Question

How do I implement Image Processing using VHDL for FPGA? Please provide VHDL code

Answer 1

Image processing on FPGA using Verilog HDL:

Module for reading and processing image

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// Verilog project: Image processing in Verilog
`include "parameter.v" // Include definition file 
module image_read #( parameter 
                 WIDTH = 768, // Image width 
                 HEIGHT = 512, // Image height 
                 INFILE = "./img/your_image.hex", // image file     
                 START_UP_DELAY = 100, //Delay during start up time 
                 HSYNC_DELAY = 160, // Delay between 
                 HSYNC pulses 
                 VALUE= 100, // value for Brightness operation 
                 THRESHOLD= 90, 
           // Threshold value for Threshold and contrast operation 
                ValueToMul=2, 
                ValueToAdd= 10, 
// Value to add in contrast addition 
                ValueToSubtract= 15 , 
// Value to add in contrast addition 
               SIGN=1 // Sign value using for brightness operation
              // SIGN = 0: Brightness subtraction 
// SIGN = 1: Brightness addition 
) 
( input HCLK, // clock 
input HRESETn, // Reset (active low) 
output reg VSYNC, // Vertical synchronous pulse 
// This signal is often a way to indicate that one entire image is transmitted. 
// Just create and is not used, will be used once a video or many images are transmitted. 
output reg HSYNC, 
// Horizontal synchronous pulse 
// An HSYNC indicates that one line of the image is transmitted. 
//Used to be a horizontal synchronous signals for writing bmp file. 
output reg [7:0] DATA_R0, // 8 bit Red data (even) 
output reg [7:0] DATA_G0, // 8 bit Green data (even)
 output reg [7:0] DATA_B0, // 8 bit Blue data (even) 
output reg [7:0] DATA_R1, // 8 bit Red data (odd) 
output reg [7:0] DATA_G1, // 8 bit Green data (odd) 
output reg [7:0] DATA_B1, // 8 bit Blue data (odd) 
output ctrl_done // Done flag 
);
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//-------------------------------------------------//
// -------- Reading data from input file ----------//
//-------------------------------------------------//
initial begin
    $readmemh(INFILE,total_memory,0,sizeOfLengthReal-1); // read file from INFILE
end

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