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    • MeanFilter

    Modified by 2015.06.01

    Design

    MeanFilter

    Version
    1.0

    Modified
    2015-05-20

    Source

    MeanFilter

    IP-GUI

    MeanFilter IP-GUI

    Function

    Local filter - Mean filter, it always used for smoothing images.
    It will give the first output after sum_stage + 1 cycles while the input enable.

    Files

    Name Function
    MeanFilter.v Main module
    MeanFilter_TB.sv Test bench

    Parameters

    Name Type Range Default Description
    work_mode unsigned 0 for Pipeline, 1 for Req-ack 0 This module's working mode.
    window_width unsigned 2 - 15 3 The width(and height) of window.
    color_width unsigned 1 - 12 8 Color's bit wide.
    sum_stage unsigned Depend on width of window, log2(window_width^2) 3 Stage of sum.

    Ports

    Name Port Type Range Default Description
    clk input unsigned None None Clock.
    rst_n input unsigned None None Reset, active low.
    in_enable input unsigned None None Input data enable, in pipeline mode, it works as another rst_n, in req-ack mode, only it is high will in_data can be really changes.
    in_data input unsigned color_width * window_width * window_width - 1 : 0 None Input data, it must be synchronous with in_enable.
    out_ready output unsigned None None Output data ready, in both two mode, it will be high while the out_data can be read.
    out_data output unsigned color_width - 1 : 0 None Output data, it will be synchronous with out_ready.

    Simulations

    Simulations for this module just support Gray-scale images !

    Waves

    Pipeline mode

    Pipeline mode

    ReqAck mode

    ReqAck mode

    Original

    Original

    Results

    Results
    HDL functional simulation for pipeline mode is on the left, for req-ack mode is on the middle, and which on the right is the soft simulation

    Results
    Test for 3x3 window

    Results
    Test for 5x5 window

    PSNR

    1-3 1-5 2-3 2-5 Total
    1000000.00 1000000.00 1000000.00 1000000.00 1000000.00

    Utilization

    For 3x3 window.

    Slice LUTs* Slice Registers
    38 17

    Timing

    For 3x3 window.

    The max Data Path Delay is 2.085ns, so:

    FMax = 479.61MHz

    Thanks

    The sources of images for simulations:
    おにねこ-クロス.ホエン
    月岡月穂-春爛漫