如何将内存映像分配给DLIB array2d或映像? [英] How to assign memory images to a DLIB array2d or image?

问题描述

这可能更多是c ++问题，但确实与DLIB有关.我正在使用另一个库将图像加载到内存中(Leadtools).我想用赋值替换"load_image"函数，但是我很难弄清楚该怎么做.我已经从负载中分配了我需要分配的所有信息和内存，例如像素位深度，宽度，高度，width_step，rgb/bgr顺序以及指向数据的指针.

This is likely more of a c++ question, but it does relate to DLIB. I am using another library to load images into memory (Leadtools). I want to replace the "load_image" function with assignments, but I am having trouble figuring out how to do so. I have all the information and memory allocated I need from my load, such as pixel bit depth, width, height, width_step, rgb/bgr order, and a pointer to the data.

因此在示例中，有:

array2d<bgr_pixel> img;

我可以这样做:

img.set_size(mywidth, myheight);

但是(假设数据mypointer是bgr连续char *字节):

But (assuming the data mypointer is bgr contiguous char * bytes):

img.data = mydatapointer;  

不起作用-没有img.data，而且我不知道如何使用image_view.

does not work - there is no img.data, plus I can't figure out how to use image_view.

设置该数据指针的正确方法是什么?请注意，我不想复制内存:-)

What is the right way to setup that data pointer? Note that I do NOT want to duplicate memory :-)

为了模拟load_image并在dlib中使用正确的结构，还有其他需要设置的东西吗?

Is there anything else that needs setting in order to simulate the load_image and have the correct structure to use within dlib?

TIA

推荐答案

基于戴维斯·金(Davis King)的评论.

Based on Davis King's comment.

为避免将数据从您自己的图像结构复制到dlib内部格式，dlib允许您实现一个通用的图像接口，该接口将允许dlib直接使用您的图像.需要实现的接口如下:

To avoid copying data from your own image structure to dlib internal format, dlib allows you to implement a generic image interface that will allows dlib to use directly your image. The interface that needs to be implemented looks like this:

    In dlib, an "image" is any object that implements the generic image interface.  In
    particular, this simply means that an image type (let's refer to it as image_type
    from here on) has the following seven global functions defined for it:
        - long        num_rows      (const image_type& img)
        - long        num_columns   (const image_type& img)
        - void        set_image_size(      image_type& img, long rows, long cols)
        - void*       image_data    (      image_type& img)
        - const void* image_data    (const image_type& img)
        - long        width_step    (const image_type& img)
        - void        swap          (      image_type& a, image_type& b)
     And also provides a specialization of the image_traits template that looks like:
        namespace dlib
        {
            template <> 
            struct image_traits<image_type>
            {
                typedef the_type_of_pixel_used_in_image_type pixel_type;
            };
        }

您可以在此处找到更多详细信息: http://dlib.net/dlib/image_processing/generic_image.h.html

You can find more details here: http://dlib.net/dlib/image_processing/generic_image.h.html

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