of the line source can be realized. Through adopting the method and the device for measuring the transverse magnification of the optical system, the error reduction of single measurement can be facilitated, so that the repeatability of measurement results can be improved.

The invention discloses a method and a device for measuring lateral magnification of an optical system, belonging to the metering equipment field taking optical method as characteristic, wherein the method comprises the steps of taking line light source as target to obtain a linear image; finding value range of the pixel distance in the frequency domain; using the search algorithm to perform computing to obtain lateral magnification of the optical system according to that the overlap ratio of the actual modulation transfer function curve related to the pixel distance and the theoretical actual modulation transfer function curve is the best on the least squares condition; and the line light source is a bent shape in a plane determined by the optical axis direction of the device and row or line direction of the image sensor; any position of the line light source can image focally to the surface of the image sensor. The method for measuring lateral magnification of an optical system in the invention is beneficial for reducing error between single measurement results so as to improve repeatability of the measurement result.

A method and a device for measuring the pixel pitch of an image sensor based on the point-target image splicing technology, which belong to the length, width or thickness metering field included in the field of metering equipment which is characterized by using an optical method. The method includes placing the point targets in different fields of view, and performing twice imaging of the point targets; constructing linear images according to the two point-target images; searching value ranges of the pixel pitch in the frequency domain, and calculating to obtain the pixel pitch by means of the search algorithm according to the best contact ratio of the actual modulation transfer function(MTF) curve related to the pixel pitch and the theoretical MTF curve related to the pixel pitch under the condition of the least square. Sliders bearing the point targets are arranged on a first guide rail and a second guide rail, and the movement of the slider on the first guide rail matches with the movement of the slider on the second guide rail so that the point targets can be focused correctly to form images on the surface of the image sensor at the position of any field of view. The method and the device for measuring the pixel pitch of the image sensor are favorable for reducing errors among results of single measurements, so that repetition of measuring results can be increased.

A method and a device for measuring transverse magnification of an optical system by means of point target image splicing belong to the field of metering equipment characterized by an optical method. The method includes: positioning point targets in different view fields and imaging the point targets twice; constructing a linear image according to two point target images; finding the value range of pixel spacing in a frequency domain; and calculating the transverse magnification of the optical system by means of genetic algorithm according to the fact that a practical modulation transfer function curve and a theoretic modulation transfer function curve related to the pixel spacing have the highest overlap ratio under the least square condition. In the device, sliders for bearing the point targets are mounted on a first guide rail and a second guide rail, and the movement of the sliders on the first guide rail is matched with that of the sliders on the second guide rail, so that the point targets are imaged on the surface of an image sensor at an optional position of a view field in a focused manner. By the aid of the method and the device for measuring the transverse magnification of the optical system, errors of single measuring results can be decreased, and further repeatability of measuring results is improved.

The invention relates to a method and a device for measuring the lateral magnification of an optical system based on joining of point target images, belonging to the field of metering equipment taking an optical method as a characteristic. The method is characterized in that a point target is in different fields of view and is imaged for twice, and a linear image is constructed according to two point target images; and in a frequency domain, by a principle that a frequency at which a modulation transfer function value obtained by actual measurement reaches a minimum value for the first time is equal to a theoretical cutoff frequency, the lateral magnification of the optical system is calculated. According to the device, a sliding block for bearing the point target is arranged on a first guide rail and a second guide rail, and the motion of the sliding block on the first guide rail is matched with the motion of the sliding block on the second guide rail, so that in any field of view, the point target can be accurately focused to be imaged onto the surface of an image sensor. According to the method and the device for measuring the lateral magnification of the optical system, the errors between single-time measurement results can be reduced, and further, the repeatability of measurement results can be improved.

A method and a device based on a uniform-speed moving point target for measuring transverse magnification of an optical system belongs to the field of measuring equipment characterized by optical methods. The method has the following steps: imaging for a point target is performed to obtain a linear image when the point target is in uniform motion; and the transverse magnification of the optical system of an image sensor can be calculated based on the fact that the theoretical cutoff frequency equals to the frequency corresponding to the first minimum of the modulation transfer function value obtained within the frequency domain through the practical measurement. A sliding block for bearing the point target in the device is installed on a first guiding rail and a second guiding rail; a controller is used for controlling the sliding block to move on the second guiding rail when the controller is used for controlling the sliding block to perform uniform motion on the first guiding rail, the movement in the two directions are matched, so that the point target can be always focused and imaged on the surface of the image sensor during the movement; and through adopting the method and the device for measuring the transverse magnification of the optical system, the error reduction of single measurement can be facilitated, so that the repeatability of measurement results can be improved.

