Compare `Mat` from disk to memory

C++
,
6

So my “observation” was correct. there is information loss
I have implemented the changes to PNG, and it’s working as expected.

test_extract_object.cpp:

bool is_mat_eq(image &im1, image &im2) {
    cv::Mat diff;
    cv::absdiff(im1, im2, diff);
    bool eq = cv::countNonZero(diff) == 0;
    return eq;
}

TEST_P(ExtractObjectFixture, ExtractsObjectCorrectly) {
    ExtractObjectSample sample = GetParam();
    auto imageUtils = this->getInjector()->get<ImageUtils *>();


    std::optional<image> resultObject = imageUtils->extract_object(imageUtils->read(sample.mainImage));

    ASSERT_TRUE(resultObject);

    image object = *resultObject;
    image sample_object = imageUtils->read(sample.object);
    image fake_object = imageUtils->read(sample.fake_object);

    EXPECT_EQ(object.rows, sample_object.rows);
    EXPECT_EQ(object.cols, sample_object.cols);

    bool eq = is_mat_eq(object, sample_object);
    EXPECT_TRUE(eq);

    eq = is_mat_eq(sample_object, fake_object);
    EXPECT_FALSE(eq);

    eq = is_mat_eq(object, fake_object);
    EXPECT_FALSE(eq);
}