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task library
built templatecctv-designwith-tool

Ppm Calculation

Calculates CCTV pixel density at a target distance using horizontal camera resolution, sensor width, and lens focal length. The reduced pinhole-camera method estimates horizontal field of view, pixels per metre, and margin against a specified surveillance target density.

inputs

5 fields

context

3 archetypes

engine

with-tool

outputs

3 scored fields

contract fields

Parameter Map

5 inputs to 3 scored outputs

  • horizontal_pixels

    float

    Horizontal camera resolution

    640 to 12000px

  • sensor_width_mm

    float

    Camera sensor width

    2 to 25mm

  • lens_focal_length_mm

    float

    Lens focal length

    2 to 80mm

  • target_distance_m

    float

    Distance from camera to target plane

    1 to 200m

  • target_ppm

    floathidden in hard

    Required pixel density target

    20 to 1000px/m
horizontal_field_of_view_mtol 0.03

Horizontal field of view at the target plane

pixels_per_metertol 0.03

Pixel density at target distance

target_ppm_margin_pcttol 0.03

Margin relative to target pixel density

visibility contract

Difficulty Ladder

all_giveneasy

Detection or recognition camera with all geometry given

all fields visible
all_givenmedium

Mixed camera objectives and target densities

all fields visible
partialhard

Target PPM hidden in the surveillance objective

target_ppm

scenario bands

Archetype Atlas

detection_camera

2 contexts

Wide-angle detection camera

horizontal_pixels1280 to 3840
sensor_width_mm4 to 8
lens_focal_length_mm2.8 to 6
target_distance_m10 to 80

car-park / site-perimeter

recognition_camera

2 contexts

Recognition camera at an access point

horizontal_pixels1920 to 8000
sensor_width_mm4 to 12
lens_focal_length_mm6 to 25
target_distance_m5 to 50

building-entry / station-gate

identification_camera

2 contexts

High-density identification camera

horizontal_pixels3840 to 12000
sensor_width_mm6 to 25
lens_focal_length_mm12 to 80
target_distance_m3 to 30

cash-office / secure-room

rendered task

Generation Preview

building-entry-recognition-camera-preview

difficulty
hard
visibility
partial
archetype
recognition_camera
site context
building-entry
instruction excerptppm-calculation_calc.py

visible fields

  • horizontal_pixels1920 to 8000 px
  • sensor_width_mm4 to 12 mm
  • lens_focal_length_mm6 to 25 mm
  • target_distance_m5 to 50 m

withheld schema

target_ppmhorizontal_field_of_view_mpixels_per_metertarget_ppm_margin_pct
Recognition camera at an access point. building-entry. Required outputs: horizontal_field_of_view_m, pixels_per_meter, target_ppm_margin_pct