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- Street sign detection with
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Apporach 1
function sign_detector_basic
color = [85 255 0]./255;
%%% READ IN WHICHEVER REFERENCES YOU WOULD LIKE TO USEstop_gen_ref_2 = double(imread('ref_stop.png'));
size_gen_ref = size(stop_gen_ref_2);%%% INPUT IMAGE TO BE DETECTED
file_image = strcat('speed_limit6.jpg');sign = double(imread(file_image));
size_sign = size(sign);%%% c is the ratio of the image edges. In order to avoid distorting our
%%% image we want this ratio to stay constant as we resize the imagec = size_sign(2)/size_sign(1);
%%% This logic determines which side is smaller. The first image:reference%%% ratio we try is 2:1 where the shortest side of the image is twice the
%%% size of the reference.n1 = (size_gen_ref(2)/size_sign(2));
n2 = size_gen_ref(1)/size_sign(1);n = max(n1, n2);
max_chart = [];
max_val_plot = 0;%%% This loop finds the correlation for image:ratio sizes of n through 1
for i = n:.01:1%Resize Imageyi = size_sign(1)*i;
xi = c*yi;sign_res = imresize(sign, [yi xi]);%Call finder to determine where the point of highest correlation is and%update the vector max_chart which stores the maximum value for each
%iteration[max_val, locx, locy] = finder(sign_res, stop_gen_ref_2);max_chart = [max_chart; i max_val];%If the new max value is higher, record the sign, location, and value%of the correlation for this ratio.
if max_val>max_val_plot
max_val_plot = max_val;locx_plot = locx;
locy_plot = locy;sign_plot = sign_res;endend%Plot a figure that shows how the correlation varies as the image:reference
%ratio variesfigure
plot(max_chart(:,1), max_chart(:,2), 'color', color, 'LineWidth', 5);sign_title = strcat('Correlation as Image:Reference Ratio Varies');
title(sign_title)axis([n, 1, 0 ,1])%Plot a figure that shows where the program finds the sign at the
%image:reference ratio that gives the maximum correlationfigure
imshow(uint8(sign_plot));hold on
plot(locy_plot, locx_plot, 'bx', 'MarkerSize', 100, 'LineWidth', 3)title(strcat(file_image,' ', num2str(locx),' , ', num2str(locy)));
end%This funciton determines the maximum value of correlation and location of
%this maximum value for an inputted imag and reference.function [max_val, locx, locy] = finder(stop_image, reference)%Find the sizes of the matrices
size_image = size(stop_image);size_ref = size(reference);
%Grab first two columnssize_image = size_image(1:2);
size_ref = size_ref(1:2);%Calculate amount for zero-padding
x = size_image + size_ref - [1 1];
correlation = zeros(x(1), x(2));for k = 1:3
%Grab values for one colorstop_image_t = stop_image(:,:,k);
reference_t = reference(:,:,k);%Calculate and add the correlations for each color
correlation_int = normxcorr2(reference_t, stop_image_t);correlation = correlation + correlation_int;
endcorrelation = correlation./3;
%Determine the max valuemax_val = max(max(correlation));
%The correlation matrix is not the same size of the image becuase the size%of a signal resulting from a convolution has a size equal to the sum of
%the sizes of the two images that were convolved. Hence, need to determine%which points in the matrix correlation refer to which points in the image.
[x,y]= size(correlation);
map_refined = correlation(ceil(size_ref(1)/2):x - ceil(size_ref(1)/2), ceil(size_ref(2)/2):y - ceil(size_ref(2)/2));%Find the points of maximum correlation
[locx, locy]= find(map_refined == max_val);
end
Questions & Answers
differentiate between demand and supply
giving examples
differentiated between demand and supply using examples
Lambiv
how is the graph works?I don't fully understand
hi guys good evening to all
Lambiv
In economics, a perfect market refers to a theoretical construct where all participants have perfect information, goods are homogenous, there are no barriers to entry or exit, and prices are determined solely by supply and demand. It's an idealized model used for analysis,
Ezea
other things being equal
AI-Robot
When MP₁ becomes negative, TP start to decline.
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 •
Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of lab
Kelo
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 •
Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of labour (APL) and marginal product of labour (MPL)
Kelo
Can I ask you other question?
Shukri
What is different between quantity demand and demand?
Quantity demanded refers to the specific amount of a good or service that consumers are willing and able to purchase at a give price and within a specific time period. Demand, on the other hand, is a broader concept that encompasses the entire relationship between price and quantity demanded
Ezea
how do you save a country economic situation when it's falling apart
what is the difference between economic growth and development
Economic growth as an increase in the production and consumption of goods and services within an economy.but
Economic development as a broader concept that encompasses not only economic growth but also social & human well being.
Shukri
production function means
Jabir
What do you think is more important to focus on when considering inequality ?
any question about economics?
sir...I just want to ask one question... Define the term contract curve? if you are free please help me to find this answer 🙏
Asui
it is a curve that we get after connecting the pareto optimal combinations of two consumers after their mutually beneficial trade offs
Awais
thank you so much 👍 sir
Asui
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities, where neither p
Cornelius
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities,
Cornelius
Suppose a consumer consuming two commodities X and Y has
The following utility function u=X0.4 Y0.6. If the price of the X and Y are 2 and 3 respectively and income Constraint is birr 50.
A,Calculate quantities of x and y which maximize utility.
B,Calculate value of Lagrange multiplier.
C,Calculate quantities of X and Y consumed with a given price.
D,alculate optimum level of output .
the market for lemon has 10 potential consumers, each having an individual demand curve p=101-10Qi, where p is price in dollar's per cup and Qi is the number of cups demanded per week by the i th consumer.Find the market demand curve using algebra. Draw an individual demand curve and the market dema
suppose the production function is given by ( L, K)=L¼K¾.assuming capital is fixed find APL and MPL. consider the following short run production function:Q=6L²-0.4L³ a) find the value of L that maximizes output b)find the value of L that maximizes marginal product
Abdureman
What is the difference between perfect competition and monopolistic competition?
Mohammed
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Source:
OpenStax, Elec 301 projects fall 2011. OpenStax CNX. Jun 18, 2012 Download for free at http://cnx.org/content/col11431/1.1
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