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Merge pull request #26551 from Kumataro:fix26550

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doc: update introduction for new MatDepth(5.x)
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Alexander Smorkalov 2024-12-02 14:01:15 +03:00 committed by GitHub
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@ -220,32 +220,52 @@ version the use of templates is limited.
Consequently, there is a limited fixed set of primitive data types the library can operate on. That
is, array elements should have one of the following types:
- 8-bit unsigned integer (uchar)
- 8-bit signed integer (schar)
- 16-bit unsigned integer (ushort)
- 16-bit signed integer (short)
- 32-bit signed integer (int)
- 32-bit floating-point number (float)
- 64-bit floating-point number (double)
- 8-bit unsigned integer (uint8_t, uchar)
- 8-bit signed integer (int8_t, schar)
- 16-bit unsigned integer (uint16_t, ushort)
- 16-bit signed integer (int16_t, short)
- 32-bit unsigned integer (uint32_t, unsigned) *1
- 32-bit signed integer (int32_t, int)
- 64-bit unsigned integer (uint64_t, unsigned long) *1
- 64-bit signed integer (int64_t, long) *1
- 16-bit brain floating point number / bfloat16 (bfloat) *1
- 16-bit half precision floating-point / hfloat16 (hfloat)
- 32-bit single precision floating-point number (float)
- 64-bit double precision floating-point number (double)
- Boolean (boolean) *1
- a tuple of several elements where all elements have the same type (one of the above). An array
whose elements are such tuples, are called multi-channel arrays, as opposite to the
single-channel arrays, whose elements are scalar values. The maximum possible number of
channels is defined by the #CV_CN_MAX constant, which is currently set to 512.
channels is defined by the #CV_CN_MAX constant, which is currently set to 128.
For these basic types, the following enumeration is applied:
@note *1) Supported from OpenCV5.
For these basic types, the following definition is applied:
```.cpp
enum { CV_8U=0, CV_8S=1, CV_16U=2, CV_16S=3, CV_32S=4, CV_32F=5, CV_64F=6 };
#define CV_8U 0
#define CV_8S 1
#define CV_16U 2
#define CV_16S 3
#define CV_32S 4
#define CV_32F 5
#define CV_64F 6
#define CV_16F 7
#define CV_16BF 8
#define CV_Bool 9
#define CV_64U 10
#define CV_64S 11
#define CV_32U 12
```
Multi-channel (n-channel) types can be specified using the following options:
- #CV_8UC1 ... #CV_64FC4 constants (for a number of channels from 1 to 4)
- CV_8UC(n) ... CV_64FC(n) or CV_MAKETYPE(CV_8U, n) ... CV_MAKETYPE(CV_64F, n) macros when
- #CV_8UC1 ... #CV_32UC4 constants (for a number of channels from 1 to 4)
- CV_8UC(n) ... CV_32UC(n) or CV_MAKETYPE(CV_8U, n) ... CV_MAKETYPE(CV_32U, n) macros when
the number of channels is more than 4 or unknown at the compilation time.
@note `#CV_32FC1 == #CV_32F, #CV_32FC2 == #CV_32FC(2) == #CV_MAKETYPE(CV_32F, 2)`, and
`#CV_MAKETYPE(depth, n) == ((depth&7) + ((n-1)<<3)`. This means that the constant type is formed from the
depth, taking the lowest 3 bits, and the number of channels minus 1, taking the next
`log2(CV_CN_MAX)` bits.
`#CV_MAKETYPE(depth, n) == (CV_MAT_DEPTH(depth) + (((cn)-1) << CV_CN_SHIFT))`. This means that
the constant type is formed from the depth, taking the lowest CV_CN_SHIFT bits, which is currently set to 5,
and the number of channels minus 1, taking the next `log2(CV_CN_MAX)` bits.
Examples:
```.cpp