Looping error

Here's the scenario, typical camera have vsync,href,pclk and 8-bits data.

vsync represents new frame

href represents new line

pclk represents new pixel

http://img85.imageshack.us/img85/3275/outputsignalue4.jpg

I would like to capture the first 50x50 pixels of the frame and another frame after the 60th frame.

All I need is two frames.

I'm getting this error

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Error (10519): VHDL Type or Variable Declaration error at camera.vhd(44): bounds of type or variable range must have same type

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Error (10515): VHDL type mismatch error at camera.vhd(44): integer type does not match string literal

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Here my code:

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LIBRARY ieee;

USE ieee.std_logic_1164.all;

USE ieee.numeric_std.all;

use ieee.std_logic_arith.all;

use ieee.std_logic_unsigned.all;

ENTITY camera IS

PORT

(

start : IN STD_LOGIC;

pixel : IN STD_LOGIC_VECTOR(7 DOWNTO 0);

clk : IN STD_LOGIC;

vsync : IN STD_LOGIC;

href : IN STD_LOGIC;

pclk : IN STD_LOGIC;

pixel_out : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);

reference : OUT STD_LOGIC

);

END camera;

ARCHITECTURE behave OF camera IS

SIGNAL frame_count : STD_LOGIC_VECTOR(6 DOWNTO 0);

SIGNAL line_count : STD_LOGIC_VECTOR(6 DOWNTO 0);

SIGNAL pixel_count : STD_LOGIC_VECTOR(6 DOWNTO 0);

BEGIN

PROCESS (vsync, href, pclk)

BEGIN

IF start='1' THEN--------------------------------------------STARTS THE CAPTURING SEQUENCE

frame_count <= (OTHERS => '0');

line_count <= (OTHERS => '0');

pixel_count <= (OTHERS => '0');

IF(vsync'EVENT AND vsync = '1' ) THEN

FOR frame_count IN "0000000" TO "111100" LOOP

frame_count <= frame_count + "0000001"; -------------COUNTS FRAME UNTIL 60

IF(href'EVENT AND href = '1' ) THEN

FOR line_count IN "0000000" TO "110010" LOOP

line_count <= line_count + "0000001";---------COUNTS LINE UNTIL 50

IF(pclk'EVENT AND pclk = '1' ) THEN

FOR pixel_count IN "0000000" TO "110010" LOOP

pixel_count <= pixel_count + "0000001"; --COUNTS PIXEL UNTIL 50

pixel_out<=pixel;-----------------------------OUTPUTS THE PIXEL DATA

reference<='1';------------------------------FOR SAVING THE DATA INTO RAM PURPOSES

END LOOP;

END IF;

END LOOP;

END IF;

END LOOP;

END IF;

ELSE

null;

END IF;

END PROCESS;

END behave;

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