The requirements for cameras when you work with the Heat map detection module are given in the following table.
Camera | - Resolution: 720x576 pixels (CIF4); the use of 360x288 pixels (CIF1) is acceptable; oversize images are reduced to CIF4.
- Fps: at least six.
- Color: analytics works with both grey and color images.
- Camera shaking is absent
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Lighting | - The best detector operation is achieved at medium lighting. In conditions of insufficient (night) or excessive (light-striking) lighting, the quality of algorithm operation can be reduced.
- Sharp lighting changes can lead to the short-time improper analytics operation
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Scene and camera angle | - The best position—a camera "looks" at the scene vertically down. The better you perform this requirement, the more accurate the received estimation.
- Sizes of the camera field of view: 3x3 m is minimal (6x6 people), 4x4 m is optimal (8x8 people), and 8x8 m is maximal (16x16 people).
- Background is static and isn't changed sharply.
- Analytics can work improperly on reflecting surfaces and in the case of sharp shadows from moving objects.
- Analytics can work improperly if there are periodic movements of background objects (trees, working TV, and so on) in the camera field of view
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Object images | - Image quality: the image must be clear, without visible defects from the compression algorithm.
- Permissible person size (the area of a rectangular track around a person) as a percentage of the frame area: from 0.25% to 10%
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