The invention relates to a method and device for measuring the space of pixels of an image sensor by using a constant-speed movable point target, belonging to the field of the measurement of length, width or thickness by adopting the optical method. The method comprises the following steps: imaging the point target in the constant-speed movement state to obtain a linear image, and calculating the space of the pixels according to the characteristic that the frequency which is obtained through actual measurement when the modulation transfer function value reaches the minimum value for the first time is equal to the theoretical cutoff frequency in the frequency domain. The device is characterized in that a sliding block which bears the point target is arranged on a first guide rail and a second guide rail, when a controller controls the sliding block to move at constant speed on the first guide rail, the controller also controls the sliding block to move on the second guide rail, the movement in two directions matches with each other so that the point target is imaged on the surface of image sensor by calibrating the focus. Due to the adoption of the method and the device for measuring the space of pixels of the image sensor, the errors between the single-time measurement results can be reduced, and the repeatability of the measurement results can be improved accordingly.

A method and a device for measuring pixel pitch of an image sensor by utilizing a constant moving point target belong to the field of length, width or thickness measurement characterized by applying an optical method. The method for measuring the pixel pitch of the image sensor by utilizing the constant moving point target includes: acquiring a linear image by implementing an image formation when the point target constantly moves, searching for a value range of the pixel pitch in a frequency domain, and calculating to obtain the pixel pitch by utilizing a genetic algorithm according to the fact that an contact ratio between a practical modulation transfer function curve which is related to the pixel pitch and a theoretical modulation transfer function curve is the best under least squares conditions. Sliding blocks bearing the point target in the device for measuring the pixel pitch of the image sensor by utilizing constant moving point target is arranged on a first guide rail and a second guide rail, a controller controls the sliding block to uniformly move on the first guide rail while controlling the sliding block to move on the second guide rail, and the movements of the sliding blocks are matched with each other so that the point target is subjected to quasi focal imaging to the surface of the image sensor during motion . By adopting the method for measuring the pixel pitch of the image sensor by utilizing the constant moving point target, error among single measurement results can be reduced so that repeatability of the measurement results can be improved.

A point target image mosaic-based image sensor pixel pitch measurement method and a point target image mosaic-based image sensor pixel pitch measurement system belong to the field of length, width or thickness measurement in the field of measuring equipment characterized by the optical method. The method includes the following steps: a point target is located in different fields of view and imaged for two times, a linear image is constructed according to the two point target images, the frequency corresponding to the first minimum of a modulation transfer function value obtained by utilizing actual measurement is equal to the theoretical cutoff frequency within a frequency domain, and the pixel pitch of an image sensor is worked out. In the system, a slider carrying the point target is mounted on a first track and a second track, and the motion of the slider on the first track cooperates with the motion of the slider on the second track, so that the point target can be focused and imaged onto the surface of the image sensor at any position in the field of views. The adoption of the invention in the measurement of the pixel pitch of the image sensor can help to reduce the error between single measurement results, thus increasing the repeatability of the measurement results.

A method and a device for measuring pixel pitch of an image sensor on the basis of a line light source belong to the field of length, or width or thickness metering of the metering equipment field which is characterized by utilizing an optical method. The method for measuring the pixel pitch of the image sensor on the basis of the line light source includes that a linear image is obtained by targeting the line light source, the pixel pitch of the image sensor is acquired by calculating by using the equality of a practically- measured frequency when the modulation transfer function value reaches the minimum value for the first time with a theoretical cutoff frequency in a frequency domain. The device for measuring the pixel pitch of the image sensor on the basis of the line light source is located in the plane determined by an optical axis direction and a row direction or a line direction of the image sensor, the line light source is curved, any part of the line light source can be subjected to quasi focal imaging to the surface of the image sensor. By adopting the method and the device for measuring the pixel pitch of the image sensor on the basis of line light source, errors among results of a single measurement can be reduced so that repeatability of the measurement results can be improved.

The invention relates to a method and a device for measuring optical system lateral magnification by utilizing uniform-speed moving point target, belonging to the field of metering equipment taking an optical method as a characteristic. In the method, a points target is imaged under the uniform-speed motion state, so that a linear image is obtained; and in a frequency domain, a value range of pitch of pixels is found, and because the actual modification transfer function curve relative to a pixel pitch and a theoretical modification transfer function curve have the best contact ratio under the least square condition, and the optical system lateral magnification is calculated by a search algorithm to be obtained. In the device, a sliding block for bearing the point target is arranged on first rails and second rails, a controller controls the sliding block to do uniform-speed motion on the first rails, and at the same time, controls the sliding block to do motion on the second rails, and the motions in the two directions are matched, so that during the motion process, the point target is always focused to be imaged onto the surface of an image senor. By adopting the method and the device to measure the optical system lateral magnification rate, the errors between single-time measurement results can be reduced, and further, the repeatability of the measurement results can be improved.

