A **bit plane** refers to a specific representation of the bits in the binary encoding of pixel values in an image. In digital image processing, each pixel of an image can be represented by several bits, depending on the color depth (e.g., grayscale, RGB, etc.). ### Understanding Bit Planes: 1. **Binary Representation**: Each pixel can be thought of as a binary number.
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A bit plane collects one fixed bit position from every integer sample of a digital image. For an unsigned -bit sample , define its plane- entry byEach bit plane contains binary entries, while the powers of two determine their contribution to reconstruction. The Linux frame-buffer API uses this organization for
FB_TYPE_PLANES, where plane stores bit of the pixel samples.[ref]The Frame Buffer Device API in the Linux Kernel documentation. §2, FB_TYPE_PLANES and FB_TYPE_INTERLEAVED_PLANES
For an original four-pixel row stored as four-bit unsigned samples, the bit planes from most significant to least significant areThe third pixel reconstructs as . The same operation applies independently to every location in an image; bit-plane slicing extracts those binary images for inspection or processing.
If only the two most significant bit planes are retained, this row reconstructs as . In general that truncation gives , so the discarded remainder lies between zero and three. This is a statement about integer code values; a nonlinear color space can make equal code changes correspond to unequal light changes.
A bit plane differs from a component plane. One eight-bit red component plane can itself be decomposed into eight bit planes. State the component encoding, bit significance and layout before combining planes; the visible binary pattern alone does not identify its significance. Bit planes need not form a progression from smooth shapes to noise for arbitrary images.