A reach and placement tool includes an eyepiece, an orientation sensor, a distance sensor, and a controller. The controller is configured to obtain a distance value and an orientation from the distance sensor and the orientation sensor when the reach and placement tool is directed towards a point of interest at a particular location. The controller is also configured to determine a coordinate of the point of interest using the distance value and the orientation, and compare the coordinate of the point of interest to a reach envelope to determine if the point of interest is within range of a particular reach apparatus.

The invention relates to a rangefinder for a telescope having a transmitter and a transmission beam path and having a first receiver and a first receiver beam path, wherein the first receiver beam path extends at least partially in a first observation beam path of the telescope. The rangefinder additionally comprises a second receiver with a second receiver beam path which is aligned in parallel to the first transmission beam path, and which is arranged at a distance from the first observation beam path of the telescope.

The present disclosure provides a method and an apparatus for binocular ranging, capable of achieving an improved accuracy of binocular ranging. The method includes: extracting features from a left image and a right image to obtain a left feature image and a right feature image; selecting a standard feature image and obtaining a cost volume of the standard feature image by applying a correlation calculation to the left feature image and the right feature image using a block matching algorithm; obtaining a confidence volume by normalizing computational costs of all disparity values in a disparity dimension for each pixel point in the cost volume; obtaining a confidence map by selecting a maximum value from confidence levels of all the disparity values in the disparity dimension for each pixel point in the confidence volume; obtaining a mask map by mapping each pixel point having a confidence level higher than a predetermined threshold in the confidence map to 1 and mapping each pixel point having a confidence level lower than or equal to the threshold in the confidence map to 0; obtaining a disparity map by calculating an argmax value for the confidence levels of all disparity values in the disparity dimension for each pixel point in the confidence volume; obtaining a target disparity map by multiplying the mask map with the disparity map; and estimating a distance based on the target disparity map.

The present disclosure provides a method and an apparatus for binocular ranging, capable of achieving an improved accuracy of binocular ranging. The method includes: extracting features from a left image and a right image to obtain a left feature image and a right feature image; selecting a standard feature image and obtaining a cost volume of the standard feature image by applying a correlation calculation to the left feature image and the right feature image using a block matching algorithm; obtaining a confidence volume by normalizing computational costs of all disparity values in a disparity dimension for each pixel point in the cost volume; obtaining a confidence map by selecting a maximum value from confidence levels of all the disparity values in the disparity dimension for each pixel point in the confidence volume; obtaining a mask map by mapping each pixel point having a confidence level higher than a predetermined threshold in the confidence map to 1 and mapping each pixel point having a confidence level lower than or equal to the threshold in the confidence map to 0; obtaining a disparity map by calculating an argmax value for the confidence levels of all disparity values in the disparity dimension for each pixel point in the confidence volume; obtaining a target disparity map by multiplying the mask map with the disparity map; and estimating a distance based on the target disparity map.

An elevation range meter is configured to be used in conjunction with a reticle to provide an offset range marking, such as an offset range distance that a target is located over on the reticle before firing. An offset range distance factors in the range to the target and the elevation of the firearm. The elevation range meter has a weighted dial that rotates with respect to the barrel or elevation angle to indicate an offset range marking, such as a distance, milliradians or minutes of angle, from a plurality of elevation range marking columns on the weighted dial. The weighted dial may have a plurality of columns of elevation range markings and the appropriate column for the determined range may be selected to indicate the offset range distance. The user may then locate the target on the reticle at this offset range distance before firing.

A multi-distance ranging reticle for an optical device is provided. The reticle can include a primary vertical crosshair transverse to a primary horizontal crosshair, a secondary horizontal crosshair having a first vertical marking and a second vertical marking, separated by a distance, the secondary horizontal crosshair corresponding to a first range. A first object having a first known width can be placed between the first and second vertical markings to estimate a first estimated range to the first object. An assortment of other vertical markings can be disposed along the secondary horizontal cross hair, and/or other additional horizontal crosshairs and separated by other distances corresponding to other known widths of other objects. By selectively framing an object of a known width between certain vertical markings along a particular horizontal crosshair, a user can quickly and efficiently estimate range of the object. A related method of use is provided.

A multi-distance ranging reticle for an optical device is provided. The reticle can include a primary vertical crosshair transverse to a primary horizontal crosshair, a secondary horizontal crosshair having a first vertical marking and a second vertical marking, separated by a distance, the secondary horizontal crosshair corresponding to a first range. A first object having a first known width can be placed between the first and second vertical markings to estimate a first estimated range to the first object. An assortment of other vertical markings can be disposed along the secondary horizontal cross hair, and/or other additional horizontal crosshairs and separated by other distances corresponding to other known widths of other objects. By selectively framing an object of a known width between certain vertical markings along a particular horizontal crosshair, a user can quickly and efficiently estimate range of the object. A related method of use is provided.

A digital counting and display system and methods for use with a laser rangefinder that counts backscattered laser beams and displays a distance between a laser and a target. The laser rangefinder includes a laser configured to emit a pulsed laser beam, an afocal Gallilean telescope configured to receive backscattered laser pulses and generate a series of focused backscattered laser pulses, a silicon avalanche photodetector connected to the afocal Gallilean telescope, configured to generate a series of currents signal proportional to the series of focused backscattered laser pulses, a low noise, multistage amplifier connected to the silicon avalanche photodetector, configured to generate a series of linearly changing amplified voltage signals from the series of current signals, an analog-to-digital converter configured to convert the series of linearly changing amplified voltage signals to a series of digital voltage signals, and a digital counting and display circuit connected to the analog-digital converter.

A digital counting and display system and methods for use with a laser rangefinder that counts backscattered laser beams and displays a distance between a laser and a target. The laser rangefinder includes a laser configured to emit a pulsed laser beam, an afocal Gallilean telescope configured to receive backscattered laser pulses and generate a series of focused backscattered laser pulses, a silicon avalanche photodetector connected to the afocal Gallilean telescope, configured to generate a series of currents signal proportional to the series of focused backscattered laser pulses, a low noise, multistage amplifier connected to the silicon avalanche photodetector, configured to generate a series of linearly changing amplified voltage signals from the series of current signals, an analog-to-digital converter configured to convert the series of linearly changing amplified voltage signals to a series of digital voltage signals, and a digital counting and display circuit connected to the analog-digital converter.

The present invention discloses a composite prism based on an isosceles prism and a laser ranging telescope comprising the composite prism. The composite prism disclosed by the present invention comprises a first prism, a second prism, a third prism and a compensating prism. The first prism is an isosceles prism with three reflecting surfaces, the second prism is a roof prism, the third prism is a half-penta prism, and the compensating prism is a wedge prism. Through the composite prism, a telescope observation system, a laser emission system, a laser receiving system and a sighting and display system are reasonably integrated, so that a telescope features diversified performance and structural style, small size and convenient to carry.