// YOUR CODE STARTS HERE
		push ebp
		mov ebp, esp

		push ebx
		push ecx

		mov esi, image	//ESI = base address of image
		mov ebx, 0	//EBX = row index counter
		mov ecx, 0	//ECX = column index counter


		OuterLoop:	//loop through all row indexes
		cmp ebx, dim
		jae EndOuterLoop
		jmp InnerLoop

		InnerLoop:	//loop through all column indexes
		cmp ecx, dim
		jae EndInnerLoop

		//calculate offset
		mov eax, dim
		mul ebx
		add eax, ecx

		mov dl, byte ptr[esi + eax]

		cmp dl, threshold
		jae OverThreshold

		mov byte ptr[esi + eax], 0x00
		xor eax, eax
		inc ecx
		jmp InnerLoop

		OverThreshold:
		mov byte ptr[esi + eax], 0xFF
		xor eax, eax
		inc ecx
		jmp InnerLoop

		EndInnerLoop:
		xor ecx, ecx
		inc ebx
		jmp OuterLoop

		EndOuterLoop:
		pop ecx
		pop ebx


		mov esp, ebp
		pop ebp
		ret
		// YOUR CODE ENDS HERE