boost::gil支持10位图像吗

Does boost::gil support 10 bit images?

本文关键字：图像 10位 支持 gil boost      更新时间：2023-10-16

我正在尝试从缓冲区读取10位图像，并使用boost:：gil进行分析。我注意到存在一个rgb8_image_t类型，一个gray8_image_t类型，但找不到gray10_image_tt类型(这正是我所需要的(。这在吉尔存在吗？谢谢

编辑：使用这些类型时defs:

// reference type
typedef boost::gil::bit_aligned_pixel_reference<unsigned short, boost::mpl::vector1_c<unsigned, 10>, boost::gil::gray_layout_t, true> gray10_ref_t;
// iterator type
typedef boost::gil::bit_aligned_pixel_iterator<gray10_ref_t> gray10_ptr_t;
// pixel type
typedef std::iterator_traits<gray10_ptr_t>::value_type gray10_pixel_t;
// pixel storage to read, contains 3 10-bit gray pixels, all with value of 1 as per the following layout
// spaces show byte breaks, bars show pixel breaks, lsb first
// 10000000 00|100000 0000|1000 00000000
std::uint8_t data[4] = { 0x01, 0x04, 0x10, 0x00 };
// an iterator to the start of the storage
gray10_ptr_t p(&data[0], 0);
// check the expected pixel values
assert(p[0] == 0x01);
assert(p[1] == 0x01);
assert(p[2] == 0x01);

我在编译时得到以下错误：

untitled.cpp:17:6: error: ‘uint8_t’ in namespace ‘std’ does not name a type 
std::uint8_t data[4] = { 0x01, 0x04, 0x10, 0x00 };
^
untitled.cpp:20:17: error: ‘data’ was not declared in this scope
gray10_ptr_t p(&data[0], 0);
^
In file included from /usr/include/boost/predef/detail/_cassert.h:14:0,
from /usr/include/boost/predef/library/c/_prefix.h:11,
from /usr/include/boost/predef/library/c.h:11,
from /usr/include/boost/predef/library.h:11,
from /usr/include/boost/predef.h:14,
from /usr/include/boost/smart_ptr/detail/yield_k.hpp:28,
from /usr/include/boost/smart_ptr/detail/spinlock_sync.hpp:18,
from /usr/include/boost/smart_ptr/detail/spinlock.hpp:50,
from /usr/include/boost/smart_ptr/detail/spinlock_pool.hpp:25,
from /usr/include/boost/smart_ptr/shared_ptr.hpp:34,
from /usr/include/boost/shared_ptr.hpp:17,
from /usr/include/boost/gil/extension/io/io_error.hpp:23,
from /usr/include/boost/gil/extension/io/tiff_io.hpp:29,
from untitled.cpp:1:
untitled.cpp:23:13: error: expected ‘)’ before ‘==’ token
assert(p[0] == 0x01);
^
untitled.cpp:23:13: error: expected ‘)’ before ‘==’ token
untitled.cpp:24:13: error: expected ‘)’ before ‘==’ token
assert(p[1] == 0x01);
^
untitled.cpp:24:13: error: expected ‘)’ before ‘==’ token
untitled.cpp:25:13: error: expected ‘)’ before ‘==’ token
assert(p[2] == 0x01);
^
untitled.cpp:25:13: error: expected ‘)’ before ‘==’ token

有人知道如何修理这些吗？谢谢

没有，但您可以自己定义一个。

由于你的像素类型不是字节对齐的，你需要声明一个位对齐的像素和相关类型：

位对齐像素(和图像(比压缩像素更复杂。由于压缩像素是字节对齐的，我们可以使用C++引用作为压缩像素的引用类型，并使用C指针作为一行压缩像素上的x_迭代器。对于位对齐结构，我们需要一个特殊的引用代理类(bit_aligned_pixel_reference(和迭代器类(bit_aligned_pixel_iterator(。位对齐像素的值类型是packed_pixel。

一个工作示例：

#include <boost/gil.hpp>
#include <boost/mpl/vector.hpp>
#include <cstdint>
int main()
{
// reference type
using gray10_ref_t = boost::gil::bit_aligned_pixel_reference<unsigned short, boost::mpl::vector1_c<unsigned, 10>, boost::gil::gray_layout_t, true>;
// iterator type
using gray10_ptr_t = boost::gil::bit_aligned_pixel_iterator<gray10_ref_t>;
// pixel type
using gray10_pixel_t = std::iterator_traits<gray10_ptr_t>::value_type;
// pixel storage to read, contains 3 10-bit gray pixels, all with value of 1 as per the following layout
// spaces show byte breaks, bars show pixel breaks, lsb first
// 10000000 00|100000 0000|1000 00000000
std::uint8_t data[4] = { 0x01, 0x04, 0x10, 0x00 };
// an iterator to the start of the storage
gray10_ptr_t p(&data[0], 0);
// check the expected pixel values
assert(p[0] == 0x01);
assert(p[1] == 0x01);
assert(p[2] == 0x01);
}
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