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The problem you are having is not in the code in the first post - that code compiles fine (with some length missmatch warnings).
Please post the code you are working with now as it is clearly not the code in the first post.
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the code is this:
library IEEE;
--use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_signed.ALL;
use IEEE.STD_LOGIC_TEXTIO.ALL;
--use ieee.numeric_std.all;
--package image_array_2 is
-- type image_array is array(0 to 49, 0 to 49) of unsigned(7 downto 0);
--type image_derivadas is array(0 to 49, 0 to 49) of unsigned (8 downto 0);
--end package image_array_2;
use work.imagens.all;
entity stage_1 is
Port (
clk : in bit;
imagem: in image_array;
imagemanterior: in image_array;
Ix: out image_derivadas;
Iy: out image_derivadas;
It: out image_derivadas
);
end stage_1;
architecture Behavioral of stage_1 is
begin
process (clk)
begin
If (clk 'event and clk = '1') then
for x in imagem'range(1) loop
for y in imagem'range(2) loop
Ix(x,y) <= ((imagemanterior(x,y+1) - imagemanterior(x,y) + imagemanterior (x+1,y+1) - imagemanterior(x+1,y) + imagem(x,y+1) - imagem(x,y)+imagem(x+1,y+1)-imagem(x,y+1)))/4;
Iy(x,y) <= ((imagemanterior(x+1,y) - imagemanterior(x,y) + imagemanterior(x+1,y+1) - imagemanterior(x,y+1) + imagem(x+1,y) - imagem(x,y) + imagem(x+1,y+1) -imagem(x,y+1)))/4;
It(x,y) <= (imagem(x,y) - imagemanterior(x,y) + imagem(x+1,y)- imagemanterior(x+1,y) +imagem(x,y+1)- imagemanterior(x,y+1) + imagem(x+1,y+1)- imagemanterior(x+1,y+1))/4;
end loop;
end loop;
end if ;
end process;
end Behavioral;
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