Camera and projectile detector systems and devices for ballistic parameter measurements of a projectile in a target volume

A ballistic detection system comprising:

• a projectile detector;
• electromagnetic radiation detection equipment communicatively coupled with the projectile detector, the electromagnetic radiation detection equipment comprising
• a first camera arranged with respect to a target volume to view the target volume from a first perspective defined by a first position and a first orientation of the first camera, and
• a second camera arranged with respect to the target volume to view the target volume from a second perspective, the second perspective defined by a second position and a second orientation of the second camera;
• and
• a ballistics analysis computer communicatively coupled with the electromagnetic radiation detection equipment, wherein the ballistics analysis computer is configured to
• obtain image data captured by the first and second cameras in accordance with timing specified by the projectile detector,
• determine at least two points in three-dimensional space using intrinsic and extrinsic parameters of the first and second cameras by being configured to
• identify image artifacts of a projectile in the image data including a stripe in each of a first set of one or more images from the first camera and a second set of one or more images from the second camera, wherein the intrinsic parameters of the first camera characterize transformation between image plane coordinates and pixel coordinates for the first camera, the intrinsic parameters of the second camera characterize transformation between image plane coordinates and pixel coordinates for the second camera, and the extrinsic parameters of the first and second cameras relate the first perspective and the second perspective to each other,
• transform the stripe in the first set of one or more images into a line in the image plane of the first camera using the intrinsic parameters of the first camera,
• convert the line in the image plane of the first camera into a first plane,
• transform the stripe in the second set of one or more images into a line in the image plane of the second camera using the intrinsic parameters of the second camera,
• convert the line in the image plane of the second camera into a second plane, and
• intersect the first plane and the second plane to form a line in three-dimensional space that includes the at least two points;
• and
• define a trajectory of the projectile within the target volume using the at least two points in three-dimensional space by being configured to
• define a direction of the projectile as coincident with the line in three-dimensional space, and
• define a speed of the projectile using the image data, radar data, or both.

A ballistic detection system comprising:

• a projectile detector;
• electromagnetic radiation detection equipment communicatively coupled with the projectile detector, wherein the electromagnetic radiation detection equipment comprises
• a first camera arranged with respect to a target volume to view the target volume from a first perspective defined by a first position and a first orientation of the first camera,
• a second camera arranged with respect to the target volume to view the target volume from a second perspective, the second perspective defined by a second position and a second orientation of the second camera,
• a lighting system comprising one or more light emitters configured and arranged to illuminate the target volume with light having a first bandwidth straddling a first wavelength, and
• a passband filter between the target volume and an image sensor of each of the first and second cameras, wherein the passband filter has a second bandwidth straddling a second wavelength, the second wavelength is included in the first bandwidth straddling the first wavelength, and the second bandwidth is smaller than first bandwidth;
• a ballistics analysis computer communicatively coupled with the electromagnetic radiation detection equipment, wherein the ballistics analysis computer is configured to
• obtain image data captured by the first and second cameras in accordance with timing specified by the projectile detector,
• determine at least two points in three-dimensional space using intrinsic and extrinsic parameters of the first and second cameras, wherein the at least two points in three-dimensional space correspond to image artifacts of a projectile detected in the image data, the intrinsic parameters of the first camera characterize transformation between image plane coordinates and pixel coordinates for the first camera, the intrinsic parameters of the second camera characterize transformation between image plane coordinates and pixel coordinates for the second camera, and the extrinsic parameters of the first and second cameras relate the first perspective and the second perspective to each other,
• define a trajectory of the projectile within the target volume using the at least two points in three-dimensional space, and
• find a point of intersection of the trajectory of the projectile with an object associated with the target volume.