The invention relates to a seed grain length measuring device. The device comprises a fixing shaft, a seed winding cylinder, a bottom support, a top support and a sample pushing stick, the seed winding cylinder comprises a first inner side winding shaft arranged on the inner edge, a shaft sleeve is arranged on the first inner side winding shaft, the seed winding cylinder is axially arranged on the fixing shaft in a sleeved mode through the shaft sleeve, a first fixing clamp is arranged on the shaft sleeve, a second fixing clamp is arranged on the bottom support, the winding cylinder performs coating and winding on to-be-tested seeds along the first inner side winding shaft, the upper end of the winding cylinder is fixed through the first fixing clamp on the shaft sleeve, and the lower end of the winding cylinder is fixed through the second fixing clamp on the bottom support. The internal diameter of the seed winding cylinder is adjusted according to the size of the grain diameter of the seeds, the role in axially fixing the seeds is achieved, and the device is suitable for measuring the grain length of the seeds of different forms and sizes, operation is convenient and rapid, the structure is simple, and the work efficiency and the precision of seed grain length measuring are effectively improved.

A method and a device for measuring pixel pitch of an image sensor by utilizing a line light source belong to a field of calculating a length, a width or a thickness in a measuring equipment field which is characterized by applying optical method. The method for measuring the pixel pitch of the image sensor by utilizing line light source is characterized in that a linear image is acquired by targeting the line light source, a value range of the pixel pitch is searched in a frequency domain, the pixel pitch of the image sensor is acquired by calculating on the basis of utilizing a search algorithm in case that the contact ratio between a practical modulation transfer function curve which is related to the pixel pitch and a theoretical modulation transfer function curve is the best under least squares conditions. The device for measuring the pixel pitch of the image sensor by utilizing line light source is located in the plane determined by an optical axis direction and a row direction or a column direction of the image sensor, the line light source is of forniciform, any part of the line light source can be subjected to quasi focal imaging to the surface of the image sensor. By adopting the method for measuring the pixel pitch of the image sensor by utilizing line light source, error between single measurement results can be reduced to improve repeatability of the measurement results.

The invention relates to a method and device for measuring the space of pixels of an image sensor by using a constant-speed movable point target, belonging to the field of the measurement of length, width or thickness by adopting the optical method. The method comprises the following steps: imaging the point target in the constant-speed movement state to obtain a linear image, searching the value taking range of the space of the pixels in the frequency domain, and calculating the space of the pixels by using the search algorithm according to the characteristic that the actual modulation transfer function curve and the theoretical modulation transfer function curve which are relevant to the space of the pixels can coincide best under the least square condition. The device is characterized in that a sliding block which bears the point target is arranged on a first guide rail and a second guide rail, when a controller controls the sliding block to move at constant speed on the first guide rail, the controller also controls the sliding block to move on the second guide rail, the movement in two directions matches with each other so that the point target is imaged on the surface of image sensor by calibrating the focus. Due to the adoption of the method and the device for measuring the space of pixels of the image sensor, the errors between the single-time measurement results can be reduced, and the repeatability of the measurement results can be improved accordingly.

The invention discloses a method and a device for measuring the transverse magnifying power of an optical system based on a linear source, which belong to the field of metering equipment which is characterized by the adoption of an optical method. In the method, a linear image is obtained by taking the linear source as a target, and the transverse magnifying power of the optical system is calculated since a frequency which corresponds to a moment when a practically-measured modulation transfer function value reaches a minimum value for the first time in a frequency domain is equal to a theoretical cutoff frequency. In the device, the linear source is bent in a plane which is defined by the optical axis direction of the device and the line or raw direction of the image sensor, and any position on the linear source is focused and imaged on the surface of an image sensor. Due to the adoption of the method and the device for measuring the transverse magnifying power of the optical system, reduction in errors among single measuring results is facilitated, and the repetitiveness of the measuring results is enhanced.

The invention provides a lateral magnification measuring method for a point target image-spliced optical system and a lateral magnification measuring device, belonging to the field of metering equipment which takes an optical method as the characteristic. According to the method, a point target is under different view fields and is imaged twice, a linear image is formed according to two point target images, the dereferencing range of a pixel distance is searched in a frequency domain, and according to the condition that a practical modulation transfer function curve and a theoretical modulation transfer function curve, which are related with the pixel distance, the contact ratio is best in the case of least squares, the lateral magnification of the optical system is computed by a search algorithm; a slide block carried with a point target in the device is arranged on a first guide rail and a second guide rail, and the motion of the slide block on the first guide rail and the motion of the slide block on the second guide rail are matched with each other, so that the point target is exactly focused and imaged to the surface of an image sensor at any view filed position; and the lateral magnification of the optical system is measured by the invention, so that the error among single-measurement results can be preferably reduced, and the repeatability of the measurement results can be further improved.