The focal length is conventionally represented in pixels. For a detailed explanation, please seehttps://ksimek.github.io/2013/08/13/intrinsic. Pixels-to-meters conversion can use SENSOR_INFO_PHYSICAL_SIZE and SENSOR_INFO_PIXEL_ARRAY_SIZE in the Android Camera Characteristics API.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-14 UTC."],[[["\u003cp\u003e\u003ccode\u003eArCameraIntrinsics\u003c/code\u003e provides access to the physical characteristics of the device camera, such as focal length, image dimensions, and principal point.\u003c/p\u003e\n"],["\u003cp\u003eYou can create and release \u003ccode\u003eArCameraIntrinsics\u003c/code\u003e objects using dedicated functions like \u003ccode\u003eArCameraIntrinsics_create\u003c/code\u003e and \u003ccode\u003eArCameraIntrinsics_destroy\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eFunctions are available to retrieve specific camera properties, including focal length (\u003ccode\u003eArCameraIntrinsics_getFocalLength\u003c/code\u003e), image dimensions (\u003ccode\u003eArCameraIntrinsics_getImageDimensions\u003c/code\u003e), and principal point (\u003ccode\u003eArCameraIntrinsics_getPrincipalPoint\u003c/code\u003e).\u003c/p\u003e\n"],["\u003cp\u003eFocal length is represented in pixels and can be converted to meters using Android Camera Characteristics API parameters.\u003c/p\u003e\n"]]],[],null,["# ArCameraIntrinsics\n==================\n\nProvides information about the physical characteristics of the device camera.\n\nSummary\n-------\n\n| ### Typedefs ||\n|-------------------------------------------|--------------------------------------------------------------------------------------|\n| [ArCameraIntrinsics](#arcameraintrinsics) | typedef `struct ArCameraIntrinsics_` The physical characteristics of a given camera. |\n\n| ### Functions ||\n|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------|\n| [ArCameraIntrinsics_create](#arcameraintrinsics_create)`(const `[ArSession](/ar/reference/c/group/ar-session#arsession)` *session, `[ArCameraIntrinsics](/ar/reference/c/group/ar-camera-intrinsics#arcameraintrinsics)` **out_camera_intrinsics)` | `void` Allocates a camera intrinstics object. |\n| [ArCameraIntrinsics_destroy](#arcameraintrinsics_destroy)`(`[ArCameraIntrinsics](/ar/reference/c/group/ar-camera-intrinsics#arcameraintrinsics)` *camera_intrinsics)` | `void` Releases the provided camera intrinsics object. |\n| [ArCameraIntrinsics_getFocalLength](#arcameraintrinsics_getfocallength)`(const `[ArSession](/ar/reference/c/group/ar-session#arsession)` *session, const `[ArCameraIntrinsics](/ar/reference/c/group/ar-camera-intrinsics#arcameraintrinsics)` *intrinsics, float *out_fx, float *out_fy)` | `void` Returns the camera's focal length in pixels. |\n| [ArCameraIntrinsics_getImageDimensions](#arcameraintrinsics_getimagedimensions)`(const `[ArSession](/ar/reference/c/group/ar-session#arsession)` *session, const `[ArCameraIntrinsics](/ar/reference/c/group/ar-camera-intrinsics#arcameraintrinsics)` *intrinsics, int32_t *out_width, int32_t *out_height)` | `void` Returns the image's width and height in pixels. |\n| [ArCameraIntrinsics_getPrincipalPoint](#arcameraintrinsics_getprincipalpoint)`(const `[ArSession](/ar/reference/c/group/ar-session#arsession)` *session, const `[ArCameraIntrinsics](/ar/reference/c/group/ar-camera-intrinsics#arcameraintrinsics)` *intrinsics, float *out_cx, float *out_cy)` | `void` Returns the principal point in pixels. |\n\nTypedefs\n--------\n\n### ArCameraIntrinsics\n\n```scdoc\nstruct ArCameraIntrinsics_ ArCameraIntrinsics\n``` \nThe physical characteristics of a given camera.\n\n\n- Allocate with: [ArCameraIntrinsics_create](/ar/reference/c/group/ar-camera-intrinsics#arcameraintrinsics_create)\n- Release with: [ArCameraIntrinsics_destroy](/ar/reference/c/group/ar-camera-intrinsics#arcameraintrinsics_destroy)\n\n\u003cbr /\u003e\n\nFunctions\n---------\n\n### ArCameraIntrinsics_create\n\n```gdscript\nvoid ArCameraIntrinsics_create(\n const ArSession *session,\n ArCameraIntrinsics **out_camera_intrinsics\n)\n``` \nAllocates a camera intrinstics object.\n\n\n| Details ||\n|------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| Parameters | |-------------------------|-----------------------------------------------------------------------------------------------| | `session` | The ARCore session | | `out_camera_intrinsics` | The [ArCameraIntrinsics](/ar/reference/c/group/ar-camera-intrinsics#arcameraintrinsics) data. | |\n\n### ArCameraIntrinsics_destroy\n\n```povray\nvoid ArCameraIntrinsics_destroy(\n ArCameraIntrinsics *camera_intrinsics\n)\n``` \nReleases the provided camera intrinsics object. \n\n### ArCameraIntrinsics_getFocalLength\n\n```gdscript\nvoid ArCameraIntrinsics_getFocalLength(\n const ArSession *session,\n const ArCameraIntrinsics *intrinsics,\n float *out_fx,\n float *out_fy\n)\n``` \nReturns the camera's focal length in pixels.\n\nThe focal length is conventionally represented in pixels. For a detailed explanation, please see \u003chttps://ksimek.github.io/2013/08/13/intrinsic\u003e. Pixels-to-meters conversion can use SENSOR_INFO_PHYSICAL_SIZE and SENSOR_INFO_PIXEL_ARRAY_SIZE in the Android Camera Characteristics API. \n\n### ArCameraIntrinsics_getImageDimensions\n\n```gdscript\nvoid ArCameraIntrinsics_getImageDimensions(\n const ArSession *session,\n const ArCameraIntrinsics *intrinsics,\n int32_t *out_width,\n int32_t *out_height\n)\n``` \nReturns the image's width and height in pixels. \n\n### ArCameraIntrinsics_getPrincipalPoint\n\n```gdscript\nvoid ArCameraIntrinsics_getPrincipalPoint(\n const ArSession *session,\n const ArCameraIntrinsics *intrinsics,\n float *out_cx,\n float *out_cy\n)\n``` \nReturns the principal point in pixels."]]
