Am I right to read a lua table as argument from C function?

Am I right to read a lua table as argument from C function?

I'm going to implement a function with C language and which will be called
by Lua script.
This function should receive a lua table as the argument, so I should read
the fields in the table.I try to do like blow, does anyone can help me
check my code? Is the way I use on right?

/*
function findImage(options)
imagePath = options.imagePath
fuzzy = options.fuzzy
ignoreColor = options.ignoreColor;
end
Call Example:
findImage {imagePath="/var/image.png", fuzzy=0.5, ignoreColor=0xffffff}
*/
// implement the function by C language
static int findImgProxy(lua_State *L)
{
luaL_checktype(L, 1, LUA_TTABLE);
lua_getfield(L, -1, "imagePath");
if (!lua_isstring(L, -1)) {
error();
}
const char * imagePath = lua_tostring(L, -2);
lua_pop(L, 1);
lua_getfield(L, -1, "fuzzy");
if (!lua_isnumber(L, -1)) {
error();
}
float fuzzy = lua_tonumber(L, -2);
lua_getfield(L, -1, "ignoreColor");
if (!lua_isnumber(L, -2)) {
error();
}
float ignoreColor = lua_tonumber(L, -2);
...
return 1;
}