*4.3. Information Type*

We have identified types of information provided to BLV to improve the accessibility of images (*RQ2*), which is shown in Table 2. The name of the object, mainly the object that is touched, was provided the most (*N* = 10), followed by spatial layout of various objects in each image (*N* = 8). As expected, types of provided information differ depending on the image type. For instance, direction/orientation, distance, and other geographic information was provided for map images. On the other hand, shape, size, boundary of objects, and length were mostly offered for images related to geometric figures. Scene descriptions (*N* = 5), textures (*N* = 4), graph values (*N* = 2), and texts written in images (*N* = 2) were also present. Note that only two papers supported color information for photographs [35] and artwork [66]. Other information types include types of graph [53] and weather [24]. Five papers did not specify the information they provided.


**Table 2.** Types of information provided to improve image accessibility.
